JP2000312366A - Motion detection circuit for adaptive yc separation and method for detecting its motion - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motion detection circuit that an realize a motion with high precision to operate adaptive YC separation with high quality as an image processing unit. SOLUTION: A frame difference arithmetic section 1 calculates a motion component and a color difference signal component of a luminance signal by a frame difference and a band pass filter 2 extracts a motion component of a leaked color difference signal. 1H delay sections 3-5 and sbutractors 6-9 obtain a difference of the signals to extract a motion component (2-line data) of the luminance signal with high precision. A comparator-section 10 compares 2-line data and outputs a value of the data which is smaller as a motion coefficient of the luminance signal. A 2-frame difference arithmetic section 11 and a 1H delay section 12 calculate a motion coefficient of a color difference signal with high precision by a 2-frame difference with color correlation. A comparator section (MAX) 13 compares a maximum value of the motion coefficient of the luminance signal with that of the motion coefficient of the color difference signal and outputs a maximum value which is higher as a motion coefficient.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motion detection circuit for adaptive YC separation and a method for detecting the motion, and more particularly to a motion detection circuit for adaptive YC separation in an image processing apparatus.

[0002]

2. Description of the Related Art Conventionally, as a method of separating an input digital composite video signal into a luminance signal (Y signal) and a color difference signal (C signal) (YC separation method), a line comb filter, a band pass filter, or There are a two-dimensional YC separation method such as a logical comb filter and a three-dimensional YC separation method using the opposite polarity of the burst phase between frames. In the adaptive YC separation, these two types of methods are adaptively switched to obtain a luminance signal and a color difference signal. Are separated.

The motion detection circuit for performing the above-described adaptive YC separation determines the degree of motion by adjusting the remaining number calculated from the difference between frames by coring gain adjustment. However, if there is a component in which the luminance signal leaks into the color difference signal or a component in which the color difference signal leaks into the luminance signal, accurate motion detection cannot be performed.

The above-described motion-adaptive YC separation method is used not only for image processing apparatuses but also for televisions.
The YC separation method in this television is disclosed in Japanese Patent Application Laid-Open Nos. H2-177791 and H4-211595.
JP, JP-A-4-306997, JP-A-7-1
No. 07510 and the like.

[0005]

In the above-described conventional motion detection circuit for adaptive YC separation, in a composite video signal in which a luminance signal and a chrominance signal intersect, a component in which the luminance signal leaks to the chrominance signal and a chrominance component are included. Since a component in which a signal leaks into a luminance signal or the like is not considered in subtraction between frames, highly accurate motion detection cannot be performed.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems and to realize an adaptive YC separation capable of realizing high-precision motion detection for operating a high-quality adaptive YC separation as an image processing apparatus. And a motion detection method therefor.

[0007]

SUMMARY OF THE INVENTION An adaptive YC according to the present invention.
A motion detection circuit for separation is a motion detection circuit for adaptive YC separation for separating an input digital composite video signal into a luminance signal and a color difference signal, and monitors a correlation between the digital composite video signals. Detecting means for detecting a portion having no correlation as motion.

[0008] A motion detection method for adaptive YC separation according to the present invention is a motion detection method for adaptive YC separation for separating an input digital composite video signal into a luminance signal and a color difference signal. A step of monitoring the correlation of the video signal of the digital composite and detecting a portion having no correlation as motion.

That is, the motion detection circuit for adaptive YC separation of the present invention further performs horizontal and vertical filtering of the result subtracted between frames, and leaks between the luminance signal and the chrominance signal. Removes components with This enables more accurate luminance component motion detection. Further, by performing subtraction between two frames having color correlation, it is possible to more accurately detect the motion of a color component than by performing subtraction between frames.

More specifically, in the motion detecting circuit for adaptive YC separation of the present invention, first, a motion component and a color difference signal component of a luminance signal are calculated based on a frame difference, and the signal is subjected to a band-pass filter in a horizontal direction. Then, a color difference signal component is extracted by passing through a two-dimensional line comb.

The chrominance signal component is subtracted from the signal consisting of the motion component of the luminance signal and the chrominance signal component to obtain the motion component of the luminance signal with high accuracy. That is, a band emission filter is formed.

There are two types of data calculated by the above-described two-dimensional line comb in the data that has passed through the band illumination filter, and one of the two types of data is used as the motion coefficient of the luminance signal. Output.

On the other hand, a motion coefficient of a color difference signal having higher accuracy than data obtained by simply extracting color components is calculated based on a two-frame difference having a color correlation, and a motion coefficient of the luminance signal and a motion coefficient of the color difference signal are calculated. The switching point has a width so that the larger value of the two can be applied sequentially instead of steeply.
In addition, a result obtained by performing field correlation in preparation for a scene with many changes is output as a motion coefficient.

By obtaining the motion coefficient by the above processing, it is possible to realize highly accurate motion detection for operating the high quality adaptive YC separation as the image processing apparatus.

[0015]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a motion detection circuit for adaptive YC separation according to an embodiment of the present invention. In FIG. 1, a motion detection circuit for adaptive YC separation according to one embodiment of the present invention includes a frame difference calculation unit 1, a band-pass filter (BPF) 2, 1H delay units 3 to 5, 12, and a subtractor. 6 to 9 and the comparison unit (MI
N) 10, a two-frame difference calculation unit 11, and a comparison unit (M
AX) 13.

The frame difference calculation unit 1 calculates a motion component and a chrominance signal component (data A) of a luminance signal by calculating a frame difference with respect to an input digital composite video signal. It passes through the pass filter 2 and a two-dimensional line comb to obtain a motion component (data B) of the leaked color difference signal.

Thereafter, the 1H delay units 3 to 5 and the subtractor 6
-9, the difference between the data A and the data B is obtained (vertical line comb filter processing), and the high-precision luminance signal motion components (two-line data D1, D2) is extracted.

The comparison unit (MIN) 10 has two lines of data D1 and D branched by vertical line comb filtering.
2 are compared, and the smaller value is output as the motion coefficient (data E) of the luminance signal. In this case, erroneous detection of a color edge can also be prevented.

On the other hand, the two-frame difference calculation units 11 and 1H
The delay unit 12 calculates the motion coefficient (data F) of the color difference signal with higher accuracy than the data obtained by simply extracting the color component, based on the two-frame difference having the color correlation of the input digital composite video signal. This data F is obtained as a motion coefficient of a color difference signal with higher accuracy than the above-described data B obtained by simply extracting a color component.

The comparison unit (MAX) 13 compares the maximum value of the motion coefficient (data E) of the luminance signal with the maximum value of the motion coefficient (data F) of the color difference signal, and compares the larger value with the motion coefficient (data G). ).

The data G can be naturally switched by providing a gradual switching characteristic near the boundary between a moving part and a non-moving part by providing a width of several pixels at both ends in the horizontal direction. The re-comparison is performed in units of fields so as to cope with a case where the movement is so severe that it cannot be detected between the two frames, and the result of the field correlation is used as the final motion coefficient.

FIG. 2 shows an adaptive YC according to an embodiment of the present invention.
5 is a flowchart illustrating an operation of a motion detection circuit for separation. The operation of the motion detection circuit for adaptive YC separation according to one embodiment of the present invention will be described with reference to FIGS.

A frame difference calculation unit 1 calculates a motion component and a color difference signal component (data A) of a luminance signal based on a frame difference of an input digital composite video signal, and converts the data A to a band-pass filter 2 in a horizontal direction. After passing through a two-dimensional line comb, a motion component (data B) of the leaked color difference signal is obtained (step S2 in FIG. 2).

The motion component (data B) of the leakage color difference signal
Can pass through a horizontal band-pass filter 2 and a two-dimensional vertical line comb to form and remove a band illumination filter, thereby extracting only a motion component of a luminance signal (FIG. Two steps S3).

The two lines of data D1 and D2 that have passed through the illumination filter select a smaller value in the comparing unit (MIN) 10 in order to prevent erroneous detection due to the vertical edge of the color difference signal component that is not completely removed. Then, it is output as a motion coefficient (data E) of the luminance signal (step S4 in FIG. 2).

On the other hand, the two-frame difference calculation units 11 and 1H
The delay unit 12 calculates the motion coefficient (data F) of the color difference signal with higher precision than the data obtained by simply extracting the color component, based on the two-frame difference having the color correlation of the input digital composite video signal (FIG. 2). Step S5). This data F is obtained as a motion coefficient of a color difference signal with higher accuracy than the above-described data B obtained by simply extracting a color component.

The comparing unit (MAX) 13 compares the maximum value of the motion coefficient (data E) of the luminance signal with the maximum value of the motion coefficient (data F) of the color difference signal (step S6 in FIG. 2), and selects the larger value. Is output as a motion coefficient (data G) (step S7 in FIG. 2).

However, if the moving part and the non-moving part are suddenly switched, the boundary line, on which the two-dimensional side should be selected in the case of movement, becomes pictorially blurred while remaining three-dimensional. Will exist.

In consideration of the above points, the adaptive switching is naturally performed by providing a width corresponding to several pixels at both ends in the horizontal direction, and furthermore, when the movement is so severe that it cannot be detected between one and two frames. , The field correlation can also be considered by re-comparing every field.

FIG. 3 shows an adaptive Y according to another embodiment of the present invention.
It is a block diagram which shows the structure of the motion detection circuit for C separation. In FIG. 3, a motion detecting circuit for adaptive YC separation according to another embodiment of the present invention includes a gain adjusting unit 14,
The same configuration as the motion detection circuit for adaptive YC separation according to one embodiment of the present invention shown in FIG. 1 except that a horizontal pixel enlargement unit 15, a field delay unit 16, and a comparison unit (MAX) 17 are provided. The same components are denoted by the same reference numerals. The operation of the same component is the same as the operation of the motion detection circuit for adaptive YC separation according to one embodiment of the present invention.

FIG. 4 shows an adaptive Y according to another embodiment of the present invention.
9 is a flowchart illustrating an operation of a motion detection circuit for C separation. 4, steps S11 to S17 are the same processing as steps S1 to S7 in FIG. These figures 3
4 and FIG. 4, an adaptive Y according to another embodiment of the present invention.
The operation of the motion detection circuit for C separation is different from the operation of the motion detection circuit for adaptive YC separation according to one embodiment of the present invention.

A motion detecting circuit for adaptive YC separation according to an embodiment of the present invention is a general band-pass filter 2.
Is used to provide a width to the motion detection result using a line comb filter. However, there are several possible values of the tap / coefficient characteristics of the filter and the width of the motion detection result. This is an appropriate value depending on the number of operation bits, processing speed, and the like.

In the motion detection circuit for adaptive YC separation according to another embodiment of the present invention, a line after data G is provided with a gain adjusting section 14 so that an adaptive switching threshold level can be set.

That is, the motion coefficient (data G) output from the comparison unit (MAX) 13 is subjected to gain adjustment by the gain adjustment unit 14 (step S 18 in FIG. 4), and the horizontal pixels are expanded by the horizontal pixel expansion unit 15. Is field-delayed by the field delay unit 16 (step S19 in FIG. 4).

The comparison unit (MAX) 17 is a horizontal pixel enlargement unit 1
5. Data with horizontal pixels enlarged in 5 and field delay unit 1
Re-comparison is performed with the data field-delayed in step 6, that is, for each successive field (step S20 in FIG. 4), and the larger value is output as a motion coefficient (step S21 in FIG. 4). Thereby, the field correlation can also be considered.

As described above, by utilizing the properties of a luminance signal and a color difference signal between frames and removing a leak component resulting from mutual influence of the correlation, and calculating a motion coefficient, a more accurate adaptive type is obtained. Motion detection for YC separation can be performed. Therefore, highly accurate motion detection for operating the high quality adaptive YC separation as the image processing apparatus can be realized.

[0037]

As described above, according to the present invention, in the motion detection for adaptive YC separation in which an input digital composite video signal is separated into a luminance signal and a color difference signal, the digital composite video signal is detected. By monitoring the correlation and detecting a portion having no correlation as motion, there is an effect that highly accurate motion detection for operating a high-quality adaptive YC separation as an image processing apparatus can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a motion detection circuit for adaptive YC separation according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating an operation of a motion detection circuit for adaptive YC separation according to an embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a motion detection circuit for adaptive YC separation according to another embodiment of the present invention.

FIG. 4 is a flowchart illustrating an operation of a motion detection circuit for adaptive YC separation according to another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 frame difference calculation unit 2 bandpass filter 3-5, 12 1H delay unit 6-9 subtracter 10 comparison unit (MIN) 11 2 frame difference calculation unit 13, 17 comparison unit (MAX) 14 gain adjustment unit 15 horizontal pixel enlargement Part 16 Field delay part

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5C057 AA11 BA02 DB06 EA05 EC01 ED09 EG05 GC03 GC06 GE01 GH01 GJ01 GK02 5C066 AA11 BA02 BA20 CA08 DC01 EF11 EF16 GA04 GA27 GB01 KA12 KC04 KC06 KD01 KE02 LA02

Claims (8)

[Claims] 1. A motion detection circuit for adaptive YC separation for separating an input digital composite video signal into a luminance signal and a color difference signal, wherein the motion detection circuit monitors the correlation of the digital composite video signal and detects the correlation. A motion detection circuit, comprising: detection means for detecting a non-existent portion as motion. 2. The motion according to claim 1, wherein the detection means has a width corresponding to several pixels at both ends in the horizontal direction with respect to the detected motion, and performs the adaptive switching naturally. Detection circuit. 3. The method according to claim 1, wherein the detecting unit calculates a motion component and a chrominance signal component of the luminance signal based on a frame difference of the video signal of the digital composite, and detects the motion component and the chrominance signal component of the luminance signal. Means for extracting a chrominance signal component; means for subtracting the chrominance signal component from a signal consisting of the motion component and the chrominance signal component of the luminance signal to obtain motion components of a plurality of luminance signals; Means for outputting a smaller value of the components as a motion coefficient of a luminance signal; means for calculating a motion coefficient of a color difference signal based on a two-frame difference having a color correlation of the video signal of the digital composite; Means for outputting a larger one of a motion coefficient and a motion coefficient of the color difference signal as a motion coefficient. The motion detection circuit according to claim 1. 4. The means for performing gain adjustment on the motion coefficient, the means for performing re-comparison of the signal subjected to the gain adjustment for each field, and outputting a larger value as a motion coefficient. 4. The method according to claim 3, wherein
The motion detection circuit as described. 5. A motion detection method for adaptive YC separation for separating an input digital composite video signal into a luminance signal and a color difference signal, wherein the correlation is monitored by monitoring the correlation of the digital composite video signal. A motion detecting method, comprising the step of detecting a missing portion as motion. 6. The step of detecting an uncorrelated portion as a motion is characterized in that the detected motion has a width corresponding to several pixels at both ends in the horizontal direction, and the adaptive switching is naturally performed. The motion detection method according to claim 5, wherein 7. The step of detecting the uncorrelated portion as motion includes calculating a motion component and a chrominance signal component of a luminance signal based on a frame difference of the video signal of the digital composite; Extracting the chrominance signal component of the signal comprising the chrominance signal component; and subtracting the chrominance signal component from the signal comprising the motion component and the chrominance signal component of the luminance signal to obtain motion components of a plurality of luminance signals. Outputting a smaller value among the motion components of the plurality of luminance signals as a motion coefficient of the luminance signal; and calculating a motion coefficient of the color difference signal by a two-frame difference having a color correlation of the video signal of the digital composite. Calculating, the larger of the motion coefficient of the luminance signal and the motion coefficient of the color difference signal. 7. The method according to claim 5, further comprising: outputting the value as a motion coefficient. 8. The step of detecting the uncorrelated portion as motion includes the step of performing gain adjustment on the motion coefficient and the step of performing a re-comparison of the gain-adjusted signal for each field to determine the larger one. Outputting the value as a motion coefficient.