JP3298246B2 - Video signal processing device and video signal processing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal processing apparatus and a video signal processing method for a color video camera.

[0002]

2. Description of the Related Art FIG. 22 is a block circuit diagram showing a conventional video signal processing device. In the figure, 23, 24, 25
Is a gain control circuit.

Next, the operation will be described. The gain control circuits 23 and 24 control the gain of the RY color difference signal and the BY color difference signal by the control signals KR and KB in order to perform appropriate color reproduction. The gain control circuit 25 controls the gain of the luminance signal Y in accordance with the control signal KY.

[0004]

Since the conventional video signal processing apparatus is configured as described above, the hue is RY
There is a problem that only the gains of the axis and the BY axis can be changed, and correction of a specific color affects other colors.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can accurately detect a specific color and quantitatively detect whether a detected color is a specific color. Signal processing device and image signal that realizes a good image color-corrected by a natural change in which only a specific color region is inconspicuous without influencing the boundary with a simple circuit configuration at a low cost
The purpose is to obtain a signal processing method .

[0006]

According to a first aspect of the present invention, there is provided a video signal processing apparatus for processing a video signal including a luminance signal, a first color difference signal, and a second color difference signal. within the hue range of the specific color having a saturation determined from the first color difference signal and the second color difference signal, look the <br/> a hue range of a specific color having a value which can be distinguished from the saturation and up tables, the first color difference signal Oyo
Hue representative of said video signal, it is determined whether or not the hue range of the specific color by inputting the fine said second color difference signal to the look-up table, if the hue range of the specific color, further Compare the saturation and the luminance signal
The saturation of the color represented by the video signal is
And means for determining whether the saturation range of Teiiro, if the color of the hue range and saturation range of the specific color, the movies
Comparison means for outputting a detection signal indicating that the colors represented by the image signal is in the region of the specific color, the a pre-Symbol saturation and representative value of saturation range of the specific color, the saturation the specific color for larger than the representative value of the saturation range, and outputs the difference between the upper limit and the saturation saturation range of the specific color, smaller than the saturation representative value of saturation range of the specific color If, you; and a means for outputting a difference between a lower limit of the saturation range of the specific color and the saturation. Claim
The video signal processing device according to the second aspect of the present invention includes a luminance signal and a first signal.
Processing a video signal including a color difference signal and a second color difference signal
In the video signal processing device, within the hue range of a specific color,
The saturation determined from the first color difference signal and the second color difference signal.
Having a degree of saturation, and the degree of saturation is outside the hue range of the specific color.
A look-up table having a distinguishable value;
The first color difference signal and the second color difference signal
The input of the video table allows the
Determine whether the hue is within the hue range of the specific color,
Within the hue range of the specific color, the saturation degree and the
The color represented by the video signal is compared with a luminance signal.
To determine whether the saturation of the color is within the saturation range of the specific color.
Means and a color within a hue range and a saturation range of the specific color
If the color represented by the video signal is the area of the specific color
Means for outputting a detection signal indicating that the
Comparing with the representative value of the saturation range of the specific color,
Is larger than the representative value of the saturation range of the specific color,
The difference between the saturation and the upper limit value of the saturation range of the Patent Teiiro
Sliced and output, the saturation is the saturation of the specific color
If less than the representative value of the range, the saturation and the specific
Slice and output the difference from the lower limit of the color saturation range
Means.

A video signal processing apparatus according to a third aspect of the present invention.
Includes a luminance signal, a first chrominance signal, and a second chrominance signal.
Video signal processing equipment that processes video signals
Within the hue range of the color, the first color difference signal and the second
It has a saturation determined from the color difference signal, and has a hue range of the specific color.
Outside the box, look-ups with values that can be distinguished from the saturation
Table, the first color difference signal and the second color
By inputting the difference signal to the look-up table,
Hue representing the video signal is within the hue range of the specific color.
And if it is within the hue range of the specific color,
Furthermore, by comparing the saturation degree and the luminance signal,
The saturation of the color represented by the video signal is within the saturation range of the specific color.
Means for determining whether or not the color is within the range;
And if the color is within the saturation range, it represents the video signal.
A means for outputting a detection signal indicating that the color is in the specific color area
And a representative value of the saturation and the saturation range of the specific color.
And the saturation is representative of the saturation range of the specific color.
If it is larger than the value, the upper limit of the saturation range of the specific color
Nonlinearly transforms the difference between
If the degree is smaller than the representative value of the saturation range of the specific color,
The saturation and the lower limit of the saturation range of the specific color.
Means for nonlinearly converting and outputting the difference.
And The video signal processing device according to claim 4 is
Video including degree signal, first color difference signal, and second color difference signal
In a video signal processing device that processes signals, a specific color
Within the phase range, the first color difference signal and the second color difference signal
Has a saturation degree determined from the number, and is out of the hue range of the specific color.
Is a lookup table with a value that can be distinguished from the saturation.
And the first color difference signal and the second color difference signal
By inputting into the lookup table
Whether the hue represented by the video signal is within the hue range of the specific color
Is determined, and within the hue range of the specific color,
By comparing the saturation signal with the luminance signal,
Whether the saturation of the color represented by the image signal is within the saturation range of the specific color
Means for determining whether or not the specific color is within the hue range and
If the color is within the union range, the color represented by the video signal is
Means for outputting a detection signal indicating that it is in the specific color area;
Compare the saturation with a representative value of the saturation range of the specific color
And the saturation is greater than a representative value of the saturation range of the specific color.
Again large, the upper limit value of the saturation range of the Patent Teiiro
Use a low-pass filter or band-pass filter
Filter, and the saturation is the saturation of the specific color.
If it is smaller than the representative value of the saturation range, the saturation and the characteristic
The difference between the constant color saturation range and the lower limit is
Or means for outputting through a band-pass filter.
It is characterized by doing.

A video signal processing apparatus according to a fifth aspect of the present invention.
Includes a luminance signal, a first chrominance signal, and a second chrominance signal.
A video signal processing device for processing video signals,
A first method of adding / subtracting a first color difference signal to / from the second color difference signal;
Calculating means for converting the first color difference signal to the second color difference signal
First gain control means for controlling the amount of addition / subtraction to the
A second act of adding and subtracting the second color difference signal to and from the first color difference signal
Calculating means, and converting the second color difference signal into the first color difference signal.
Second gain control means for controlling the amount of addition and subtraction;
Within the hue range, the first color difference signal and the second color difference
Has a saturation level determined from the signal and is out of the hue range of the specific color
Is a look-up table with a value that can be distinguished from the saturation.
Table, the first color difference signal and the second color difference signal.
By entering the look-up table, the
Determines whether the hue represented by the image signal is within the hue range of the specific color.
Discriminating, if within the hue range of the specific color, further
By comparing the degree of saturation with the luminance signal,
Whether the saturation of the color represented by the signal is within the saturation range of the specific color
Means for determining whether the color is within the hue range of the specific color and is saturated.
Color within the degree range, the color represented by the video signal is
Means for outputting a detection signal indicating that the image is in a specific color area;
Compare the saturation with the representative value of the saturation range of the specific color
And the saturation is greater than a representative value of the saturation range of the specific color.
Is larger than the upper limit of the saturation range of the specific color and the
The difference from the saturation is output as a correction amount, and the saturation is
If the saturation is smaller than the representative value of the saturation range of the specific color,
The difference between the sum and the lower limit of the saturation range of the specific color is the correction amount.
And outputs the first gain according to the magnitude of the correction amount.
Controlling the control means and the second gain control means independently of each other.
Controlling the representation of the video signal in the specific color region.
Means for performing color correction on the color.
I do. The video signal processing device according to the invention of claim 6 is characterized in that
Video signal including a signal, a first color difference signal, and a second color difference signal
In the video signal processing apparatus for processing the first color, the first color
First arithmetic means for adding / subtracting a difference signal to / from the second color difference signal
Adding and subtracting the first color difference signal to and from the second color difference signal
First gain control means for controlling the amount of color difference, and the second color difference
Second arithmetic means for adding / subtracting a signal to / from the first color difference signal
Adding and subtracting the second color difference signal to and from the first color difference signal
A second gain control means for controlling the amount of the hue range of JP Teiiro
In the box, the first color difference signal and the second color difference signal
The saturation has a predetermined degree, and is outside the hue range of the specific color.
Look-up table having a value distinguishable from the saturation
And the first color difference signal and the second color difference signal
The video signal is input to the backup table
Determines whether the hue represented by is within the hue range of the specific color
If the specific color is within the hue range, the saturation is further increased.
The video signal is obtained by comparing the brightness signal with the luminance signal.
Whether the saturation of the color represented by is within the saturation range of the specific color.
Means for judging, and a hue range and a saturation range of the specific color.
If the color is within the box, the color represented by the video signal is
Means for outputting a detection signal indicating that the image is in the color area;
Comparing the sum with the representative value of the saturation range of the specific color,
The saturation is larger than the representative value of the saturation range of the specific color.
The upper limit of the saturation range of the specific color and the saturation
Is output as a correction amount, and the degree of saturation is
If less than the representative value of the saturation range, the saturation and
The difference from the lower limit of the saturation range of the specific color is used as a correction amount.
Output the correction amount according to the size of the sliced output.
The first gain control means and the second gain control means
The images in the specific color area are controlled independently of each other.
Means for performing color correction on the color represented by the signal
It is characterized by the following.

A video signal processing apparatus according to a seventh aspect of the present invention.
Includes a luminance signal, a first chrominance signal, and a second chrominance signal.
A video signal processing device for processing video signals,
A first method of adding / subtracting a first color difference signal to / from the second color difference signal;
Calculating means for converting the first color difference signal to the second color difference signal
First gain control means for controlling the amount of addition / subtraction to the
A second act of adding and subtracting the second color difference signal to and from the first color difference signal
Calculating means, and converting the second color difference signal into the first color difference signal.
Second gain control means for controlling the amount of addition and subtraction;
Within the hue range, the first color difference signal and the second color difference
Has a saturation level determined from the signal and is out of the hue range of the specific color
Is a look-up table with a value that can be distinguished from the saturation.
Table, the first color difference signal and the second color difference signal.
By entering the look-up table, the
Determines whether the hue represented by the image signal is within the hue range of the specific color.
Discriminating, if within the hue range of the specific color, further
By comparing the degree of saturation with the luminance signal,
Whether the saturation of the color represented by the signal is within the saturation range of the specific color
Means for determining whether the color is within the hue range of the specific color and is saturated.
Color within the degree range, the color represented by the video signal is
Means for outputting a detection signal indicating that the image is in a specific color area;
Compare the saturation with the representative value of the saturation range of the specific color
And the saturation is greater than a representative value of the saturation range of the specific color.
Is larger than the upper limit of the saturation range of the specific color and the
The difference from the saturation is output as a correction amount, and the saturation is
If the saturation is smaller than the representative value of the saturation range of the specific color,
The difference between the sum and the lower limit of the saturation range of the specific color is the correction amount.
And the magnitude of the output obtained by nonlinearly converting the correction amount
The first gain control means and the second gain control means
The steps are controlled independently of each other in the specific color area.
Means for performing color correction on the color represented by the video signal;
It is characterized by having. The video according to the invention of claim 8
The signal processing device includes a luminance signal, a first color difference signal, and a second color signal.
Video signal processing device that processes video signals including difference signals
The first color difference signal is added to the second color difference signal.
First arithmetic means for subtracting, and the first color difference signal
A first gain control means for controlling the amount of addition / subtraction to the second color difference signal
And adjusting the second color difference signal to the first color difference signal.
A second calculating means for calculating the second color difference signal,
Gain control means for controlling the amount of addition / subtraction to the color difference signal
If, within a hue range of JP Teiiro the first color difference signal and before
The specific color having a saturation determined from the second color difference signal;
Outside the hue range of
Backup table, the first color difference signal and the second color difference signal.
Inputting the color difference signal of
The hue represented by the video signal is
It is determined whether or not it is within the range, and if it is within the hue range of the specific color,
Comparing the saturation signal with the luminance signal.
The saturation of the color represented by the video signal is
Means for determining whether or not the specific color is within the range, and the hue of the specific color
If the color is within the range and within the saturation range, the video signal
Outputs a detection signal indicating that the color to be displayed is in the specific color area
Means for determining the saturation and the saturation range of the specific color.
By comparing with a table value, the saturation is the saturation range of the specific color.
Is larger than the representative value of the saturation range of the specific color.
The difference between the upper limit and the saturation is output as a correction amount, and
The saturation is smaller than the representative value of the saturation range of the specific color.
In the case, the saturation and the lower limit of the saturation range of the specific color
Is output as a correction amount, and the correction amount is passed through a filter.
The first gain control means and the
Controlling the second gain control means independently of each other,
Color correction for the color represented by the video signal in the area
Means for performing the following.

A video signal processing apparatus according to a ninth aspect of the present invention.
Is provided in the video signal processing device according to claims 1 to 8.
The contents of the look-up table are stored in the first color difference signal and the second color difference signal.
Within the hue range of a specific color to the saturation determined by the color difference signal of
A hue range identification flag for distinguishing whether the
The first color difference signal and the second color difference signal are
If it is within the hue range of the specific color, the m-bit
1 color difference signal and m bits of the second color difference signal.
N bits for each digit are entered in the lookup table.
Output the output from the lookup table
The value obtained by increasing the value by mn bits is referred to as the first saturation.
And the lower mn bits of the first color difference signal.
And the lower mn bits of the second color difference signal.
The second saturation obtained by inputting to the look-up table
The sum of the sums and the first saturation is calculated as the first color difference.
Signal and the second color difference signal.
It is characterized by having been constituted as follows. According to the invention of claim 10
The video signal processing apparatus according to claim 1, wherein
The contents of the look-up table provided in the
Specific to the saturation determined from the color difference signal and the second color difference signal
Hue range identification that distinguishes between the color hue range and the hue range
A flag is added, and the first color difference signal and the
If the second color difference signal is within the hue range of the specific color,
The m-bit first color difference signal and the m-bit
Each of the upper n bits of the second color difference signal is
To the lookup table
The output value output from the
The first color difference signal.
And the lower mn bits of the second color difference signal.
Comparing with n bits by a comparator,
1 is added to the first color difference signal and
The saturation is determined from the second color difference signal.
It is characterized by the following.

[0011] A video signal processing method according to the present invention.
Includes a luminance signal, a first chrominance signal, and a second chrominance signal.
Video signal processing method for processing video signals
Within the hue range of the color, the first color difference signal and the second
It has a saturation determined from the color difference signal, and has a hue range of the specific color.
Outside the box, look-ups with values that can be distinguished from the saturation
The first color difference signal and the second color difference
By inputting a signal, the hue represented by the video signal
Determining whether or not is within the hue range of the specific color
And within the hue range of the specific color, the saturation
The video signal is obtained by comparing the brightness signal with the luminance signal.
Whether the saturation of the color represented by is within the saturation range of the specific color.
Discriminating, and within the hue range and saturation of the specific color
Color within the degree range, the color represented by the video signal is
Outputting a detection signal indicating that the pixel is in a specific color area
And the saturation and a representative value of the saturation range of the specific color.
Compare, the saturation is a representative value of the saturation range of the specific color
Is larger than the upper limit of the saturation range of the specific color and
The difference between the specific color and the saturation is output.
If less than the representative value of the saturation range, the saturation and the previous
Step to output the difference from the lower limit of the saturation range of the specific color
And a pump. According to the invention of claim 12
The video signal processing method includes a luminance signal, a first color difference signal, and a second color difference signal.
Video signal processing method for processing video signals including color difference signals
The first color difference signal within a hue range of a specific color.
And a saturation determined from the second color difference signal,
Outside the hue range of the specific color, a value that can be distinguished from the saturation
The first color difference signal and the
Inputting the second color difference signal and the second color difference signal,
Determines whether the hue represented by the signal is within the hue range of the specific color.
Differentiating, if within the hue range of the specific color,
Further, by comparing the saturation with the luminance signal,
The saturation of the color represented by the video signal is the saturation of the specific color.
Determining whether the color is within the range; and determining the hue of the specific color.
If the color is within the range and within the saturation range, the video signal
Outputs a detection signal indicating that the color to be displayed is in the specific color area
And the saturation and the saturation range of the specific color.
And the saturation is determined to be the saturation of the specific color.
If it is larger than the representative value of the range, the saturation range of the specific color
Slice and output the difference between the upper limit of the box and the saturation
And a step in which the degree of saturation corresponds to the degree of saturation of the specific color.
If less than the table value, the saturation and the saturation of the specific color
For slicing and outputting the difference from the lower limit of the degree range
And characterized in that:

A video signal processing method according to a thirteenth aspect of the present invention.
Includes a luminance signal, a first chrominance signal, and a second chrominance signal.
Video signal processing method for processing video signals
Within the hue range of the color, the first color difference signal and the second
It has a saturation determined from the color difference signal, and has a hue range of the specific color.
Outside the box, look-ups with values that can be distinguished from the saturation
The first color difference signal and the second color difference
By inputting a signal, the hue represented by the video signal
Determining whether or not is within the hue range of the specific color
And within the hue range of the specific color, the saturation
The video signal is obtained by comparing the brightness signal with the luminance signal.
Whether the saturation of the color represented by is within the saturation range of the specific color.
Discriminating, and within the hue range and saturation of the specific color
Color within the degree range, the color represented by the video signal is
Outputting a detection signal indicating that the pixel is in a specific color area
And the saturation and a representative value of the saturation range of the specific color.
Compare, the saturation is a representative value of the saturation range of the specific color
Is larger than the upper limit of the saturation range of the specific color and
The difference from the saturation is nonlinearly converted and output.
Is smaller than the representative value of the saturation range of the specific color,
The difference between the saturation and the lower limit of the saturation range of the specific color
And outputting a non-linear conversion.
I do. The video signal processing method according to claim 14 is
Video including degree signal, first color difference signal, and second color difference signal
In a video signal processing method for processing a signal, a specific color
Within the phase range, the first color difference signal and the second color difference signal
Has a saturation degree determined from the number, and is out of the hue range of the specific color.
Is a lookup table with a value that can be distinguished from the saturation.
The first color difference signal and the second color difference signal
By inputting, the hue represented by the video signal is
Determining whether the color is within the hue range of the specific color;
Within the hue range of the specific color, the saturation degree and the
The color represented by the video signal is compared with a luminance signal.
To determine whether the saturation of the color is within the saturation range of the specific color.
Step and within the hue range and saturation range of the specific color
If the color represented by the video signal is
Outputting a detection signal indicating that the image is in the area;
Comparing the sum with the representative value of the saturation range of the specific color,
The saturation is larger than the representative value of the saturation range of the specific color.
The upper limit of the saturation range of the specific color and the saturation
Low-pass filter or band-pass filter
And the saturation is in the saturation range of the specific color.
Is smaller than the representative value, the saturation and the specific color
The difference from the lower limit of the saturation range is
Outputting through a band-pass filter.
It is characterized by the following.

A video signal processing method according to a fifteenth aspect of the present invention.
Includes a luminance signal, a first chrominance signal, and a second chrominance signal.
A video signal processing method for processing a video signal,
When adding / subtracting the first color difference signal to / from the second color difference signal
Adding and subtracting the first color difference signal to and from the second color difference signal
A first gain control step of controlling a first amount to perform;
When adding / subtracting a second color difference signal to / from the first color difference signal
Adding and subtracting the second color difference signal to and from the first color difference signal
A second gain control step of controlling a second amount to perform
Within the hue range of the color, the first color difference signal and the second
It has a saturation determined from the color difference signal, and has a hue range of the specific color.
Outside the box, look-ups with values that can be distinguished from the saturation
The first color difference signal and the second color difference signal
, The hue represented by the video signal is
Determining whether the color is within the hue range of the specific color;
Within the hue range of the specific color, the saturation and the previous
The video signal is represented by comparing with the luminance signal.
Determining whether the color saturation is within the saturation range of the specific color
And a hue range and a saturation range of the specific color.
If the color is within, the color represented by the video signal is the specific color
Outputting a detection signal indicating that it is in the area of
Comparing the saturation with a representative value of the saturation range of the specific color,
The saturation is larger than a representative value of the saturation range of the specific color.
The maximum value of the saturation range of the specific color and the saturation.
The degree of saturation is output as a correction amount, and the degree of saturation is
If less than the representative value of the color saturation range, the saturation
And the difference between the lower limit value of the saturation range of the specific color as the correction amount.
And outputting according to the magnitude of the correction amount.
The first amount and the first amount in the first gain control step;
Each of the second quantities in the second gain control step is
Independently controlling the video signal in the specific color area
Performing a color correction for the color represented by
And features. Video signal processing according to claim 16
The method includes the steps of combining a luminance signal, a first color difference signal, and a second color difference signal.
In a video signal processing method for processing a video signal including
The first color difference signal is added to or subtracted from the second color difference signal.
In this case, the first color difference signal is added to or subtracted from the second color difference signal.
A first gain control step of controlling a first amount to be calculated;
When adding or subtracting the second color difference signal from the first color difference signal
Adding and subtracting the second color difference signal to and from the first color difference signal
A second gain control step of controlling a second amount to perform
Within the hue range of the color, the first color difference signal and the second
It has a saturation determined from the color difference signal, and has a hue range of the specific color.
Outside the box, look-ups with values that can be distinguished from the saturation
The first color difference signal and the second color difference signal
, The hue represented by the video signal is
Determining whether the color is within the hue range of the specific color;
Within the hue range of the specific color, the saturation and the previous
The video signal is represented by comparing with the luminance signal.
Determining whether the color saturation is within the saturation range of the specific color
And a hue range and a saturation range of the specific color.
If the color is within, the color represented by the video signal is the specific color
Outputting a detection signal indicating that it is in the area of
Comparing the saturation with a representative value of the saturation range of the specific color,
The saturation is larger than a representative value of the saturation range of the specific color.
The maximum value of the saturation range of the specific color and the saturation.
The degree of saturation is output as a correction amount, and the degree of saturation is
If less than the representative value of the color saturation range, the saturation
And the difference between the lower limit value of the saturation range of the specific color as the correction amount.
Outputting the correction amount and slicing the correction amount.
Before the first gain control step according to the magnitude of
The first amount and the second gain control step;
The second amounts are controlled independently of each other to obtain the specific color area.
Color correction for the color represented by the video signal
And a step.

A video signal processing method according to a seventeenth aspect of the present invention.
Includes a luminance signal, a first chrominance signal, and a second chrominance signal.
A video signal processing method for processing a video signal,
When adding / subtracting the first color difference signal to / from the second color difference signal
Adding and subtracting the first color difference signal to and from the second color difference signal
A first gain control step of controlling a first amount to perform;
When adding / subtracting a second color difference signal to / from the first color difference signal
Adding and subtracting the second color difference signal to and from the first color difference signal
A second gain control step of controlling a second amount to perform
Within the hue range of the color, the first color difference signal and the second
It has a saturation determined from the color difference signal, and has a hue range of the specific color.
Outside the box, look-ups with values that can be distinguished from the saturation
The first color difference signal and the second color difference signal
, The hue represented by the video signal is
Determining whether the color is within the hue range of the specific color;
Within the hue range of the specific color, the saturation and the previous
The video signal is represented by comparing with the luminance signal.
Determining whether the color saturation is within the saturation range of the specific color
And a hue range and a saturation range of the specific color.
If the color is within, the color represented by the video signal is the specific color
Outputting a detection signal indicating that it is in the area of
Comparing the saturation with a representative value of the saturation range of the specific color,
The saturation is larger than a representative value of the saturation range of the specific color.
The maximum value of the saturation range of the specific color and the saturation.
The degree of saturation is output as a correction amount, and the degree of saturation is
If less than the representative value of the color saturation range, the saturation
And the difference between the lower limit value of the saturation range of the specific color as the correction amount.
Outputting the correction amount, and outputting the non-linearly converted correction amount.
In the first gain control step according to the magnitude of the force
Before the first amount and the second gain control step
The second amount is independently controlled to control the specific color area.
Color correction for the color represented by the video signal at
And the following steps. Claim 18
The video signal processing method according to the present invention comprises a luminance signal and a first chrominance signal.
Signal for processing a video signal including a signal and a second color difference signal
In the signal processing method, the first color difference signal is converted to the second color difference signal.
When the first color difference signal is added to or subtracted from the color difference signal, the first color difference signal is
A first control for controlling a first amount to be added to or subtracted from the second color difference signal;
Obtaining the second color difference signal with the first color difference signal.
The second color difference signal is added to and subtracted from the difference signal .
A second gain for controlling a second amount to be added to or subtracted from the color difference signal of 1
Controlling the first color within a hue range of a specific color;
Having a degree of saturation determined from the difference signal and the second color difference signal.
However, it can be distinguished from the saturation outside the hue range of the specific color.
The first color difference signal in a look-up table having
Signal and the second color difference signal
Determines whether the hue represented by the signal is within the hue range of the specific color.
Differentiating, if within the hue range of the specific color,
Further, by comparing the saturation with the luminance signal,
The saturation of the color represented by the video signal is the saturation of the specific color.
Determining whether the color is within the range; and determining the hue of the specific color.
If the color is within the range and within the saturation range, the video signal
Outputs a detection signal indicating that the color to be displayed is in the specific color area
And the saturation and the saturation range of the specific color.
And the saturation is determined to be the saturation of the specific color.
If it is larger than the representative value of the range, the saturation range of the specific color
The difference between the upper limit of the box and the saturation is output as a correction amount,
The saturation is smaller than a representative value of a saturation range of the specific color.
The saturation and the lower limit of the saturation range of the specific color.
Outputting a difference from the value as a correction amount;
The first benefit is determined according to the magnitude of the output through which the
The first amount and the second gain in the gain control step
The second amounts in the control step are independently controlled.
Controlling the representation of the video signal in the specific color region.
Performing a color correction on the color.
And

A video signal processing method according to the nineteenth aspect.
Is the video signal processing method according to claims 11 to 18.
The contents of the look-up table are the first color difference signal and the second color difference signal.
Within the hue range of a specific color to the saturation determined by the color difference signal of
A hue range identification flag for distinguishing whether the
Wherein the first color difference signal and the second color difference signal
If the signal is within the hue range of the specific color,
The first color difference signal and the m-bit second color difference signal
The upper n bits are respectively stored in the look-up table.
And output from the lookup table
Output value increased by mn bits for first saturation
And a step of determining the first color difference signal
Mn bits and the lower mn bits of the second color difference signal.
Input into the lookup table.
Obtained by adding the second saturation obtained by the above to the first saturation
From the first color difference signal and the second color difference signal.
And setting the saturation degree. Contract
The video signal processing method according to the invention of claim 20 is characterized in that:
Lookup Tes in the Video Signal Processing Methods 11 to 18
The contents of the table are obtained from the first color difference signal and the second color difference signal.
Whether the color is within the hue range or outside the hue range of a specific color
Hue range identification flag
The first color difference signal and the second color difference signal correspond to the specific color.
M, the first color difference signal of m bits
Signal and m high-order n bits of the second color difference signal
Minutes into the lookup table,
The output value output from the look-up table is mn
The step that is increased by the number of bits is set as the first saturation.
And the lower mn bits of the first color difference signal.
And the lower mn bits of the second color difference signal.
The larger one was added to the first degree of saturation as compared by the filter.
From the first color difference signal and the second color difference signal
It is characterized by including a step of setting the degree of saturation to be determined.

[0016]

The video signal processing according to the first and eleventh aspects of the present invention.
The apparatus and the video signal processing method comprise: a luminance signal and a first color difference;
When processing a video signal containing a second signal and a second color difference signal.
However, within the hue range of the specific color, the first color difference signal
The specific color having a saturation determined from the second color difference signal;
Outside the hue range of
The first color difference signal and the second color difference signal are stored in a backup table.
2 by inputting the color difference signal of
Determining whether the hue to be passed is within the hue range of the specific color,
Within the hue range of the specific color, the saturation and the previous
The video signal is represented by comparing with the luminance signal.
Determines whether the color saturation is within the saturation range of the specific color
A color within the hue range and the saturation range of the specific color.
Then, the color represented by the video signal is in the specific color area.
And outputs a detection signal indicating the saturation and the saturation of the specific color.
The saturation is compared with a representative value of the sum degree range, and the saturation is determined by the specific color.
Is larger than the representative value of the saturation range of the specific color,
Outputting the difference between the upper limit of the saturation range and the saturation,
The saturation is smaller than the representative value of the saturation range of the specific color.
In the case, the saturation and the lower limit of the saturation range of the specific color
Outputs the difference between

A video signal according to the second and twelfth aspects of the present invention.
The processing device and the video signal processing method are provided with a luminance signal and a first signal.
Processing a video signal including a color difference signal and a second color difference signal
At this time, within the hue range of the specific color, the first color difference signal and
And a degree of saturation determined from the second color difference signal.
Outside the hue range of the constant color, it has a value that can be distinguished from the saturation
The first color difference signal and the previous
The video signal is input by inputting the second color difference signal.
Determines whether the hue represented by is within the hue range of the specific color
If the specific color is within the hue range, the saturation is further increased.
The video signal is obtained by comparing the brightness signal with the luminance signal.
Whether the saturation of the color represented by is within the saturation range of the specific color.
Discriminating the color within the hue range and the saturation range of the specific color
If the color represented by the video signal is the area of the specific color
Is output, and the saturation and the specific color are output.
Is compared with a representative value of the saturation range of
If it is larger than the representative value of the saturation range of the fixed color,
Slice the difference between the upper limit of the color saturation range and the saturation
And outputting the image data, and the saturation level indicates the saturation of the specific color.
If less than the representative value of the sum range, the saturation and the saturation
Slice the difference between the lower limit of the saturation range of a specific color and output
I do.

A video signal according to the third and thirteenth aspects of the present invention.
The processing device and the video signal processing method are provided with a luminance signal and a first signal.
Processing a video signal including a color difference signal and a second color difference signal
At this time, within the hue range of the specific color, the first color difference signal and
And a degree of saturation determined from the second color difference signal.
Outside the hue range of the constant color, it has a value that can be distinguished from the saturation
The first color difference signal and the previous
The video signal is input by inputting the second color difference signal.
Determines whether the hue represented by is within the hue range of the specific color
If the specific color is within the hue range, the saturation is further increased.
The video signal is obtained by comparing the brightness signal with the luminance signal.
Whether the saturation of the color represented by is within the saturation range of the specific color.
Discriminating the color within the hue range and the saturation range of the specific color
If the color represented by the video signal is the area of the specific color
Is output, and the saturation and the specific color are output.
Is compared with a representative value of the saturation range of
If it is larger than the representative value of the saturation range of the fixed color,
The difference between the upper limit value of the color saturation range and the saturation is nonlinearly changed.
And outputs the saturation, and the saturation is within the saturation range of the specific color.
If less than the representative value, the saturation and the saturation of the specific color
The difference from the lower limit of the sum range is nonlinearly converted and output.

A video signal according to the present invention.
The processing device and the video signal processing method are provided with a luminance signal and a first signal.
Processing a video signal including a color difference signal and a second color difference signal
At this time, within the hue range of the specific color, the first color difference signal and
And a degree of saturation determined from the second color difference signal.
Outside the hue range of the constant color, it has a value that can be distinguished from the saturation
The first color difference signal and the previous
The video signal is input by inputting the second color difference signal.
Determines whether the hue represented by is within the hue range of the specific color
If the specific color is within the hue range, the saturation is further increased.
The video signal is obtained by comparing the brightness signal with the luminance signal.
Whether the saturation of the color represented by is within the saturation range of the specific color.
Discriminating the color within the hue range and the saturation range of the specific color
If the color represented by the video signal is the area of the specific color
Is output, and the saturation and the specific color are output.
Is compared with a representative value of the saturation range of
If it is larger than the representative value of the saturation range of the fixed color,
The difference between the upper limit of the color saturation range and the saturation is determined by a low-pass
Output through a filter or bandpass filter,
The saturation is smaller than a representative value of a saturation range of the specific color.
The saturation and the lower limit of the saturation range of the specific color.
Low-pass filter or band-pass filter
And output it.

A video signal according to the present invention.
The processing device and the video signal processing method are provided with a luminance signal and a first signal.
Processing a video signal including a color difference signal and a second color difference signal
At this time, the first color difference signal is added to the second color difference signal.
At the time of subtraction, the first color difference signal is replaced with the second color difference signal.
Control the first amount to be added to or subtracted from the signal (first gain control)
When adding or subtracting the second color difference signal from the first color difference signal
Adding and subtracting the second color difference signal to and from the first color difference signal
(A second gain control) to control the hue of the specific color.
Within the range, the first color difference signal and the second color difference signal
And the saturation is determined outside the hue range of the specific color.
Look-up table having a value distinguishable from the saturation
Input the first color difference signal and the second color difference signal to the
The hue represented by the video signal is
The hue range of the specific color is determined.
If so, further compare the saturation with the luminance signal.
The saturation of the color represented by the video signal
Determine whether the color is within the saturation range or not, and determine the hue range of the specific color.
If the color is within the range and the saturation range, the table of the video signal is displayed.
Outputs a detection signal indicating that the dodge color is in the specific color area
And calculating the saturation and a representative value of the saturation range of the specific color.
Compare, the saturation is a representative value of the saturation range of the specific color
Is larger than the upper limit of the saturation range of the specific color and
The difference from the saturation is output as a correction amount, and the saturation is
If it is smaller than the representative value of the saturation range of the specific color,
The difference between the saturation and the lower limit of the saturation range of the specific color is compensated.
Output as a positive amount, and output the same according to the magnitude of the correction amount.
The first amount and the second amount in one gain control step.
Independently controlling the second amounts in the gain control step
And a table of the video signal in the area of the specific color.
Color correction is performed on the forecast color.

A video signal according to the present invention.
The processing device and the video signal processing method are provided with a luminance signal and a first signal.
Processing a video signal including a color difference signal and a second color difference signal
At this time, the first color difference signal is added to the second color difference signal.
At the time of subtraction, the first color difference signal is replaced with the second color difference signal.
Control the first amount to be added to or subtracted from the signal (first gain control)
When adding or subtracting the second color difference signal from the first color difference signal
Adding and subtracting the second color difference signal to and from the first color difference signal
(A second gain control) to control the hue of the specific color.
Within the range, the first color difference signal and the second color difference signal
And the saturation is determined outside the hue range of the specific color.
Look-up table having a value distinguishable from the saturation
Input the first color difference signal and the second color difference signal to the
The hue represented by the video signal is
The hue range of the specific color is determined.
If so, further compare the saturation with the luminance signal.
The saturation of the color represented by the video signal
Determine whether the color is within the saturation range or not, and determine the hue range of the specific color.
If the color is within the range and the saturation range, the table of the video signal is displayed.
Outputs a detection signal indicating that the dodge color is in the specific color area
And calculating the saturation and a representative value of the saturation range of the specific color.
Compare, the saturation is a representative value of the saturation range of the specific color
Is larger than the upper limit of the saturation range of the specific color and
The difference from the saturation is output as a correction amount, and the saturation is
If it is smaller than the representative value of the saturation range of the specific color,
The difference between the saturation and the lower limit of the saturation range of the specific color is compensated.
Output as a positive amount, and the output of slicing the correction amount is large.
In the first gain control step according to the magnitude
And the second in the second gain control step.
To control the amount of
Color correction for the color represented by the video signal.

A video signal according to the present invention.
The processing device and the video signal processing method are provided with a luminance signal and a first signal.
Processing a video signal including a color difference signal and a second color difference signal
At this time, the first color difference signal is added to the second color difference signal.
At the time of subtraction, the first color difference signal is replaced with the second color difference signal.
Control the first amount to be added to or subtracted from the signal (first gain control)
When adding or subtracting the second color difference signal from the first color difference signal
Adding and subtracting the second color difference signal to and from the first color difference signal
(A second gain control) to control the hue of the specific color.
Within the range, the first color difference signal and the second color difference signal
And the saturation is determined outside the hue range of the specific color.
Look-up table having a value distinguishable from the saturation
Input the first color difference signal and the second color difference signal to the
The hue represented by the video signal is
The hue range of the specific color is determined.
If so, further compare the saturation with the luminance signal.
The saturation of the color represented by the video signal
Determine whether the color is within the saturation range or not, and determine the hue range of the specific color.
If the color is within the range and the saturation range, the table of the video signal is displayed.
Outputs a detection signal indicating that the dodge color is in the specific color area
And calculating the saturation and a representative value of the saturation range of the specific color.
Compare, the saturation is a representative value of the saturation range of the specific color
Is larger than the upper limit of the saturation range of the specific color and
The difference from the saturation is output as a correction amount, and the saturation is
If it is smaller than the representative value of the saturation range of the specific color,
The difference between the saturation and the lower limit of the saturation range of the specific color is compensated.
Output as a positive amount, and the output of the
The first gain control step according to the size;
A first amount and the second gain control step;
2 are controlled independently of each other in the specific color area.
Color correction for the color represented by the video signal.

A video signal according to the present invention.
The processing device and the video signal processing method are provided with a luminance signal and a first signal.
Processing a video signal including a color difference signal and a second color difference signal
At this time, the first color difference signal is added to the second color difference signal.
At the time of subtraction, the first color difference signal is replaced with the second color difference signal.
Control the first amount to be added to or subtracted from the signal (first gain control)
When adding or subtracting the second color difference signal from the first color difference signal
Adding and subtracting the second color difference signal to and from the first color difference signal
(A second gain control) to control the hue of the specific color.
Within the range, the first color difference signal and the second color difference signal
And the saturation is determined outside the hue range of the specific color.
Look-up table having a value distinguishable from the saturation
Input the first color difference signal and the second color difference signal to the
The hue represented by the video signal is
Determine whether or not within the hue range, within the hue range of the specific color
If so, further compare the saturation with the luminance signal
The saturation of the color represented by the video signal is
The hue range of the specific color.
If the color is within the saturation range, the color of the video signal is represented.
Output a detection signal indicating that the color is in the specific color area,
Compare the saturation with a representative value of the saturation range of the specific color
And the saturation is greater than a representative value of the saturation range of the specific color.
Is larger than the upper limit of the saturation range of the specific color and the
The difference from the saturation is output as a correction amount, and the saturation is
If the saturation is smaller than the representative value of the saturation range of the specific color,
The difference between the sum and the lower limit of the saturation range of the specific color is the correction amount.
And output the correction amount through a filter.
In the first gain control step according to the magnitude
And the second in the second gain control step.
To control the amount of
Color correction for the color represented by the video signal.

A video signal according to the invention of claims 9 and 19
Claims: A processing device and a video signal processing method
Video signal processing apparatus and video of 1-8 and 11-18
The contents of the lookup table in the signal processing method are
The saturation level determined from the first color difference signal and the second color difference signal.
Hue range identification to distinguish between within the hue range of the fixed color and outside the hue range
An additional flag, wherein the first color difference signal is
And the second color difference signal is within the hue range of the specific color.
The m-bit first color difference signal and the m-bit
Each of the upper n bits of the second color difference signal is
Fill in the lookup table and enter the lookup table
The output value output from the cable is increased by mn bits.
The difference is defined as a first saturation, and the first color difference is further determined.
Lower mn bits of the signal and lower bits of the second color difference signal
mn bits and the look-up table, respectively.
Is added to the first saturation obtained by inputting the first saturation
The first color difference signal and the second color difference signal
Is determined from the following equation.

A video signal according to the invention of claims 10 and 20
Signal processing device and video signal processing method,
Item 1-8 and the image signal processing device and the image
The content of the lookup table in the image signal processing method is
To the saturation determined from the first color difference signal and the second color difference signal
Hue range that distinguishes between the hue range and the hue range of a specific color
An identification flag added to the first color difference signal;
Signal and the second color difference signal are within the hue range of the specific color.
In some cases, the first color difference signal of m bits and m bits
Of each of the upper n bits of the second color difference signal
Enter the lookup table
Increase the output value output from the table by mn bits
The first saturation is defined as the first saturation, and the first color
The lower mn bits of the difference signal and the lower
Comparing the order mn bits with the comparator,
The sum of the first saturation and the first color difference signal
And the degree of saturation determined from the second color difference signal.

[0026]

[Embodiment 1] FIG. 1 is a block circuit diagram showing a video signal processing device according to Embodiment 1 of the present invention. In the figure, 1 is a look-up table, and 2 is a specific color detection circuit.

Next, the operation will be described. By inputting the RY color difference signal and the BY color difference signal into the look-up table 1, a saturation C determined from the RY color difference signal and the BY color difference signal is output. The saturation C is given by the following equation (1)
It is calculated as follows. As shown in FIG. 2, the output C for the inputs RY and BY is stored in the look-up table 1 within the hue range of the specific color, and 0 is stored outside the hue range of the specific color. In Expression (1), ＾ is an arithmetic symbol indicating a power. C = ((R−Y) ＋2+ (B−Y) ＾ 2)) ＾ 0.5 (1) The saturation C and the luminance signal Y are input to the specific color detection circuit 2,
The degree of approximation AP to the specific color and the detection signal D are obtained. The approximation AP has the maximum value of the representative value in the saturation range of the specific color, and becomes smaller when deviated from the representative value, and becomes 0 at the boundary of the saturation range of the specific color. The detection signal D is a sign bit of the degree of approximation AP, and is 1 when the specific color is negative and 0 when the specific color is positive.

The specific color detection circuit 2 will be described. The specific color detection circuit 2 is configured as shown in FIG. In FIG. 3, 3 is a comparator, 4 is a switch circuit, 5 and 6 are adders,
7 is a zero comparator, and 8 is an OR gate.

Next, the operation will be described. In the three-dimensional space represented by the RY color difference signal, the BY color difference signal, and the luminance signal Y, all points distributed on a vector extending in a certain direction from the origin can be said to be the same color. It is represented as Here, utilizing the correlation between the color difference signal and the luminance signal, the saturation range of the specific color region is obtained by the relationship between the saturation C and the luminance signal Y as shown in the following equation (2). Here, a and b are constants, and aY is the lower limit of the saturation range of the specific color, and bY is the upper limit (a <b) of the saturation range of the specific color. aY ≦ C ≦ bY (2) Here, for example, Y is 26, a is 1/16, and b is １ ／.
Then, the specific color area is a range surrounded by a thin line in FIG.

A color in which the output C of the lookup table 1 is larger than 0 and the saturation C is within the range of the equation (2) is regarded as a color in the specific color area. Here, a representative value d of the saturation range of the specific color that satisfies the relationship a <d <b is set. FIG.
, DY and C obtained by multiplying the luminance signal Y by d are compared by the comparator 3, and if dY ≦ C, 0 is set as the output of the comparator 3,
If dY> C, 1 is set as the output of the comparator 3. The output C-aY obtained by subtracting aY from C by the adder 5 and the adder 6
Then, an output bY-C obtained by subtracting C from bY is input to the switch circuit 4. Here, when the outputs from the adders 5 and 6 are negative values, they are indicated by two's complement. The most significant bit (MSB) of the output of the adders 5 and 6 is a sign bit, and is 1 when negative and 0 when positive. When the output of the comparator 3 is 0, the switch circuit 4 switches to bY-C, and when the output of the comparator 3 is 1, it switches to CaY, and the value is used as the approximation AP.
Further, only the sign bit of the approximation degree AP is taken out and ORed.
Input to gate 8. The zero comparator 7 outputs 1 when the saturation C is 0, outputs 0 when the saturation C is not 0, and inputs the output value of the zero comparator 7 to the OR gate 8. Therefore, the detection signal D has a saturation C of 0 and is out of the hue range of the specific color.
Or when the saturation C is out of the range represented by the equation (2) and out of the saturation range of the specific color, 1 is set. And Degree of approximation A
FIG. 5 shows the relationship between P and the detection signal D. The degree of approximation AP is determined by setting dY within the saturation range of the specific color to the maximum and defining the boundaries aY and bY.
Is set to 0. That is, the degree of approximation AP is larger for a color closer to the specific color, and is smaller for a color shifted from the specific color. The detection signal D is set to 0 only in the specific color area, and is set to 1 outside the specific color area. As a result, it is possible to accurately detect the color in the specific color region, and to quantitatively detect whether the color to be detected is the specific color according to the magnitude of the approximation AP. .

Embodiment 2 FIG. FIG. 6 is a block circuit diagram showing a video signal processing device according to the second embodiment of the present invention. In the figure, the description of the same reference numerals as in FIG. 1 is omitted. 9 is a slice circuit.

Next, the operation will be described. By inputting the RY color difference signal and the BY color difference signal into the look-up table 1, a saturation C determined from the RY color difference signal and the BY color difference signal is output. The degree of saturation C is calculated as in equation (1). As shown in FIG. 2, the output C for the inputs RY and BY is stored in the look-up table 1 within the hue range of the specific color, and 0 is stored outside the hue range of the specific color. The saturation C and the luminance signal Y are determined by the specific color detection circuit 2
To obtain an approximation degree AP ′ and a detection signal D.
The degree of approximation AP ′ has the maximum value at the representative value of the saturation range of the specific color, and decreases when deviated from the representative value, and becomes 0 at the boundary of the saturation range of the specific color. That is, the degree of approximation AP 'is larger for a color closer to the specific color, and smaller for a color shifted from the specific color. The detection signal D is a sign bit of the approximation degree AP ′, and indicates a negative value if the color is not a specific color, and indicates a positive value if the color is a specific color.
Becomes The specific color detection circuit 2 operates as described in the first embodiment.

The slice circuit 9 will be described. As shown in FIG. 7, in the slice circuit 9, when the approximation degree AP ′ exceeds H, all the outputs are set to H. That is, the approximation degree AP ′
Is sliced with H. The sliced output is set as the approximation degree AP. For this reason, the change of the approximation degree AP becomes gentle. As a result, it is possible to accurately detect the color in the specific color region, and to quantitatively detect whether the color to be detected is the specific color according to the magnitude of the approximation AP. .

Embodiment 3 FIG. FIG. 8 is a block circuit diagram showing a video signal processing device according to the third embodiment of the present invention. In the figure, the description of the same reference numerals as in FIG. 1 is omitted. 10
Is a nonlinear conversion circuit.

Next, the operation will be described. By inputting the RY color difference signal and the BY color difference signal into the look-up table 1, a saturation C determined from the RY color difference signal and the BY color difference signal is output. The degree of saturation C is calculated as in equation (1). As shown in FIG. 2, the output C for the inputs RY and BY is stored in the look-up table 1 within the hue range of the specific color, and 0 is stored outside the hue range of the specific color. The saturation C and the luminance signal Y are determined by the specific color detection circuit 2
To obtain an approximation degree AP ′ and a detection signal D.
The degree of approximation AP ′ has the maximum value at the representative value of the saturation range of the specific color, and decreases when deviated from the representative value, and becomes 0 at the boundary of the saturation range of the specific color. That is, the degree of approximation AP 'is larger for a color closer to the specific color, and smaller for a color shifted from the specific color. The detection signal D is a sign bit of the approximation degree AP ′, and indicates a negative value if the color is not a specific color, and indicates a positive value if the color is a specific color.
Becomes The specific color detection circuit 2 operates as described in the first embodiment.

Next, the nonlinear conversion circuit 10 will be described. Y
Since the three-dimensional space represented by the signal, the RY color difference signal, and the BY color difference signal is not a linear space when considered by human perception, the approximation AP ′ is not linear as the amount of human perception. Therefore, as shown in FIG.
, The change of the approximation AP ′ is converted by a higher-order function to obtain an approximation AP corresponding to human perception. As a result, it becomes possible to accurately detect the color in the specific color area, and further, it is possible to detect whether or not the color to be detected is the specific color as the amount of perception according to the magnitude of the approximation AP. .

Embodiment 4 FIG. FIG. 10 is a block circuit diagram showing a video signal processing device according to Embodiment 4 of the present invention. In the figure, the description of the same reference numerals as in FIG. 1 is omitted. 1
1 is a filter.

Next, the operation will be described. By inputting the RY color difference signal and the BY color difference signal into the look-up table 1, a saturation C determined from the RY color difference signal and the BY color difference signal is output. The degree of saturation C is calculated as in equation (1). As shown in FIG. 2, the output C for the inputs RY and BY is stored in the look-up table 1 within the hue range of the specific color, and 0 is stored outside the hue range of the specific color. The saturation C and the luminance signal Y are determined by the specific color detection circuit 2
To obtain an approximation degree AP ′ and a detection signal D.
The degree of approximation AP ′ has the maximum value at the representative value of the saturation range of the specific color, and decreases when deviated from the representative value, and becomes 0 at the boundary of the saturation range of the specific color. That is, the degree of approximation AP 'is larger for a color closer to the specific color, and smaller for a color shifted from the specific color. The detection signal D is a sign bit of the approximation degree AP ′, and indicates a negative value if the color is not a specific color, and indicates a positive value if the color is a specific color.
Becomes The specific color detection circuit 2 operates as described in the first embodiment.

The filter 11 will be described. When the filter 11 is a low-pass filter, for example, as shown in FIG.
The fall from dY to bY is smoothly changed to be the approximation degree AP. As a result, it is possible to accurately detect the color in the specific color region, and to quantitatively detect whether the color to be detected is the specific color according to the magnitude of the approximation AP. .

Embodiment 5 FIG. FIG. 12 is a block circuit diagram showing a video signal processing device according to Embodiment 5 of the present invention. In the figure, the description of the same reference numerals as in FIG. 1 is omitted. 1
2 is a first gain control circuit, 13 is a second gain control circuit, 14
Denotes a first arithmetic circuit, and 15 denotes a second arithmetic circuit.

Next, the operation will be described. As described in the first embodiment, the approximation AP and the detection signal D are obtained from the specific color detection circuit 2. The RY color difference signal is supplied to a second gain control circuit 1
3 and the first arithmetic circuit 14, and the BY color difference signal is input to the first gain control circuit 12 and the second arithmetic circuit 15.
When the detection signal D is 0, the first gain control circuit 12 and the second gain control circuit 13 control the gains of the BY color difference signal and the RY color difference signal in accordance with the magnitude of the approximation AP. Then, the output of the first gain control circuit 12 is input to the first arithmetic circuit 14, and the output of the second gain control circuit 13 is
It is input to the arithmetic circuit 15. When the detection signal D is 0, the first
The arithmetic circuit 14 adds and subtracts the BY color difference signal to the RY color difference signal according to the approximation AP, and the second arithmetic circuit 15 adds and subtracts the RY color difference signal to the BY color difference signal according to the approximation AP. Then, the respective calculation results are output as an RY color difference signal and a BY color difference signal. As a result, it is possible to move the hue of only a specific color, so that in a color video camera, it is possible to correct a color that has been difficult to express due to the spectral sensitivity characteristics of the image sensor to an appropriate color. It is also effective when the actual color is different from the actual color due to human memory color such as skin color.

Embodiment 6 FIG. FIG. 13 is a block circuit diagram showing a video signal processing device according to Embodiment 6 of the present invention. In the drawings, the description of the same reference numerals as those in FIGS. 6 and 12 is omitted.

Next, the operation will be described. As described in the first embodiment, the approximation degree AP ′ and the detection signal D are obtained from the specific color detection circuit 2. For example, the slice circuit 9 slices the approximation AP ′ by H and outputs the result as the approximation AP. The RY color difference signal is supplied to the second gain control circuit 13 and the first gain control circuit 13.
The signal is input to the arithmetic circuit 14, and the BY color difference signal is input to the first gain control circuit 12 and the second arithmetic circuit 15. When the detection signal D is 0 in the first gain control circuit 12 and the second gain control circuit 13, B-
The gains of the Y color difference signal and the RY color difference signal are controlled. Then, the output of the first gain control circuit 12 is input to the first arithmetic circuit 14, and the output of the second gain control circuit 13 is input to the second arithmetic circuit 1
Enter 5 When the detection signal D is 0, the first arithmetic circuit 1
In step 4, the BY color difference signal is added to or subtracted from the RY color difference signal in accordance with the approximation degree AP.
The Y color difference signal is added or subtracted according to the approximation degree AP, and the respective calculation results are output as an RY color difference signal and a BY color difference signal. As a result, it is possible to move the hue of only a specific color, so that in a color video camera, it is possible to correct a color that has been difficult to express due to the spectral sensitivity characteristics of the image sensor to an appropriate color. It is also effective when the actual color is different from the actual color due to human memory color such as skin color. Since the change of the approximation degree AP is made gentle by the slice circuit 9,
These color corrections can be performed with natural changes in which the boundaries are less noticeable.

Embodiment 7 FIG. FIG. 14 is a block circuit diagram showing a video signal processing device according to Embodiment 7 of the present invention. In the drawings, those having the same reference numerals as those in FIGS. 8 and 12 will not be described.

Next, the operation will be described. As described in the first embodiment, the approximation degree AP ′ and the detection signal D are obtained from the specific color detection circuit 2. For example, the non-linear conversion circuit 10 converts the approximation AP ′ using a higher-order function, and outputs a result obtained as a smooth change as the approximation AP. The RY color difference signal is input to the second gain control circuit 13 and the first arithmetic circuit 14,
The BY color difference signal is input to the first gain control circuit 12 and the second arithmetic circuit 15. When the detection signal D is 0, the first gain control circuit 12 and the second gain control circuit 13 control the gains of the BY color difference signal and the RY color difference signal in accordance with the magnitude of the approximation AP. Then, the first gain control circuit 1
2 is input to the first arithmetic circuit 14, and the output of the second gain control circuit 13 is input to the second arithmetic circuit 15. When the detection signal D is 0, the first arithmetic circuit 14 converts the RY color difference signal into B signal.
The second arithmetic circuit 15 adds the RY color difference signal to the BY color difference signal by using the RY color difference signal as an approximation degree A.
Addition and subtraction are performed according to P, and the respective calculation results are output as an RY color difference signal and a BY color difference signal. As a result, it is possible to move the hue of only a specific color, so that in a color video camera, it is possible to correct a color that has been difficult to express due to the spectral sensitivity characteristics of the image sensor to an appropriate color.
It is also effective when the actual color is different from the actual color due to human memory color such as skin color. Y signal, RY color difference signal, B-
Since the three-dimensional space represented by the Y color difference signal is not a linear space when considered by human perception, sufficient color correction cannot be performed by linear correction. Therefore, if the change of the approximation AP ′ is non-linearly converted by the non-linear conversion circuit 10 and the gains of the RY color difference signal and the BY color difference signal are controlled as the correction amount corresponding to the human perception, the boundary becomes less noticeable. It can be done with various changes.

Embodiment 8 FIG. FIG. 15 is a block circuit diagram showing a video signal processing device according to the eighth embodiment of the present invention. In the drawings, those having the same reference numerals as those in FIGS. 10 and 12 will not be described.

Next, the operation will be described. As described in the first embodiment, the approximation degree AP ′ and the detection signal D are obtained from the specific color detection circuit 2. By the filter 11, for example, the approximation degree A
A high-frequency component of P ′ is removed and a smooth change is output as an approximation AP. The RY color difference signal is
Input to the gain control circuit 13 and the first arithmetic circuit 14,
The first gain control circuit 12 and the second arithmetic circuit 1
Enter 5 When the detection signal D is 0, the first gain control circuit 12 and the second gain control circuit 13 control the gains of the BY color difference signal and the RY color difference signal in accordance with the magnitude of the approximation AP. Then, the output of the first gain control circuit 12 is input to the first arithmetic circuit 14, and the second gain control circuit 1
3 is input to the second arithmetic circuit 15. When the detection signal D is 0, the first arithmetic circuit 14 converts the RY color difference signal into BY color.
The chrominance signal is added or subtracted according to the approximation AP, and the RY chrominance signal is added to or subtracted from the BY chrominance signal according to the approximation AP by the second arithmetic circuit 15, and the respective computation results are calculated as the RY chrominance signal, Output as a BY color difference signal. As a result, it is possible to move the hue of only a specific color, so that in a color video camera, it is possible to correct a color that has been difficult to express due to the spectral sensitivity characteristics of the image sensor to an appropriate color. It is also effective when the actual color is different from the actual color due to human memory color such as skin color. Since the change in the approximation degree AP is smoothed by the filter 11, these color corrections can be performed with natural changes in which the boundaries are less noticeable.

Embodiment 9 FIG. FIG. 16 is a block circuit diagram showing a video signal processing device according to Embodiment 9 of the present invention. In the figure, the description of the same reference numerals as in FIG. 1 is omitted. 1
6 is a first bit shift circuit, 17 is a second bit shift circuit, 18 is a third bit shift circuit, and 19, 20, and 21 are adders. However, the lookup table 1 in this embodiment has four ports for input and two ports for output.

In FIG. 2, the saturation degree C determined from the RY color difference signal and the BY color difference signal is stored in the lookup table 1 within the hue range of the specific color, and 0 outside the hue range of the specific color. In this embodiment, as shown in FIG. 18, the most significant bit (M
SB), adding 1 bit as a hue range identification flag,
When the hue range identification flag is 0, the hue range is within the hue range. When the hue range identification flag is 1, the hue range is outside the hue range. Therefore, in this embodiment, the specific color detection circuit 2 shown in FIG. 3 is configured as shown in FIG. The difference from FIG. 3 is that the zero comparator 7 becomes unnecessary. Instead, the MSB (hue range identification flag) output from the look-up table 1 is input to the OR gate 8 to determine whether or not the area is a specific color area. FIG. 16 will be described. For example, R-
The Y color difference signal and the BY color difference signal are m bits. The structure of this signal is such that the MSB is a sign bit and the negative is 1 and the positive is 0. The remaining bits, both positive and negative, represent the absolute value of the value. That is, 0101 is +5 and 1101 is -5. The RY color difference signal and the BY color difference signal are converted by the first bit shift circuit 16 into upper n bits RYn and BYn reduced by p (p = m−1−n) bits. FIG. 17 shows these relationships. The RYn and BYn are input to the look-up table 1 and the value obtained by removing only the MSB of the output value is input to the third bit shift circuit 18. The MSB is a flag for identifying whether the color is within the hue range or outside the hue range of the specific color, and is output separately from other bits.
In the third bit shift circuit 18, the input value is 0 for p bits.
Is output as the saturation C1. Further, RYn and BYn are increased by p bits by the second bit shift circuit 17 and returned to the original digits, and the sign bits are removed to be RY and BY, respectively. Since RY and BY are all 0 for the lower p bits, the RY color difference signal, B-
The absolute value is smaller than the absolute value of the Y color difference signal. Further, adders 19 and 20 respectively calculate R and R values from absolute values of the RY color difference signal and the BY color difference signal excluding the sign bit.
Y and BY are subtracted to obtain RYp and BYp for the lower p bits of the RY color difference signal and the BY color difference signal. This RYp, B
Yp subtracts the small absolute value (RY, BY) from the large absolute value (RY, BY), so that the original signal (R
-Y, BY). RYp and BYp are input to the look-up table 1 to obtain the saturation C2 excluding the MSB. The saturation C is obtained by adding the saturation C1 and the saturation C2 by the adder 21. For this reason, it is possible to reduce the capacity of the look-up table 1 and the calculation error.

The reason why the present embodiment obtains the above effects will be described. In FIG. 20, the saturation calculated by the equation (1) using the m-bit RY color difference signal and the m-bit BY color difference signal is represented by C3. When this operation is performed by combining a multiplier and a divider, the circuit scale becomes large. Therefore, the saturation is calculated using a look-up table. Assuming that the input is m bits and the output is q bits, the capacity of the lookup table requires 2 ＾ 2m · q bits. In a look-up table in which inputs are decimated to upper n bits, 2 ＾ 2
A capacity of n · (q−p) bits is required. In this case, the saturation C1 is smaller than C3. At the saturation degree C1, the calculation error increases even if the capacity of the look-up table decreases. A method of reducing the calculation error is the present invention, and a description thereof will be given. RY color difference signal RYp for lower p bits and BY color difference signal BYp for lower p bits
Into the lookup table 1 to obtain the saturation C2,
The saturation C1 in which the digit is corrected by bit-shifting the output of the look-up table 1 which receives the RY color difference signal RYn for the upper n bits and the BY color difference signal BYn for the upper n bits by p bits. And C2 are added to obtain the saturation C. This saturation C is substantially equal to the saturation C3. The reason will be described. As shown in FIG. 20, assuming that the angle between C1 and C3 is e and the angle between C2 and C3 is f, C1,
The relationship between C2 and C3 is as shown in equation (3). C3 = C1 · COS e + C2 · COS f (3) Here, e is a very small angle unless the lookup table is made extremely small. Also, when C2 is large, f is a small angle, and when f is large, C2 is very small with respect to C1, so that equation (4) is established. C3 ≒ C1 + C2 (4) Therefore, when the saturation is calculated by dividing the input into upper bits and lower bits and using each output as in the calculation method of the present embodiment, the calculation error can be reduced. Becomes possible.

Embodiment 10 FIG. FIG. 21 shows Embodiment 10 of the present invention.
FIG. 2 is a block circuit diagram illustrating a video signal processing device in FIG. In the figure, the description of the same reference numerals as in FIG. 16 is omitted. 22 is a comparator. However, the lookup table 1 in this embodiment has two ports for input and one port for output.

In FIG. 2, the saturation degree C determined from the RY color difference signal and the BY color difference signal is stored in the look-up table 1 within the hue range of the specific color, and 0 outside the hue range of the specific color. In this embodiment, as shown in FIG. 18, the most significant bit (M
SB), adding 1 bit as a hue range identification flag,
When the hue range identification flag is 0, the hue range is within the hue range. When the hue range identification flag is 1, the hue range is outside the hue range. Therefore, in this embodiment, the specific color detection circuit 2 shown in FIG. 3 is configured as shown in FIG. The difference from FIG. 3 is that the zero comparator 7 becomes unnecessary. Instead, the MSB (hue range identification flag) output from the look-up table 1 is input to the OR gate 8 to determine whether or not the area is a specific color area. FIG. 21 will be described. For example, R-
The Y color difference signal and the BY color difference signal are m bits. The structure of this signal is such that the MSB is a sign bit and the negative is 1 and the positive is 0. The remaining bits, both positive and negative, represent the absolute value of the value. That is, 0101 is +5 and 1101 is -5. The RY color difference signal and the BY color difference signal are converted by the first bit shift circuit 16 into upper n bits RYn and BYn reduced by p (p = m−1−n) bits. FIG. 17 shows these relationships. The RYn and BYn are input to the look-up table 1 and the value obtained by removing only the MSB of the output value is input to the third bit shift circuit 18. The MSB is a flag for identifying whether the color is within the hue range or outside the hue range of the specific color, and is output separately from other bits.
In the third bit shift circuit 18, the input value is 0 for p bits.
Is output as the saturation C1. Further, RYn and BYn are increased by p bits by the second bit shift circuit 17 and returned to the original digits, and the sign bits are removed to be RY and BY, respectively. Since RY and BY are all 0 for the lower p bits, the RY color difference signal, B-
The absolute value is smaller than the absolute value of the Y color difference signal. Further, adders 19 and 20 respectively calculate R and R values from absolute values of the RY color difference signal and the BY color difference signal excluding the sign bit.
Y and BY are subtracted to obtain RYp and BYp for the lower p bits of the RY color difference signal and the BY color difference signal. This RYp, B
Yp subtracts the small absolute value (RY, BY) from the large absolute value (RY, BY), so that the original signal (R
-Y, BY). RYp and BYp are input to the comparator 22, and the larger one is set as the saturation degree C4. The saturation C1 and the saturation C4 are added by the adder 21 to obtain the saturation C. For this reason, it is possible to reduce the capacity of the look-up table 1 and the calculation error.

The reason why the present embodiment achieves the above effects will be described. In FIG. 20, the saturation calculated by the equation (1) using the m-bit RY color difference signal and the m-bit BY color difference signal is represented by C3. When this operation is performed by combining a multiplier and a divider, the circuit scale becomes large. Therefore, the saturation is calculated using a look-up table. Assuming that the input is m bits and the output is q bits, the capacity of the lookup table requires 2 ＾ 2m · q bits. In a look-up table in which inputs are decimated to upper n bits, 2 ＾ 2
A capacity of n · (q−p) bits is required. In this case, the saturation C1 is smaller than C3. At the saturation degree C1, the calculation error increases even if the capacity of the look-up table decreases. A method of reducing the calculation error is the present invention, and a description thereof will be given. RY color difference signal RYp for lower p bits and BY color difference signal BYp for lower p bits
Are compared by the comparator 22, and the larger value C4, the RY color difference signal RYn for the upper n bits, and the B for the upper n bits are compared.
The saturation C is obtained by adding the saturations C1 and C4 whose digits have been corrected by bit-shifting the output of the look-up table 1 to which the −Y color difference signal BYn is input by p bits. This saturation C is substantially equal to the saturation C3. The reason will be described. As shown in FIG. 20, when an angle between C1 and C3 is e and an angle between C2 and C3 is f, C1, C2, C
The relationship of 3 is as shown in Expression (4) as shown in the third embodiment. Further, in equation (4), the same holds when C4 is added to C1 instead of C2. Therefore, when the saturation is calculated by dividing the input into upper bits and lower bits and using the respective outputs as in the calculation method of the present embodiment, the calculation error can be reduced.

In the ninth embodiment, four input ports and two output ports are used. However, if the reading speed of the lookup table 1 is sufficiently high, the frequency of the color difference signal for the upper n bits and the lower p bits is increased. It is also possible to have two input ports and one output port by inputting the data to the lookup table 1 in a time-division manner, synchronizing the output using a switch circuit and a delay circuit, and then adding and returning the frequency to be slowed down. It is. In the ninth and tenth embodiments, a signal for upper n bits and a signal for lower p bits are extracted using a bit shift circuit. However, in the case of a digital circuit, a signal line for upper n bits or a lower p bit is used. Only need to be extracted and directly input to the look-up table 1. In this case, the adders 19 and 20 become unnecessary. In the ninth and tenth embodiments, the output when the upper n bits are input is the output obtained by adding 0 for p bits by the third bit shift circuit 18 and the output when the lower p bits are input. Is added by the adder 21. In the case of a digital circuit,
By combining the signal lines of the respective outputs, a signal bit-shifted by p bits is added. In this case, the third bit shift circuit 18 and the adder 21 are unnecessary. Further, the look-up table 1 in the above embodiment is a ROM (Read Only Memory), a RAM (Random Acc
(Essue Memory) or a storage medium such as a CD, a magneto-optical disk, a magnetic disk, or a magnetic tape.

[0055]

According to the first and eleventh aspects of the present invention, a video signal is provided.
According to the signal processing device and the video signal processing method, the luminance signal
And a video signal including a first color difference signal and a second color difference signal.
In processing, the first color is within a hue range of a specific color.
Having a degree of saturation determined from the difference signal and the second color difference signal.
However, it can be distinguished from the saturation outside the hue range of the specific color.
The first color difference signal in a look-up table having
Signal and the second color difference signal,
Whether the hue represented by the video signal is within the hue range of the specific color
And if it is within the hue range of the specific color,
By comparing the saturation and the luminance signal,
The saturation of the color represented by the video signal is within the saturation range of the specific color.
Whether the color is within the hue range and the saturation range of the specific color.
If the color is within the box, the color represented by the video signal is
It outputs a detection signal indicating that it is in the color area, and
Comparing with the representative value of the saturation range of the specific color,
Is larger than the representative value of the saturation range of the specific color,
The difference between the upper limit value of the saturation range of the specific color and the saturation is
Output, wherein the saturation is a representative value of the saturation range of the specific color.
Is smaller than the saturation and the saturation range of the specific color.
Outputs the difference from the lower limit of the
Accurate detection and quantification of whether the detected color is a specific color
This has the effect that it is possible to detect it in a targeted manner.

A video signal according to the second and twelfth aspects of the present invention.
According to the processing device and the video signal processing method, the luminance signal
A video signal including the first color difference signal and the second color difference signal is processed.
The first color difference within the hue range of the specific color.
A saturation determined from the signal and the second color difference signal,
A value that can be distinguished from the saturation outside the hue range of the specific color
The first color difference signal and the
And inputting the second color difference signal,
Determines whether the hue represented by the image signal is within the hue range of the specific color.
Discriminating, if within the hue range of the specific color, further
By comparing the degree of saturation with the luminance signal,
Whether the saturation of the color represented by the signal is within the saturation range of the specific color
And within the hue range and the saturation range of the specific color.
If the color represented by the video signal is
A detection signal indicating that the region is in the region is output, and the saturation and the characteristic are output.
Compare with the representative value of the saturation range of the constant color, and the saturation is
If it is larger than the representative value of the saturation range of the specific color,
The difference between the upper limit of the saturation range of the specific color and the saturation is
And outputting the specific color,
If less than the representative value of the saturation range, the saturation and
By slicing the difference from the lower limit of the saturation range of the specific color
Output to enable accurate detection and detection of specific colors
It is possible to quantitatively detect whether the color is a specific color
There is a possible effect.

A video signal according to the third and thirteenth aspects of the present invention.
According to the processing device and the video signal processing method, the luminance signal
A video signal including the first color difference signal and the second color difference signal is processed.
The first color difference within the hue range of the specific color.
A saturation determined from the signal and the second color difference signal,
A value that can be distinguished from the saturation outside the hue range of the specific color
The first color difference signal and the
And inputting the second color difference signal,
Determines whether the hue represented by the image signal is within the hue range of the specific color.
Discriminating, if within the hue range of the specific color, further
By comparing the degree of saturation with the luminance signal,
Whether the saturation of the color represented by the signal is within the saturation range of the specific color
And within the hue range and the saturation range of the specific color.
If the color represented by the video signal is
A detection signal indicating that the region is in the region is output, and the saturation and the characteristic are output.
Compare with the representative value of the saturation range of the constant color, and the saturation is
If it is larger than the representative value of the saturation range of the specific color,
The difference between the upper limit value of the saturation range of the specific color and the saturation is determined by a non-linear
Shape conversion and output, and the saturation is the saturation range of the specific color.
If less than the representative value of the box, the saturation and the specific color
Non-linear conversion of the difference from the lower limit of the saturation range
As a result, accurate detection of specific colors and detected
It is possible to detect whether the color is constant or not as perceived amount
The effect is as follows.

A video signal according to the invention of claims 4 and 14
According to the processing device and the video signal processing method, the luminance signal
A video signal including the first color difference signal and the second color difference signal is processed.
The first color difference within the hue range of the specific color.
A saturation determined from the signal and the second color difference signal,
A value that can be distinguished from the saturation outside the hue range of the specific color
The first color difference signal and the
And inputting the second color difference signal,
Determines whether the hue represented by the image signal is within the hue range of the specific color.
Discriminating, if within the hue range of the specific color, further
By comparing the degree of saturation with the luminance signal,
Whether the saturation of the color represented by the signal is within the saturation range of the specific color
And within the hue range and the saturation range of the specific color.
If the color represented by the video signal is
A detection signal indicating that the region is in the region is output, and the saturation and the characteristic are output.
Compare with the representative value of the saturation range of the constant color, and the saturation is
If it is larger than the representative value of the saturation range of the specific color,
The difference between the upper limit value of the saturation range of the specific color and the saturation is calculated as a low
Output through pass filter or band pass filter
And the saturation is greater than a representative value of the saturation range of the specific color.
Is smaller than the saturation and the saturation range of the specific color.
Use a low-pass filter or band-pass filter
Output through the filter so that the specific color
Quantitatively determine whether detected and detected colors are specific colors
There is an effect that can be detected.

A video signal according to the present invention.
According to the processing device and the video signal processing method, the luminance signal
A video signal including the first color difference signal and the second color difference signal is processed.
In processing, the first color difference signal is converted to the second color difference signal.
The first color difference signal at the time of addition / subtraction to the second
The first amount to be added to or subtracted from the color difference signal is controlled (first gain control).
Control), the second color difference signal is added to or subtracted from the first color difference signal.
Calculating the second color difference signal into the first color difference signal
Control the second amount to be added to or subtracted from (the second gain control)
Within the hue range of the color, the first color difference signal and the second
It has a saturation determined from the color difference signal, and has a hue range of the specific color.
Outside the box, look-ups with values that can be distinguished from the saturation
The first color difference signal and the second color difference signal
, The hue represented by the video signal is
Determining whether the color is within the hue range of the specific color,
If within the phase range, the saturation and the luminance signal are further
By comparing the color saturation represented by the video signal
Determining whether or not the specific color is within the saturation range;
If the color is within the hue range and the saturation range,
A detection signal indicating that the color represented by the signal is in the specific color area
And outputs a representative value of the saturation and the saturation range of the specific color.
And comparing the saturation with the saturation of the specific color.
If it is larger than the representative value, it will be above the saturation range of the specific color.
The difference between the limit value and the saturation is output as a correction amount,
If the sum is smaller than the representative value of the saturation range of the specific color,
The saturation and the lower limit of the saturation range of the specific color.
The difference is output as a correction amount, and according to the magnitude of the correction amount,
The first amount and the previous value in the first gain control step
Each of the second amounts in the second gain control step is
And independently controlling the video signal in the specific color area.
Since the color correction for the color represented by the symbol has been performed,
Nature with less noticeable boundaries without affecting other colors
Effect that allows color correction of specific colors
is there.

A video signal according to the present invention.
According to the processing device and the video signal processing method, the luminance signal
A video signal including the first color difference signal and the second color difference signal is processed.
In processing, the first color difference signal is converted to the second color difference signal.
The first color difference signal at the time of addition / subtraction to the second
The first amount to be added to or subtracted from the color difference signal is controlled (first gain control).
Control), the second color difference signal is added to or subtracted from the first color difference signal.
Calculating the second color difference signal into the first color difference signal
Control the second amount to be added to or subtracted from (the second gain control)
Within the hue range of the color, the first color difference signal and the second
It has a saturation determined from the color difference signal, and has a hue range of the specific color.
Outside the box, look-ups with values that can be distinguished from the saturation
The first color difference signal and the second color difference signal
, The hue represented by the video signal is
Determining whether the color is within the hue range of the specific color,
If within the phase range, the saturation and the luminance signal are further
By comparing the color saturation represented by the video signal
Determining whether or not the specific color is within the saturation range;
If the color is within the hue range and the saturation range,
A detection signal indicating that the color represented by the signal is in the specific color area
And outputs a representative value of the saturation and the saturation range of the specific color.
And comparing the saturation with the saturation of the specific color.
If it is larger than the representative value, it will be above the saturation range of the specific color.
The difference between the limit value and the saturation is output as a correction amount,
If the sum is smaller than the representative value of the saturation range of the specific color,
The saturation and the lower limit of the saturation range of the specific color.
The difference is output as a correction amount, and the correction amount is output as a slice.
In the first gain control step according to the magnitude of the force
Before the first amount and the second gain control step
The second amount is independently controlled to control the specific color area.
Color correction for the color represented by the video signal at
So that it does not affect other colors
Perform color correction for specific colors with natural changes that make boundaries less noticeable
This has the effect that it becomes possible.

A video signal according to the present invention.
According to the processing device and the video signal processing method, the luminance signal
A video signal including the first color difference signal and the second color difference signal is processed.
In processing, the first color difference signal is converted to the second color difference signal.
The first color difference signal at the time of addition / subtraction to the second
The first amount to be added to or subtracted from the color difference signal is controlled (first gain control).
Control), the second color difference signal is added to or subtracted from the first color difference signal.
Calculating the second color difference signal into the first color difference signal
Control the second amount to be added to or subtracted from (the second gain control)
Within the hue range of the color, the first color difference signal and the second
It has a saturation determined from the color difference signal, and has a hue range of the specific color.
Outside the box, look-ups with values that can be distinguished from the saturation
The first color difference signal and the second color difference signal
, The hue represented by the video signal is
Determining whether the color is within the hue range of the specific color,
If within the phase range, the saturation and the luminance signal are further
By comparing the color saturation represented by the video signal
Determining whether or not the specific color is within the saturation range;
If the color is within the hue range and the saturation range,
A detection signal indicating that the color represented by the signal is in the specific color area
And outputs a representative value of the saturation and the saturation range of the specific color.
And comparing the saturation with the saturation of the specific color.
If it is larger than the representative value, it will be above the saturation range of the specific color.
The difference between the limit value and the saturation is output as a correction amount,
If the sum is smaller than the representative value of the saturation range of the specific color,
The saturation and the lower limit of the saturation range of the specific color.
The difference is output as a correction amount, and the correction amount is nonlinearly converted.
In the first gain control step according to the magnitude of the output,
In the first amount and the second gain control step.
The second amounts are independently controlled to control the area of the specific color.
Color correction for the color represented by the video signal in the
So that it does not affect other colors
Color correction for specific colors with natural changes that make the boundaries inconspicuous.
There is an effect that can be performed.

A video signal according to the invention of claims 8 and 18
According to the processing device and the video signal processing method, the luminance signal
A video signal including the first color difference signal and the second color difference signal is processed.
In processing, the first color difference signal is converted to the second color difference signal.
The first color difference signal at the time of addition / subtraction to the second
The first amount to be added to or subtracted from the color difference signal is controlled (first gain control).
Control), the second color difference signal is added to or subtracted from the first color difference signal.
Calculating the second color difference signal into the first color difference signal
Control the second amount to be added to or subtracted from (the second gain control)
Within the hue range of the color, the first color difference signal and the second
It has a saturation determined from the color difference signal, and has a hue range of the specific color.
Outside the box, look-ups with values that can be distinguished from the saturation
The first color difference signal and the second color difference signal
And the hue represented by the video signal is
Determine whether the color is within the hue range of the specific color, and determine the hue of the specific color.
Within the range, the saturation and the luminance signal are further
By comparing, the saturation of the color represented by the video signal is
It is determined whether the specific color is within the saturation range or not.
If the color is within the hue range and the saturation range, the video signal
Signal indicating that the color represented by the symbol is in the specific color area.
Output the representative value of the saturation and the saturation range of the specific color
Is compared with the saturation range of the specific color.
If it is larger than the table value, the upper limit of the saturation range of the specific color
The difference between the value and the degree of saturation is output as a correction amount,
If the degree is smaller than the representative value of the saturation range of the specific color,
The saturation and the lower limit of the saturation range of the specific color.
The difference is output as a correction amount, and the correction amount is passed through a filter.
In the first gain control step according to the magnitude of the output
In the first amount and the second gain control step.
Controlling the second amounts independently of each other,
Color correction for the color represented by the video signal in the region
So that it does not affect other colors
Color correction for specific colors with natural changes that make boundaries less noticeable
There is an effect that can be performed.

A video signal according to the ninth and nineteenth aspects of the present invention.
According to a processing device and a video signal processing method,
Video signal processing apparatus and video of 1-8 and 11-18
The contents of the lookup table in the signal processing method are
The saturation level determined from the first color difference signal and the second color difference signal.
Hue range identification to distinguish between within the hue range of the fixed color and outside the hue range
An additional flag, wherein the first color difference signal is
And the second color difference signal is within the hue range of the specific color.
The m-bit first color difference signal and the m-bit
Each of the upper n bits of the second color difference signal is
Fill in the lookup table and enter the lookup table
The output value output from the cable is increased by mn bits.
The difference is defined as a first saturation, and the first color difference is further determined.
Lower mn bits of the signal and lower bits of the second color difference signal
mn bits and the look-up table, respectively.
Is added to the first saturation obtained by inputting the first saturation
The first color difference signal and the second color difference signal
Look up because the saturation level is determined from
Even if the table capacity is reduced, the calculation error can be reduced.
This has the effect that it becomes possible.

A video signal according to the present invention.
According to the signal processing device and the video signal processing method,
Item 1-8 and the image signal processing device and the image
The content of the lookup table in the image signal processing method is
To the saturation determined from the first color difference signal and the second color difference signal
Hue range that distinguishes between the hue range and the hue range of a specific color
An identification flag added to the first color difference signal;
Signal and the second color difference signal are within the hue range of the specific color.
In some cases, the first color difference signal of m bits and m bits
Of each of the upper n bits of the second color difference signal
Enter the lookup table
Increase the output value output from the table by mn bits
The first saturation is defined as the first saturation, and the first color
The lower mn bits of the difference signal and the lower
Comparing the order mn bits with the comparator,
The sum of the first saturation and the first color difference signal
And a saturation determined from the second color difference signal.
Therefore, even if the size of the lookup table is reduced,
There is an effect that the calculation error can be reduced.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram illustrating a video signal processing device according to a first embodiment.

FIG. 2 is a diagram showing the contents of a lookup table 1 that stores saturation of a specific color area in Examples 1, 2, 3, 4, 9, and 10;

FIG. 3 is a specific color detection circuit 2 according to the first, ninth, and tenth embodiments.
FIG. 3 is a diagram showing the configuration of FIG.

FIG. 4 is a diagram illustrating a specific color area in a three-dimensional space according to the first embodiment.

FIG. 5 is a diagram illustrating a relationship between an approximation degree AP and a detection signal D with respect to a saturation range of a specific color region in the first embodiment.

FIG. 6 is a block circuit diagram illustrating a video signal processing device according to a second embodiment.

FIG. 7 is a diagram illustrating a relationship between an approximation degree AP and a detection signal D with respect to a saturation range of a specific color region in the second embodiment.

FIG. 8 is a block circuit diagram illustrating a video signal processing device according to a third embodiment.

FIG. 9 is a diagram illustrating a relationship between an approximation AP and a detection signal D with respect to a saturation range of a specific color region according to a third embodiment.

FIG. 10 is a block circuit diagram illustrating a video signal processing device according to a fourth embodiment.

FIG. 11 is a diagram illustrating a relationship between an approximation degree AP and a detection signal D with respect to a saturation range of a specific color region in a fourth embodiment.

FIG. 12 is a block circuit diagram illustrating a video signal processing device according to a fifth embodiment.

FIG. 13 is a block circuit diagram illustrating a video signal processing device according to a sixth embodiment.

FIG. 14 is a block circuit diagram illustrating a video signal processing device according to a seventh embodiment.

FIG. 15 is a block circuit diagram illustrating a video signal processing device according to an eighth embodiment.

16 is a block circuit diagram of a video signal processing apparatus in Example 9.

FIG. 17 is a diagram illustrating a configuration of each bit of an RY color difference signal and a BY color difference signal in Examples 9 and 10.

FIG. 18 is a diagram showing the contents of a look-up table 1 that stores saturation and a specific color identification flag in Examples 9 and 10.

FIG. 19 is a diagram illustrating a configuration of a specific color detection circuit 2 according to the ninth and tenth embodiments.

FIG. 20 shows the saturation C when the capacity of the lookup table 1 in the ninth and tenth embodiments is 2 と し た 2m · q bits.
3, and the capacity of the lookup table 1 is 2 ＾ 2n ·
The RY color difference signal and B-
The saturation C1 for the upper n bits of the Y color difference signal and the saturation C2 for the lower p bits of the RY color difference signal and the BY color difference signal.
FIG.

FIG. 21 is a block circuit diagram illustrating a video signal processing device according to a tenth embodiment.

FIG. 22 is a block circuit diagram showing a conventional video signal processing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lookup table 2 Specific color detection circuit 3 Comparator 4 Switch circuit 5, 6 Adder 7 Zero comparator 8 OR gate 9 Slice circuit 10 Nonlinear conversion circuit 11 Filter 12 1st gain control circuit 13 2nd gain control circuit 14th 1 arithmetic circuit 15 second arithmetic circuit 16 first bit shift circuit 17 second bit shift circuit 18 third bit shift circuit 19, 20, 21 adder 22 comparator 23, 24, 25 gain control circuit

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 9/44-9/78

Claims (20)

(57) [Claims] 1. A luminance signal and a video signal in the processing unit, the first color difference signal is within the hue range of the specific color and the second of processing a video signal including a first color difference signal and the second color difference signal has a saturation determined from the color difference signals, and a look-up table wherein the hue range of the specific color having a value which can be distinguished from the saturation, the Le said first color difference signal and the second color difference signal The video signal is input to a backup table.
The video signal by the hue is determined whether or not the hue range of the specific color, as long as it is within the hue range of the specific color, for further comparing the luminance signal and the saturation representative of
Means for saturation of the color, it is determined whether or not the saturation range of the specific color represented by, if the color of the hue range and saturation range of the specific color, the color representative of said video signal is the in the region of a specific color
Means for outputting to the effect that detection signal is compared with the representative value before Symbol saturation and saturation range of the specific color, when the saturation is greater than the representative value of the saturation range of the specific color, wherein outputting a difference between the saturation and the upper limit value of the saturation range of a specific color, when the saturation is less than the representative value of the saturation range of the specific color, the Japanese <br/> constant and the saturation Means for outputting a difference from the lower limit value of the color saturation range.
A video signal processing device. 2. A luminance signal and a video signal in the processing unit, the first color difference signal is within the hue range of the specific color and the second of processing a video signal including a first color difference signal and the second color difference signal has a saturation determined from the color difference signals, the lookup table in the color range of the specific color having a value which can be distinguished from the saturation, the first color difference signal and the second of said Le color difference signals < The video signal is input to a backup table.
The video signal by the hue is determined whether or not the hue range of the specific color, as long as it is within the hue range of the specific color, for further comparing the luminance signal and the saturation representative of
Means for saturation of the color, it is determined whether or not the saturation range of the specific color represented by, if the color of the hue range and saturation range of the specific color, I table of the video signal to the color is but in the region of the specific color
Means for outputting to the effect that detection signal is compared with the representative value before Symbol saturation and saturation range of the specific color, when the saturation is greater than the representative value of the saturation range of the specific color, wherein sliced to outputs of the saturation and the upper limit value of the saturation range of a specific color, when the saturation is less than the representative value of the saturation range of the <br/> specific color, and the saturation a video signal processing apparatus characterized by having a means for outputting the slice a difference between the lower limit of the saturation range of the specific color. 3. A luminance signal and a video signal in the processing unit, the first color difference signal is within the hue range of the specific color and the second of processing a video signal including a first color difference signal and the second color difference signal has a saturation determined from the color difference signals, and a look-up table wherein the hue range of the specific color having a value which can be distinguished from the saturation, the Le said first color difference signal and the second color difference signal The video signal is input to a backup table.
Hue is determined whether or not the hue range of the specific color representing the, if the hue range of the specific color, the video signal by further comparing the saturation and with said luminance signal
Means for saturation of the color, it is determined whether or not the saturation range of the specific color represented by, if the color of the hue range and saturation range of the specific color, the color representative of said video signal is the in the region of a specific color
Means for outputting to the effect that detection signal is compared with the representative value before Symbol saturation and saturation range of the specific color, when the saturation is greater than the representative value of the saturation range of the specific color, wherein the difference between the saturation and the upper limit value of the saturation range of the specific color outputted by the non-linear conversion, the saturation before
If serial less than the representative value of the saturation range of the specific color, video signal, characterized in that it comprises a means for difference in nonlinear converting the output of the lower limit of the saturation range of the specific color and the saturation Processing equipment. 4. A luminance signal and a video signal in the processing unit, the first color difference signal is within the hue range of the specific color and the second of processing a video signal including a first color difference signal and the second color difference signal has a saturation determined from the color difference signals, and a look-up table wherein the hue range of the specific color having a value which can be distinguished from the saturation, the Le said first color difference signal and the second color difference signal The video signal is input to a backup table.
The video signal by the hue is determined whether or not the hue range of the specific color, as long as it is within the hue range of the specific color, for further comparing the luminance signal and the saturation representative of
Means for saturation of the color, it is determined whether or not the saturation range of the specific color represented by, if the color of the hue range and saturation range of the specific color, the color representative of said video signal is the in the region of a specific color
Means for outputting to the effect that detection signal is compared with the representative value before Symbol saturation and saturation range of the specific color, when the saturation is greater than the representative value of the saturation range of the specific color, wherein A difference between the upper limit value of the saturation range of the specific color and the saturation is output through a low-pass filter or a band-pass filter, and when the saturation is smaller than a representative value of the saturation range of the specific color, the saturation is determined. Yes and means for outputting through a difference in degrees between the lower limit value of the saturation range of the Japanese <br/> Teiiro low-pass filter or a band-pass filter
A video signal processing device. 5. The video signal processing apparatus for processing a video signal including a luminance signal and first color difference signal and second color difference signals, the addition or subtraction of the first color difference signal to said second color difference signal 1 calculating means and the second adding and subtracting the first color difference signal and the first gain control means for controlling the amount of addition and subtraction in the second color difference signal, said second color difference signal to said first color difference signal arithmetic means, a second gain control means for controlling the amount of addition and subtraction of the second color difference signal to said first color difference signal, the first color difference signal and the second color difference within the hue range of the specific color has a saturation determined from the signal, the lookup tables having values which can be distinguished from the saturation is outside the color gamut of the specific color, the first color difference signal and said second chrominance signals lookup table the video signal by inputting the Table
Wath hue is determined whether or not the hue range of the specific color, before
Within hue range of serial specific color, further wherein the saturation and before
The video signal is represented by comparing with the luminance signal.
Means for saturation of the color, it is determined whether or not the saturation range of the specific color, wherein when the colors in the color range and saturation range of a specific color, the color representative of said video signal is the specific color In the area of
Means for outputting to the effect that detection signal is compared with the representative value before Symbol saturation and saturation range of the specific color, when the saturation is greater than the representative value of the saturation range of the specific color, wherein A difference between the upper limit value of the saturation range of the specific color and the saturation is output as a correction amount, and when the saturation is smaller than a representative value of the saturation range of the specific color, the saturation and the saturation are output. wherein a difference between the lower limit of the saturation range of the specific color outputted as a correction amount, the correction amount of size control independently said first gain control means and said second gain control means in response to <br / > Gyoshi represented by the said video signal in the region of the specific color by
Means for performing color correction on a color. 6. The video signal processing apparatus for processing a video signal including a luminance signal and first color difference signal and second color difference signals, the addition or subtraction of the first color difference signal to said second color difference signal 1 calculating means and the second adding and subtracting the first color difference signal and the first gain control means for controlling the amount of addition and subtraction in the second color difference signal, said second color difference signal to said first color difference signal arithmetic means, a second gain control means for controlling the amount of addition and subtraction of the second color difference signal to said first color difference signal, the first color difference signal and the second color difference within the hue range of the specific color has a saturation determined from the signal, the lookup tables having values which can be distinguished from the saturation is outside the color gamut of the specific color, the first color difference signal and said second chrominance signals lookup table the video signal by inputting the Table
Wath hue is determined whether or not the hue range of the specific color, before
Within hue range of serial specific color, further wherein the saturation and before
The video signal is represented by comparing with the luminance signal.
Means for saturation of the color, it is determined whether or not the saturation range of the specific color, if the color of the hue range and saturation range of the specific color, Table I to color of the video signal is the in the region of a specific color
Means for outputting to the effect that detection signal is compared with the representative value before Symbol saturation and saturation range of the specific color, when the saturation is greater than the representative value of the saturation range of the specific color, wherein A difference between the upper limit value of the saturation range of the specific color and the saturation is output as a correction amount, and when the saturation is smaller than a representative value of the saturation range of the specific color, the saturation and the saturation are output. wherein a difference between the lower limit of the saturation range of the specific color outputted as the correction amount, the output obtained by slicing the correction amount size the first gain control means and said second gain control means in accordance with the independently control to front in the region of the specific color
Means for performing color correction on the color represented by the video signal.
A video signal processing device comprising: 7. A video signal processing apparatus for processing a video signal including a luminance signal and first color difference signal and second color difference signals, the addition or subtraction of the first color difference signal to said second color difference signal 1 calculating means and the second adding and subtracting the first color difference signal and the first gain control means for controlling the amount of addition and subtraction in the second color difference signal, said second color difference signal to said first color difference signal arithmetic means, a second gain control means for controlling the amount of addition and subtraction of the second color difference signal to said first color difference signal, the first color difference signal and the second color difference within the hue range of the specific color has a saturation determined from the signal, the lookup tables having values which can be distinguished from the saturation is outside the color gamut of the specific color, the first color difference signal and said second chrominance signals lookup table the video signal by inputting the Table
Wath hue is determined whether or not the hue range of the specific color, before
Within hue range of serial specific color, further wherein the saturation and before
The video signal is represented by comparing with the luminance signal.
Means for saturation of the color, it is determined whether or not the saturation range of the specific color, wherein when the colors in the color range and saturation range of a specific color, the color representative of said video signal is the specific color In the area of
Means for outputting to the effect that detection signal is compared with the representative value before Symbol saturation and saturation range of the specific color, when the saturation is greater than the representative value of the saturation range of the specific color, wherein A difference between the upper limit value of the saturation range of the specific color and the saturation is output as a correction amount, and when the saturation is smaller than a representative value of the saturation range of the specific color, the saturation and the saturation are output. the difference between the lower limit of the saturation range of the specific color outputted as the correction amount, independently of the correction amount of the output of the non-linear transformation size the first gain control means and said second gain control means in response to the in the specific color region is controlled to
Means for performing color correction on a color represented by the video signal ;
A video signal processing apparatus characterized by having a. 8. The video signal processing apparatus for processing a video signal including a luminance signal and first color difference signal and second color difference signals, the addition or subtraction of the first color difference signal to said second color difference signal 1 calculating means and the second adding and subtracting the first color difference signal and the first gain control means for controlling the amount of addition and subtraction in the second color difference signal, said second color difference signal to said first color difference signal arithmetic means, a second gain control means for controlling the amount of addition and subtraction of the second color difference signal to said first color difference signal, the first color difference signal and the second color difference within the hue range of the specific color has a saturation determined from the signal, the lookup tables having values which can be distinguished from the saturation is outside the color gamut of the specific color, the first color difference signal and said second chrominance signals lookup table the video signal by inputting the Table
Wath hue is determined whether or not the hue range of the specific color, before
Within hue range of serial specific color, further wherein the saturation and before
The video signal is represented by comparing with the luminance signal.
Means for saturation of the color, it is determined whether or not the saturation range of the specific color, wherein when the colors in the color range and saturation range of a specific color, the color representative of said video signal is the specific color In the area of
Means for outputting to the effect that detection signal is compared with the representative value before Symbol saturation and saturation range of the specific color, when the saturation is greater than the representative value of the saturation range of the specific color, wherein the difference between the saturation and the upper limit value of the saturation range of the specific color outputted as the correction amount, when the saturation is less than the representative value of the saturation range of the <br/> specific color, and the saturation wherein a difference between the lower limit of the saturation range of the specific color outputted as the correction amount, the output through the correction amount in the filter size of the first gain control means and said second gain control means in response to each independently controlled to put the region of the specific color
Means for performing color correction on a color represented by the video signal
And a video signal processing device. 9. The content of a look-up table provided in the video signal processing device according to claim 1 is set within a hue range of a specific color to a saturation determined by a first color difference signal and a second color difference signal. the out of range and obtained by adding a distinguishing color gamut identification flag, when the first color difference signal and the second color difference signal is within the hue range of the specific color, the first color difference m bits and the input signal and m bits of the respective upper n bits of the second color difference signal to each of the look-up table,
The output value output from the lookup table is m-
those increased by n bits to the first saturation, further lower m-n bits and before the first color difference signal
Before serial second color difference signals lower m-n bits and each
The second saturation obtained by inputting the serial look-up table to the saturation determined what was added to the first saturation from said first color difference signal and the second color difference signal
A video signal processing apparatus characterized by constituting the. 10. A look-up table provided in the video signal processing apparatus according to claim 1, wherein the content of the look-up table is within a hue range of a specific color to a saturation determined from the first color difference signal and the second color difference signal. the out of range and obtained by adding a distinguishing color gamut identification flag, when the first color difference signal and the second color difference signal is within the hue range of the specific color, the first color difference m bits and the input signal and m bits of the respective upper n bits of the second color difference signal to each of the look-up table,
The output value output from the lookup table is m-
those increased by n bits to the first saturation, further lower m-n bits and before the first color difference signal
What the larger compared by a comparator and a lower m-n bits of the serial second color difference signal by adding the first saturation
A video signal processing apparatus characterized by the by Uni configured to saturation determined from the first color difference signal and the second color difference signals. 11. A luminance signal, a first color difference signal, and a second color.
Video signal processing method for processing video signals including difference signals
The first color difference signal and the second color difference signal are within a hue range of a specific color.
2 having a degree of saturation determined from the two color difference signals, and
Look that has a value that can be distinguished from the saturation outside the phase range
The first color difference signal and the second color difference signal
By inputting a color difference signal, the
Step for determining whether the hue is within the hue range of the specific color.
And within the hue range of the specific color, the saturation and
By comparing the luminance signal with the luminance signal, a table of the video signal is obtained.
Determines whether the color saturation is within the saturation range of the specific color
And if the color is within the hue range and the saturation range of the specific color.
If the color represented by the video signal is in the specific color area
Outputting a detection signal indicating that the color is saturated, and comparing the saturation with a representative value of the saturation range of the specific color.
And the saturation is greater than a representative value of the saturation range of the specific color.
Is larger than the upper limit of the saturation range of the specific color and the
The difference from the saturation is output, and the saturation is the saturation of the specific color.
If it is smaller than the representative value of the saturation range, the saturation and the characteristic
Outputting the difference from the lower limit of the saturation range of the constant color; and
A video signal processing method comprising: 12. A luminance signal, a first color difference signal, and a second color.
Video signal processing method for processing video signals including difference signals
The first color difference signal and the second color difference signal are within a hue range of a specific color.
2 having a degree of saturation determined from the two color difference signals, and
Look that has a value that can be distinguished from the saturation outside the phase range
The first color difference signal and the second color difference signal
By inputting a color difference signal, the
Step for determining whether the hue is within the hue range of the specific color.
And within the hue range of the specific color, the saturation and
By comparing the luminance signal with the luminance signal, a table of the video signal is obtained.
Determines whether the color saturation is within the saturation range of the specific color
And if the color is within the hue range and the saturation range of the specific color.
In Table I to color of the video signal in the region of the specific color
Outputting a detection signal indicating that the color is saturated, and comparing the saturation with a representative value of the saturation range of the specific color.
And the saturation is greater than a representative value of the saturation range of the specific color.
Is larger than the upper limit of the saturation range of the specific color and the
Slicing and outputting the difference from the degree of saturation;
The saturation is smaller than the representative value of the saturation range of the specific color.
In the case, the saturation and the lower limit of the saturation range of the specific color
And slicing the difference between
Video signal processing method. 13. A luminance signal, a first color difference signal, and a second color.
Video signal processing method for processing video signals including difference signals
The first color difference signal and the second color difference signal are within a hue range of a specific color.
2 having a degree of saturation determined from the two color difference signals, and
Look that has a value that can be distinguished from the saturation outside the phase range
The first color difference signal and the second color difference signal
By inputting a color difference signal, the
Step for determining whether the hue is within the hue range of the specific color.
And within the hue range of the specific color, the saturation and
By comparing the luminance signal with the luminance signal, a table of the video signal is obtained.
Determines whether the color saturation is within the saturation range of the specific color
And if the color is within the hue range and the saturation range of the specific color.
If the color represented by the video signal is in the specific color area
Outputting a detection signal indicating that the color is saturated, and comparing the saturation with a representative value of the saturation range of the specific color.
And the saturation is greater than a representative value of the saturation range of the specific color.
Is larger than the upper limit of the saturation range of the specific color and the
The difference from the saturation is nonlinearly converted and output.
If less than the representative value of the saturation range of the specific color,
The difference between the saturation and the lower limit of the saturation range of the specific color is calculated as a non-linear
Converting and outputting the shape.
Video signal processing method. 14. A luminance signal, a first color difference signal, and a second color.
Video signal processing method for processing video signals including difference signals
The first color difference signal and the second color difference signal are within a hue range of a specific color.
2 having a degree of saturation determined from the two color difference signals, and
Look Outside phase ranges that have a value which can be distinguished from the saturation
The first color difference signal and the second color difference signal
By inputting a color difference signal, the
Step for determining whether the hue is within the hue range of the specific color.
And within the hue range of the specific color, the saturation and
By comparing the luminance signal with the luminance signal, a table of the video signal is obtained.
Determines whether the color saturation is within the saturation range of the specific color
And if the color is within the hue range and the saturation range of the specific color.
If the color represented by the video signal is in the specific color area
Outputting a detection signal indicating that the color is saturated, and comparing the saturation with a representative value of the saturation range of the specific color.
And the saturation is greater than a representative value of the saturation range of the specific color.
Is larger than the upper limit of the saturation range of the specific color and the
Use a low-pass filter or band-pass filter
Filter, and the saturation is the saturation of the specific color.
If it is smaller than the representative value of the saturation range, the saturation and the characteristic
The difference between the constant color saturation range and the lower limit is
Or through a bandpass filter for output.
A video signal processing method comprising: 15. A luminance signal, a first color difference signal, and a second color.
Video signal processing method for processing video signals including difference signals
In addition, the first color difference signal is added to or subtracted from the second color difference signal.
In this case, the first color difference signal is added to or subtracted from the second color difference signal.
A first gain control step of controlling a first amount to be calculated, and adding / subtracting the second color difference signal to / from the first color difference signal.
In this case, the second color difference signal is added to or subtracted from the first color difference signal.
A second gain control step of controlling a second amount to be calculated, and the first color difference signal and the second color difference signal within a hue range of a specific color.
2 having a degree of saturation determined from the two color difference signals, and
Look that has a value that can be distinguished from the saturation outside the phase range
The first color difference signal and the second color difference are stored in an up table.
By inputting a signal, the hue represented by the video signal
Determining whether or not is within the hue range of the specific color
And if within the hue range of the specific color, the saturation
By comparing the luminance signal with the luminance signal, a table of the video signal is obtained.
Determines whether the color saturation is within the saturation range of the specific color
And if the color is within the hue range and the saturation range of the specific color.
If the color represented by the video signal is in the specific color area
Outputting a detection signal indicating that the color is saturated, and comparing the saturation with a representative value of the saturation range of the specific color.
And the saturation is greater than a representative value of the saturation range of the specific color.
Is larger than the upper limit of the saturation range of the specific color and the
The difference from the saturation is output as a correction amount, and the saturation is
If the saturation is smaller than the representative value of the saturation range of the specific color,
The difference between the sum and the lower limit of the saturation range of the specific color is the correction amount.
And the first gain control step according to the magnitude of the correction amount.
The first amount and the second gain control step in
Controlling the second quantities independently of each other,
Color complement for the color represented by the video signal in the color area
Performing a correction.
Processing method. 16. A luminance signal, a first color difference signal, and a second color.
Video signal processing method for processing video signals including difference signals
In addition, the first color difference signal is added to or subtracted from the second color difference signal.
In this case, the first color difference signal is added to or subtracted from the second color difference signal.
A first gain control step of controlling a first amount to be calculated, and adding / subtracting the second color difference signal to / from the first color difference signal.
In this case, the second color difference signal is added to or subtracted from the first color difference signal.
A second gain control step of controlling a second amount to be calculated, and the first color difference signal and the second color difference signal within a hue range of a specific color.
2 having a degree of saturation determined from the two color difference signals, and
Look that has a value that can be distinguished from the saturation outside the phase range
The first color difference signal and the second color difference are stored in an up table.
By inputting a signal, the hue represented by the video signal
Determining whether or not is within the hue range of the specific color
And if within the hue range of the specific color, the saturation
By comparing the luminance signal with the luminance signal, a table of the video signal is obtained.
Determines whether the color saturation is within the saturation range of the specific color
And if the color is within the hue range and the saturation range of the specific color.
If the color represented by the video signal is in the specific color area
Outputting a detection signal indicating that the color is saturated, and comparing the saturation with a representative value of the saturation range of the specific color.
And the saturation is greater than a representative value of the saturation range of the specific color.
Is larger than the upper limit of the saturation range of the specific color and the
The difference from the saturation is output as a correction amount, and the saturation is
If the saturation is smaller than the representative value of the saturation range of the specific color,
The difference between the sum and the lower limit of the saturation range of the specific color is the correction amount.
And outputting the correction amount in accordance with the size of the sliced output.
The first amount and the second amount in one gain control step.
Independently controlling the second amounts in the gain control step
And a table of the video signal in the area of the specific color.
Performing a color correction for the passing color.
Characteristic video signal processing method. 17. A luminance signal, a first color difference signal, and a second color.
Video signal processing method for processing video signals including difference signals
In addition, the first color difference signal is added to or subtracted from the second color difference signal.
In this case, the first color difference signal is added to or subtracted from the second color difference signal.
A first gain control step of controlling a first amount to be calculated, and adding / subtracting the second color difference signal to / from the first color difference signal.
In this case, the second color difference signal is added to or subtracted from the first color difference signal.
A second gain control step of controlling a second amount to be calculated, and the first color difference signal and the second color difference signal within a hue range of a specific color.
2 having a degree of saturation determined from the two color difference signals, and
Look that has a value that can be distinguished from the saturation outside the phase range
The first color difference signal and the second color difference are stored in an up table.
By inputting a signal, the hue represented by the video signal
Determining whether or not is within the hue range of the specific color
And if within the hue range of the specific color, the saturation
By comparing the luminance signal with the luminance signal, a table of the video signal is obtained.
Determines whether the color saturation is within the saturation range of the specific color
And if the color is within the hue range and the saturation range of the specific color.
If the color represented by the video signal is in the specific color area
Outputting a detection signal indicating that the color is saturated, and comparing the saturation with a representative value of the saturation range of the specific color.
And the saturation is greater than a representative value of the saturation range of the specific color.
Is larger than the upper limit of the saturation range of the specific color and the
The difference from the saturation is output as a correction amount, and the saturation is
If the saturation is smaller than the representative value of the saturation range of the specific color,
The difference between the sum and the lower limit of the saturation range of the specific color is the correction amount.
And outputting the correction amount according to the magnitude of the nonlinearly converted output.
The first amount and the second amount in the first gain control step;
In the two gain control steps, the second quantities are
Control of the video signal in the specific color area.
Performing color correction for the color to be represented.
A video signal processing method comprising: 18. A luminance signal, a first color difference signal, and a second color.
Video signal processing method for processing video signals including difference signals
In addition, the first color difference signal is added to or subtracted from the second color difference signal.
In this case, the first color difference signal is added to or subtracted from the second color difference signal.
A first gain control step of controlling a first amount to be calculated, and adding / subtracting the second color difference signal to / from the first color difference signal.
In this case, the second color difference signal is added to or subtracted from the first color difference signal.
A second gain control step of controlling a second amount to be calculated, and the first color difference signal and the second color difference signal within a hue range of a specific color.
2 having a degree of saturation determined from the two color difference signals, and
Look that has a value that can be distinguished from the saturation outside the phase range
The first color difference signal and the second color difference are stored in an up table.
The hue represented by the video signal is changed by inputting the signal.
Determining whether the color is within the hue range of the specific color; and
By comparing the luminance signal with the luminance signal, a table of the video signal is obtained.
Determines whether the color saturation is within the saturation range of the specific color
And if the color is within the hue range and the saturation range of the specific color.
If the color represented by the video signal is in the specific color area
Outputting a detection signal indicating that the color is saturated, and comparing the saturation with a representative value of the saturation range of the specific color.
And the saturation is greater than a representative value of the saturation range of the specific color.
Is greater than the upper limit of the saturation range of the specific color and the
The difference from the saturation is output as a correction amount, and the saturation is
If the saturation is smaller than the representative value of the saturation range of the specific color,
The difference between the sum and the lower limit of the saturation range of the specific color is the correction amount.
And outputting the correction amount according to the magnitude of the output that has been filtered.
The first amount and the first amount in the first gain control step;
Each of the second quantities in the second gain control step is
Independently controlling the video signal in the specific color area
Performing a color correction for the color represented by
And a video signal processing method. 19. The video signal processing according to claim 11, wherein
The content of the lookup table in the method is the first color difference
A specific color to the saturation determined from the signal and the second color difference signal
Hue range identification flag to distinguish between inside the hue range and outside the hue range
Be one obtained by adding, the first color difference signal and the second color difference signal is the specific
The first color difference of m bits when within the hue range of the color
Signal and the upper n bits of the m-bit second color difference signal
, And input each into the lookup table,
The output value output from the lookup table is m-
A state that is increased by n bits is set as the first saturation.
And the lower mn bits of the first color difference signal and
The lower mn bits of the second color difference signal
Second degree of saturation obtained by inputting to the above lookup table
Is added to the first saturation to obtain the first color difference signal.
And a step of setting the saturation to be determined from the second color difference signal.
And a video signal processing method. 20. The video signal processing according to claim 11,
The content of the lookup table in the method is the first color difference
A specific color to the saturation determined from the signal and the second color difference signal
Hue range identification flag to distinguish between inside the hue range and outside the hue range
Be one obtained by adding, the first color difference signal and the second color difference signal is the specific
The first color difference of m bits when within the hue range of the color
Signal and the upper n bits of the m-bit second color difference signal
, And input each into the lookup table,
The output value output from the lookup table is m-
stearyl to what has been increased by n bits to the first saturation degree
And the lower mn bits of the first color difference signal and
The lower mn bits of the second color difference signal are compared with the comparator by the comparator.
The larger one is added to the first degree of saturation.
Determined from the first color difference signal and the second color difference signal
Video signal characterized by including a step of setting a degree of saturation
Processing method.