JPH0832984A - Hue and color saturation adjustment circuit - Google Patents

Abstract

(57) [Abstract] [Purpose] Automatically adjust the hue and saturation of TV receivers. [Configuration] Hue and color saturation adjustment reference values are stored in a storage unit 8. At the time of adjusting the hue etc., the color signal separating unit 5 separates the color (C) signal from the color bar signal of the reference signal generating unit 4 and applies it to the b terminal of the switch 6 and tilts the switch to the b side to output the C signal. To the video signal processing circuit 1 and matrixed with the Y signal into R, G and B signals, and the A / D conversion unit 2
Is converted into a digital signal and output. Color signal detector 7
The Ye signal component and the G signal component of the B signal from the A / D conversion unit are detected by the, and input to the comparison unit 9 and read from the storage unit 8 Ye.
The signal and the reference value of the G signal are compared. Based on the signal from the comparison unit, the control unit 10 outputs a signal to the hue adjustment circuit and the color saturation adjustment circuit of the video signal processing circuit to change the hue and the saturation. After completing the adjustment, return the switch to the a side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hue and color saturation adjusting circuit for a color television receiver, and more particularly to an automatic hue and saturation adjusting circuit.

[0002]

2. Description of the Related Art The hue and color saturation of a color television receiver (hereinafter abbreviated as "receiver") are adjusted by, for example, inputting a required color bar signal to the receiver, and adjusting the B The levels of the Ye (yellow) signal component and the G (green) signal component in the (blue) signal output are adjusted to have a predetermined difference from the reference level (black level or the like). That is, the hue is determined by the difference (b) between the Ye signal component and the G signal component, and the color saturation is the difference (a) between the black level and the Ye signal level.
Depends on However, the level of Ye (G) and G (Ye)
The levels of 1 influence each other by the adjustment, and the level of the other changes when the level of one changes, so the adjustment must be repeated alternately, which makes the adjustment work complicated.

[0003]

In view of such a point, the present invention stores the reference values for the adjustment of the hue and the saturation, which are appropriately set in advance, and when the hue and the saturation are adjusted,
A desired color bar signal is input to the color signal input terminal of the video signal processing circuit, and the video signal processing circuit is controlled so that the signal component corresponding to the above-mentioned reference contained in the B output matches the reference value. The point is to adjust the saturation automatically.

[0004]

In order to solve the above-mentioned problems, the present invention provides a video signal processing circuit for inputting a color video signal, processing it to an appropriate hue / saturation degree, and outputting it. A color signal detection unit that detects a desired color signal component from the output signal of, a storage unit that stores reference values of hue and saturation, and a signal from the color signal detection unit that is compared with the reference value read from the storage unit. And a control unit that controls the video signal processing circuit, the color signal detection unit, the storage unit, and the comparison unit, and controls the video signal processing circuit based on the signal from the comparison unit to obtain a desired hue. A hue and color saturation adjusting circuit adapted to adjust the color saturation is provided.

[0005]

With the above construction, in the hue and color saturation adjusting circuit according to the present invention, the required color bar signal is input to the video signal processing circuit, and the output B signal is input to the color signal detecting section. Then, the Ye signal component and the G signal component included in the B signal are detected and input to the comparison unit, respectively, and read from the storage unit. The reference value or G of the Ye signal set for adjustment of the hue and the saturation is read. Compare each with the reference value of the signal. Then, the hue adjustment circuit and the color saturation adjustment circuit of the video signal processing circuit are controlled on the basis of the signal from the comparison unit, and the desired hue is processed to a desired color saturation and output.

[0006]

Embodiments of the hue and saturation adjusting circuit according to the present invention will be described in detail. FIG. 1 is a block diagram of an essential part of an embodiment of a hue and saturation adjusting circuit according to the present invention. In the figure, reference numeral 1 denotes a video signal processing circuit, which inputs an analog luminance signal (Y) and a color signal (C), processes them to an appropriate hue and color saturation, and matrixes them into three color signals of R, G and B. And output. Reference numeral 2 denotes an A / D converter which converts each analog R, G, B color signal from the video signal processing circuit 1 into a digital signal and outputs the digital signal from the output terminal 3.
Reference numeral 4 is a reference signal generator, which outputs a required color bar signal, for example. A color signal separation unit 5 separates the color signals of the signals from the reference signal generation unit 4. Reference numeral 6 denotes a switch, which is a service switch provided for adjusting the receiver, and is switched to the b side when adjusting the hue and saturation, and the color signal from the color signal separation unit 5 is input to the C signal input terminal of the color signal processing circuit 1. After adjusting the hue and color saturation, switch to the a side. A color signal detector 7 detects the Ye signal component and the G signal component of the B signal output from the A / D converter 2. A storage unit 8 stores the reference value of the Ye signal and the reference value of the G signal, which are set for adjusting the hue and the color saturation. Reference numeral 9 denotes a comparison unit, which is a color signal detection unit 7
Ye signal component and G signal component from
The signal reference value and the G signal reference value are respectively compared. Reference numeral 10 denotes a control unit, which is a hue adjustment circuit and a color saturation adjustment circuit of the video signal processing circuit 1 based on the signal from the comparison unit 9 when the switch 6 is switched to the b side (in the hue / color saturation adjustment mode). The control signal is sent to and the hue and color saturation are changed.

Next, the operation of the hue and color saturation adjusting circuit according to the present invention will be described. The storage unit 8 stores the reference level of the Ye signal and the reference level of the G signal as shown in FIG. These correspond to the levels of the Ye signal and the G signal of the color bar signal shown in FIG. 3, respectively, and are set in advance in consideration of the specifications of the receiver or the color development characteristics of the display body. When adjusting the hue and the color saturation, the switch 6 is turned on to the b side (service side). Then, the color signal output from the reference signal generator 4 and separated by the color signal separator 5 is applied to the terminal b. The color (C) signal is converted into R, G, and
The B signal is matrixed, sent to the A / D conversion unit 2, converted into a digital signal, and output from the terminal 3. The B signal from the A / D conversion unit 2 is input to the color signal detection unit 7, the Ye signal component and the G signal component included in the B signal output are respectively detected, and input to the comparison unit 9 via the control unit 10. . Then, the reference levels of the Ye signal and the G signal are read from the storage unit 8 via the control unit 10, input to the comparison unit 9 and compared with the signals of the respective colors from the color signal detection unit 7, and a signal corresponding to the difference is output. To do. Based on the signal from the comparison unit 9, the control unit 10 sends a signal to the hue adjustment circuit and the color saturation adjustment circuit of the video signal processing circuit 1 to change the hue and the saturation. At the end of adjustment, push switch 6 to side a. In addition,
By outputting the Ye reference signal and the G reference signal stored in the storage unit 8 during the entire scanning period of the required horizontal scanning line (inputting to the comparison unit 9), any timing can be obtained within this period. Therefore, the signal from the color signal detection unit 7 may be compared, and the circuit configuration can be simplified.

[0008]

As described above, according to the hue and saturation adjusting circuit of the present invention, if the service switch of the receiver is tilted to the service side and a desired color bar signal is applied, the hue adjusting circuit can be applied. Also, since the color saturation adjustment circuit is automatically adjusted, it is possible to save the trouble of adjusting the hue and the saturation, which conventionally has to be repeated many times.

[Brief description of drawings]

FIG. 1 is a block diagram of a main part of an embodiment of a hue and color saturation adjusting circuit according to the present invention.

FIG. 2 is an example of a reference signal for adjusting hue and color saturation.

FIG. 3 is an example of a color bar signal (B signal) for explaining the operation of the hue and saturation adjusting circuit according to the present invention.

[Explanation of symbols]

 1 Video signal processing circuit 2 A / D conversion unit 4 Reference signal (color bar signal) generation unit 5 Color signal separation unit 7 Color signal (yellow, green) separation unit 8 Storage unit (Yellow, green reference signal) 9 Comparison unit 10 Control unit

Claims (4)

[Claims] 1. A color video signal is input and an appropriate hue
A video signal processing circuit for processing and outputting to a color saturation level, a color signal detecting section for detecting a required color signal component from an output signal of the video signal processing circuit, and a storage section for storing reference values of hue and color saturation. And a comparison unit that compares the signal from the color signal detection unit with a reference value read from the storage unit, and a control unit that controls the video signal processing circuit, the color signal detection unit, the storage unit, and the comparison unit. A hue and saturation adjustment circuit that controls the video signal processing circuit based on the signal from the comparison unit and adjusts it to the required hue and saturation. 2. An A / D converter is provided to convert an output signal of the video signal processing circuit into a digital signal,
2. The hue and color saturation adjusting circuit according to claim 1, wherein the color signal detecting section detects a required color signal component by digital processing from the output signal of the A / D converting section and inputs it to the comparing section. 3. The adjustment reference values of the yellow signal and the green signal are stored in the storage unit, and the color signal detection unit detects the yellow signal component and the green signal component from the blue signal output of the video signal processing circuit, respectively. 3. The hue and color saturation adjusting circuit according to claim 1 or 2, wherein the comparison unit compares the reference value of the corresponding color signal from the storage unit. 4. The hue and color saturation adjustment circuit according to claim 3, wherein the adjustment reference value signals of the yellow signal and the green signal are applied to the comparison unit during the entire scanning period of a required horizontal scanning line. .