JPH0746477A - Title picture data generating circuit - Google Patents

Abstract

PURPOSE:To extract a specific picture without inconvenience from a luminance signal and a chrominance difference signal. CONSTITUTION:Level of a digitized luminance signal and two digitized color difference signals R-Y, B-Y is compared with an upper limit and a lower limit set corresponding to each signal by comparator circuits 15-20. Each output of the comparator circuits is given to AND circuits 30, 32, 34, 36 to extract three signals between said upper limit and said lower limit (luminance signal Y and color difference signals R-Y, B-Y) thereby extending a selection width of title picture data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a title image data generation circuit used in a video color camera or the like.

[0002]

2. Description of the Related Art Conventionally, in a camera-integrated VTR or the like,
A character generator is provided to provide a superimpose function for inserting another image signal into a video signal, the title image information is generated by the character generator, and the title image signal is inserted into the video signal by the superimpose function. Some have a titler function which is adapted to be recorded. There is also a peripheral device such as a so-called titler or telopper for superimposing title information or telop information such as image description according to the captured content on a video signal.

FIG. 3 shows an example of a conventional title image data generating circuit used in these devices. In the figure,
A color difference signal RY, which is an analog signal used for title image data, is input from the input terminal 1, a color difference signal BY is input from the input terminal 2, and a luminance signal Y is input from the input terminal 3. It is supplied to the selector 4. One of the luminance signals Y is branched and supplied to the comparator 5, where
The level is compared with the reference voltage, and a binarized signal corresponding to the level is obtained. Then, this signal is supplied to the title controller 6, and is stored in the RAM 7 as title image data through the data bus by the horizontal and vertical address signals generated based on the horizontal synchronizing signal HD and the vertical synchronizing signal VD supplied thereto. It Then, when the stored title image data is read out and inserted into the video signal at a desired time, it is read by the address signal supplied to the title controller 6 and supplied to the selector 4. In the selector 4, the color difference signals R-Y and B-
Y and the luminance signal Y are turned off, and the reference color signal is supplied instead. The reference color signal is R, R at a predetermined ratio so that the colors displayed on the screen in the title image are Mg (magenta), G (green), Cy (cyan), Ye (yellow), and the like. The G and B signals and the luminance signal (Y) are superimposed and output as a title image signal.

[0004]

By the way, in the above-mentioned conventional circuit, since the title image data is obtained using only the luminance signal, the luminance level is below a certain level.
Alternatively, there is a problem that it is not possible to distinguish a part having a different color at a certain level or higher. Therefore, the problem to be solved by the present invention is to solve the above problems.

[0005]

The circuit according to the present invention solves the above problems and has the following configuration. That is, the incoming digitized luminance signal and the first
And a title image data generation circuit for generating title image data on the basis of the second color difference signal.
Comparing each of the three signals with a first level and a second level set corresponding to each of the three signals; A title image data generating circuit for generating title image data, the extraction means including the extraction means for extracting the three signals between the first and second levels.

[0006]

The luminance signal digitized by the comparison means,
The first and second color difference signals are respectively level-compared at a first level and a second level, and based on a result of the comparison, extraction means is arranged between the first and second levels. To extract.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the title image data generation circuit of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram of the title image data generation circuit. In FIG.
Reference numerals 12 to 13 are input terminals, and 13 is a selector. One of the input terminals 10 to 12 is branched midway and connected to one end of each of the comparators 15 to 20. The other end of each of the comparators 15 to 20 has a color difference signal RY,
It is connected to input terminals 21 to 26 for inputting an upper limit value or a lower limit value of BY and the luminance signal Y.

The output side of the comparator 15 is AN
It is connected to one end side of the input of the D circuit 30, and the other end side is connected to the comparator 16 through the inverter 31. Similarly, one end of the input of the AND circuit 32 is connected to the output side of the comparator 17, and the other end is connected to the comparator 18 through the inverter 33. Similarly, one end of the input of the AND circuit 34 is connected to the output side of the comparator 19, and the other end is connected to the comparator 20 through the inverter 35. Furthermore, each of these A
The ND circuits 30, 32 and 34 are connected to the AND circuit 36. The AND circuit 36 is connected to a title controller 37, and the title controller 37 is connected to a storage circuit (RAM) 38 via a data bus and also connected to the selector 13 to form a title data generation circuit.

Next, the operation of this circuit configuration will be described in detail. When storing a desired title image, a mode for storing the title image is set by operating an operation switch (not shown). As a result, the video signal from the subject passes through the image sensor, the analog / digital conversion circuit, the brightness / color signal separation circuit, etc., and the brightness signal Y and the color difference signal R-
It is separated and converted into Y and B-Y, and comes in from the input terminals 10 to 12, respectively. The color difference signal R-Y comes from the input terminal 10, the color difference signal B-Y comes from the input terminal 11, and the luminance signal Y comes from the input terminal 12.

These incoming signals Y, RY, BY
One of the two is supplied to the selector 13 and
The color difference signals RY are supplied to the one ends of the comparators 15 and 16, respectively. The upper limit value of the color difference signal R-Y signal is input to the other end side of the comparator 15, and the lower limit value of the color difference signal R-Y is input to the other end side of the comparator 16. The comparator 15 compares the level of the color difference signal R-Y with the upper limit value, and the color difference signal R-Y is compared.
If Y is a signal equal to or lower than the upper limit value, an "H" level signal is output, and if Y is a signal equal to or higher than the upper limit value, an "L" level signal is output and supplied to one end of the input of the AND circuit 30. Will be done.

Further, the comparator 16 compares the levels of the color difference signal R-Y and the lower limit value to obtain a color difference signal R-Y.
If the Y signal is larger, the "L" level signal is output, and if the Y signal is smaller, the "H" level signal is output and supplied to the inverter 31. Then, here, an inverted signal is supplied to the other end side of the input of the AND circuit 30. Similarly, the comparator 17 compares the levels of the color difference signals BY with the upper limit value, and the output thereof is supplied to one end side of the input of the AND circuit 32. And this AND
To the other end of the circuit 32, the comparison result of the color difference signal B-Y performed by the comparator 18 and the lower limit value is supplied through the inverter 33.

Here, FIG. 2 is a vector diagram schematically showing the relationship between the color difference signal and the hue, and this figure will also be referred to.
That is, in the AND circuit 30, the required width in the BY axis direction is determined by the upper limit value and the lower limit value of the color difference signal RY, and AN
In the D circuit 32, the required width in the BY axis direction is determined by the upper limit value and the lower limit value of the color difference signal BY. That is, the area (hue and density) of a predetermined color signal is determined by these upper and lower values. For example, in FIG. 2, the area of the R (red) signal as shown by the shaded area is determined. In addition, Mg (magenta), B (blue), Cy
In order to obtain a desired color (hue and density) such as (cyan), G (green), YL (yellow), the upper and lower values of the color difference signal RY and the color difference signal BY are appropriately changed. It is obtained by And regarding the area of these color signals,
The brightness (brightness) area is obtained by the logical sum of the ND circuits 30 and 32. The brightness signal area is calculated by the AND circuit 34 based on the comparison result of the upper limit value in the comparator 19 and the lower limit value in the comparator 20. Will be decided.

Finally, these AND circuits 3
The outputs of 0, 32 and 34 are supplied to the AND circuit 36, where the hue, density and brightness are determined. That is, what kind of color, what kind of darkness, and what kind of brightness it is are determined, and the image of the corresponding color arrangement portion is extracted. Then, the extracted title image signal is output from the AND circuit 36 and supplied to the title controller 37 in the next stage. The title controller 37 is supplied with a horizontal synchronizing signal HD and a vertical synchronizing signal VD, and an image signal is stored in a predetermined area of the RAM 38 as a title image through a data bus according to horizontal and vertical addresses generated based on these signals. Will be remembered.

When it is desired to insert this title image into a desired scene, for example, a read mode is set by an operation switch (not shown). As a result, the title image data is read from the RAM 38 by the address signal generated based on the horizontal synchronizing signal HD and the vertical synchronizing signal VD supplied to the title controller 37 and supplied to the selector 13. At the same time, the selector 13 is switched so that the color difference signals RY, BY and the luminance signal Y coming from the input terminals 10 to 12 are cut off, and the reference color signal is supplied instead. This reference color signal is supplied to give a predetermined color to the title image. For example, the colors displayed on the screen are Mg (magenta), G (green), Cy (cyan), Ye (yellow). The luminance signal Y and the color difference signals R-Y and B-Y are supplied at a predetermined ratio so as to be equal to each other. When selecting a desired color, the three signals are supplied at a predetermined ratio by operating a color selection switch (not shown). Then, these signals are superimposed on the title image signal and output from the selector 13. Therefore, the title image signal with a predetermined color is output from the selector 13. Further, as a matter of course, the ratio of the color difference signals R-Y and B-Y may be set to zero and only the luminance signal may be output.

[0015]

According to the title image data generation circuit of the present invention, the title image data generation circuit generates the title image data based on the incoming digitized luminance signal and the first and second color difference signals. In comparison means for comparing each of the three signals with a first level and a second level set corresponding to each of the three signals, and a comparison result of the comparison means. Based on
And a title image data generating circuit for generating title image data, comprising: extracting means for extracting the three signals between the first and second levels. Since it is configured to generate title image data, it can be extracted without inconvenience even when a specific image is used as title image data from images with similar brightness levels, and the selection range of title image data can be expanded. Become.

[Brief description of drawings]

FIG. 1 is a block diagram of a title image data generation circuit according to an embodiment of the present invention.

FIG. 2 is a vector diagram schematically showing a relationship between a color difference signal and a hue.

FIG. 3 is a block diagram of a conventional title image generation circuit.

[Explanation of symbols]

 10-12, 21-26 Input terminal 13 Selector 15-20 Comparator 30, 32, 34, 36 AND circuit 37 Title controller 38 Storage means (RAM)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshio Oue 3-12 Moriya-cho, Kanagawa-ku, Yokohama, Kanagawa Japan Victor Company of Japan, Ltd. (72) Mori Miyashita 3-chome, Moriya-cho, Kanagawa-ku, Yokohama Address 12 Victor Company of Japan, Ltd.

Claims (1)

[Claims] 1. A title image data generation circuit for generating title image data based on an incoming digitized luminance signal and first and second color difference signals, wherein each of said three signals and said 3 Comparing means for respectively comparing a first level and a second level set corresponding to each of the two signals, and between the first and second levels based on a comparison result of the comparing means. A title image data generation circuit comprising: an extraction unit for extracting the certain three signals; and generating title image data.