JPH05191843A - Instrument for measuring color balance - Google Patents

Abstract

PURPOSE:To provide a color balance measuring instrument which measures color balance between a main image and a sub-image and adjusts the color balance of the sub-image so as to eliminate the error of the individual color balance in the color balance adjusting circuit of a color television receiver. CONSTITUTION:A test signal generator 11 supplies the test signals of the main image and the sub-image to the television receiver 12 so as to display them in CRT 13. Then, various kinds of color filters and sensors detect the light- emitting strength of red, green and blue in the main image and the sub-image so as to convert it into an electric signal. The electric signal is amplified and, then, supplied to arithmetic circuits 19 and 26 so that a voltage whose error component is removed is outputted to a voltage meters 20-22 and 27-29. The respective voltage meters measure the red light-emitting strength, green light- emitting strength and blue light-emitting strength of the main image and the sub-image. The output voltages of the arithmetic circuits 19 and 26 are outputted to comparators 30-32 so as to be compared at every color. The comparison result is adjusted so as to be zero while viewing a display device 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color balance measuring device for adjusting the color balance of a color television receiver capable of displaying a plurality of images at the same time, and more particularly to a color balance measuring a difference between the color balances of a plurality of images. Regarding measuring device.

[0002]

2. Description of the Related Art One of the characteristics showing the performance of a color television receiver is a color balance characteristic showing white display performance. This color balance characteristic can be changed by adjusting a semi-fixed resistor inside the color television receiver. This adjustment is generally called color balance adjustment or white balance adjustment, and is performed at a manufacturing factory of a color television receiver.

The structure and operation of a conventional color balance measuring device will be described below with reference to the drawings. FIG. 2 is a configuration diagram showing a configuration of a conventional color balance measuring device. In this figure, a test signal a is supplied from a test signal generator 10 to a color television receiver 12 and displayed on a CRT 13. The color wavelength of the image displayed on the CRT 13 is selected by the red optical filter Fr, the green optical filter Fg, and the blue optical filter Fb. The light passed through these filters is used for the red sensor Sr and the green sensor S, respectively.
The light emission intensity is detected by g and the blue sensor Sb and converted into electrical signals c, d, and e. These electrical signals c, d, e
Is amplified by amplifiers 16, 17 and 18 and then supplied to the arithmetic circuit 19. In the arithmetic circuit 19, the error component is removed from the supplied signal, and the voltages Vr, Vg, Vb are measured by the voltmeter 2.
It is output to 0, 21, 22. Voltmeter 20, 21, 22
Then, the red emission intensity, the green emission intensity, and the blue emission intensity are measured from the supplied voltage, respectively. This measurement result shows the color balance state of the color television receiver 12.

In a color television receiver manufacturing plant, the optimum value of color balance is standardized, and the color television is set so that the measured values of the respective voltmeters 20, 21, 22 fall within the standardized range. The semi-fixed resistor inside the John receiver 12 is adjusted.

Next, the arithmetic circuit 19 described above with reference to FIG.
The configuration and operation of will be described. In FIG. 3, the output of the amplifier 16 is supplied to the positive terminal of the arithmetic unit 40, the negative terminal of the arithmetic unit 41 via the variable resistor 45, and the negative terminal of the arithmetic unit 42 via the variable resistor 47. It The output of the amplifier 17 is supplied to the positive terminal of the arithmetic unit 41, and
It is supplied to the negative terminal of the arithmetic unit 40 via the variable resistor 43 and to the negative terminal of the arithmetic unit 42 via the variable resistor 48. The output of the amplifier 18 is supplied to the positive terminal of the arithmetic unit 42, and also to the negative terminal of the arithmetic unit 40 via the variable resistor 44.
It is supplied to the negative terminal of the arithmetic unit 41 via the variable resistor 46.

The above-mentioned optical filters Fr and Fg for each color
, Fb, there is a difference between the center of the pass band wavelength and the phosphor emission wavelength of the CRT 13. For this reason, the output signals of the optical filters Fr, Fg, and Fb for each color include light having a wavelength other than the detection purpose, which causes a measurement error. Therefore, each computing unit 40, 41, 42 removes the measurement error by subtracting the voltage supplied to the two negative terminals from the voltage supplied to the positive terminal.

By the way, among recent color television receivers, models capable of simultaneously displaying a plurality of images are commercially available. In such a model, a main image displayed on the full screen of the CRT and a sub-image which is a fraction of the main image and is a different image from the main image are displayed simultaneously on the CRT. You can

In the color balance measurement of such a model, since there is no color balance measuring device dedicated to the sub-image, the color balance measurement and adjustment of the sub-image are performed using the measuring device for the main image. In a color television receiver that has been subjected to such color balance adjustment, an error in the color balance adjustment work occurs separately in the main image and the sub-image, and when the same image is received in the main image and the sub-image. There was a drawback that the difference in color balance was noticeable.

[0009]

Conventionally, since there is no color balance measuring device dedicated to the sub-image, the color balance of the sub-image is measured and adjusted using the measuring device for the main image.
In a color television receiver that has been subjected to such color balance adjustment, an error in the color balance adjustment work occurs separately in the main image and the sub-image, so when the same image is received in the main image and the sub-image. There was a drawback that the difference in color balance was noticeable.

The present invention has been made in view of the above problems, and measures and adjusts the color balance between the main image and the sub-image, and at the same time, measures the error of each color balance and adjusts so as to eliminate this error. It is an object of the present invention to provide a color balance measuring device for doing so.

[0011]

Means for Solving the Problems The means according to the present invention comprises a red image in a main image displayed on a color television receiver,
First detection means for detecting the emission intensity of green and blue, and red in the sub-image displayed on the color television receiver,
Second detecting means for detecting the emission intensity of green and blue, first removing means for removing the error component from the output of the first detecting means, and removing the error component from the output of the second detecting means. A main image is provided by including a second removing unit that performs the above, a comparing unit that compares the outputs of the first and second removing units for each color, and a display unit that displays the comparison result by the comparing unit. The difference in color balance with the sub-image is measured.

[0012]

The red, green, and blue emission intensities in the main image detected by the first detection means and the red, green, and blue emission intensities in the sub-image detected by the second detection means are compared by the comparison means. By comparing and displaying the comparison result, it is possible to detect the difference in color balance between the main image and the sub image.

[0013]

Embodiments will be described below with reference to the drawings. FIG. 1 is an explanatory diagram illustrating the configuration of the embodiment. The same components as those of the related art are designated by the same reference numerals. Two kinds of test signals a and b are supplied from the test signal generator 11 to the color television receiver 12 and displayed on the CRT 13. Here, the test signal a is displayed as a main image, and the test signal b is displayed as a sub image. The color wavelength of the main image displayed on the CRT 13 is selected by the red optical filter Fr1, the green optical filter Fg1, and the blue optical filter Fb1. The light that has passed through these filters enters the main image sensor 14 and the color wavelength is selected. The light passing through each filter has its emission intensity detected by the red sensor Sr1, the green sensor Sg1, and the blue sensor Sb1, and converted into electrical signals c, d, and e.

On the other hand, the sub-image displayed on the CRT 13 is subjected to color wavelength selection by the red optical filter Fr2, the green optical filter Fg2 and the blue optical filter Fb2. The light passing through these filters is made incident on the main image section sensor 15 and the color wavelength is selected. The light passing through each filter has its emission intensity detected by the red sensor Sr2, the green sensor Sg2, and the blue sensor Sb2, and converted into electrical signals f, g, and h.

The electric signals c, d and e described above are amplified by amplifiers 16, 17 and 18, respectively, and then supplied to the arithmetic circuit 19. In the arithmetic circuit 19, the error component is removed from the supplied signal, and the voltages Vr1, Vg1 and Vb1 are measured by the voltmeter 20,
It is output to 21 and 22. The voltmeters 20, 21, 22 measure red emission intensity, green emission intensity, and blue emission intensity from the supplied voltages, respectively. This measurement result shows the color balance state of the main image of the color television receiver 12.

Similarly, the electric signals f, g and h are amplified by the amplifiers 23, 24 and 25, respectively, and then supplied to the arithmetic circuit 26. In the arithmetic circuit 26, the error component is removed from the supplied signal, and the voltages Vr2, Vg2 and Vb2 are measured by the voltmeters 27 and 2.
It is output to 8 and 29. The voltmeters 27, 28, and 29 measure the red emission intensity, the green emission intensity, and the
The blue emission intensity is measured. This measurement result shows the color balance state of the sub-images of the color television receiver 12.

Of the output voltages of the arithmetic circuits 19 and 26, Vr1 and Vr2 are for the comparator 30, and Vg1 and Vg2 are for the comparator 3.
1 and Vb1 and Vb2 are supplied to the comparator 32, respectively. The supplied voltages are compared by these comparators 30, 31, 32, and the respective comparison results i, j, k are output to the display device 33. In the display device 33, the comparison result i,
j and k are displayed as numbers, for example.

By the way, in the manufacturing factory of the color television receiver, the optimum value of the color balance is standardized so that the measured values of the voltmeters 20 to 22 and 27 to 29 are within the standardized range. Then, the semi-fixed resistors inside the color television receiver 12 are adjusted. Then, the semi-fixed resistor for adjusting the color balance of the sub-image portion of the color television receiver 12 is adjusted so that the comparison result i, j, k displayed on the display device 33 becomes zero. As a result, an error due to the color balance adjustment work between the main image and the sub image is eliminated, and it is possible to provide a color television receiver having no difference in color balance when the same image is received as the main image and the sub image.

As described above, after the color balance between the main image portion and the sub-image portion is individually adjusted, the color balance between the main image portion and the sub-image portion is adjusted by adjusting the color balance of the sub-image portion to that of the main image portion. It is possible to provide a color television receiver in which the error due to the balance adjustment work is eliminated and there is no difference in color balance when the same image is received as the main image and the sub image.

[0020]

As described above, after the color balance of the main image portion and the sub image portion is individually adjusted, the color balance of the sub image portion is adjusted to that of the main image portion. As a result, an error due to the color balance adjustment work between the main image and the sub image is eliminated, and a color television receiver having no difference in color balance even when the same image is received by the main image and the sub image can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of the present invention.

FIG. 2 is a configuration diagram showing a conventional configuration.

FIG. 3 is a configuration diagram showing an internal configuration of an arithmetic circuit 19.

[Explanation of symbols]

 11 ... Test signal generator 12 ... Color television receiver 13 ... CRT 16-18,23-25 ... Amplifier 19,26 ... Operation circuit 20-22,27-29 ... Voltmeter 30-32 ... Comparator 33 ... Display apparatus

Claims (1)

[Claims] 1. A first detecting means for detecting emission intensities of red, green and blue in a main image displayed on a color television receiver, and red, green in a sub-image displayed on the color television receiver. Second detecting means for detecting the blue emission intensity, and first for removing an error component from the output of the first detecting means.
And a second removing means for removing an error component from the output of the second detecting means.
The color balance measuring device, further comprising: a removing unit, a comparing unit that compares outputs of the first and second removing units for each color, and a display unit that displays a comparison result by the comparing unit. ..