JPH05316542A - Hue adjustment device - Google Patents

Abstract

PURPOSE:To provide a hue adjustment device not susceptible to the revision of the adjustment standards and an amplitude of a waveform. CONSTITUTION:A sample-and-hold measurement means 3 measures a hue waveform outputted from a body 1 to be adjusted and the measured value is converted into a phase angle at a specific point by an arithmetic operation processing means 6 via a D/A converter 4 and a sample-and-hold data storage means 5. Then an adjustment element control means 8 adjusts the body 1 to be adjusted in such a way that a phase angle at a specific point, that is, a hue is equal to the adjustment standard inputted by an adjustment standard input means 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hue adjusting device used in an adjusting process of a television receiver.

[0002]

2. Description of the Related Art A hue adjusting device inputs a composite image signal for hue adjustment to an object to be adjusted such as a television receiver so that the waveforms of the three primary color signals reproduced by the object to be adjusted coincide with the hue adjusting standard. To adjust to.

FIG. 2 shows an example of a hue adjusting composite video signal. (A) is a waveform diagram of the hue adjusting composite video signal, and (b) shows each burst phase in the hue adjusting composite video signal. It is a figure. Here, the luminance level is constant and the chrominance phase is in 30 ° steps. 3 is a diagram showing an example of the hue adjustment standard.

A conventional hue adjusting device of this type will be described below. When the hue adjustment standard is as shown in FIG. 3 (a), the sample points S ₂ and S ₄ are sample-held and measured, and the sample data A ₂ and A ₄ are set so that A ₂ = A ₄ Adjust the adjustment element.

When the hue adjustment standard is as shown in FIG. 3 (b),
The sample points S ₃ and S ₄ are sample-held and measured so that A ₃ = A ₄ from the respective sample data A ₃ and A ₄ .
Adjust the adjustment element of the object to be adjusted.

Further, when the hue adjustment standard is as shown in FIG. 3C, sample points S ₂ , S ₃ and S ₄ are sample-held and measured, and from each sample data A ₂ , A ₃ and A ₄ , A ₃ − A
The adjustment element of the object to be adjusted is adjusted so that ₄ = A ₄ −A ₂ .

As described above, even the conventional hue adjusting device can adjust the object to be adjusted to an arbitrary hue waveform.

[0008]

However, in the conventional hue adjusting device, it is necessary to change the sample point and the arithmetic processing based on the adjustment standard, and therefore it is not possible to easily cope with the change of the adjustment standard. There is also a problem that the adjustment error changes depending on the amplitude of the waveform.

The present invention solves such a conventional problem, and has an excellent hue which is not affected by the amplitude of the waveform without changing the sample point or the arithmetic processing in response to the change of the adjustment standard. The purpose is to provide an adjusting device.

[0010]

In order to achieve the above object, the present invention performs sample hold measurement at three points: a burst point, a chrominance phase point to be specified, and a 90 ° chrominance phase shift from the specified point. A calculation processing means for calculating the phase angle of the specific point is provided to adjust the adjusting element of the object to be adjusted so that the phase angle of the specific point is converted based on the hue adjustment standard.

[0011]

Therefore, according to the present invention, the change of the hue waveform with respect to the adjusting element is replaced by the change of the phase angle of the specific point,
The hue adjustment control parameter can be set to one, and the adjustment program can be simplified.

[0012]

1 is a diagram showing the configuration of an embodiment of the present invention. In FIG. 1, reference numeral 1 is an object to be adjusted, which is a television receiver here. Reference numeral 2 is a composite video signal generator, which may generate a signal as shown in FIG. However, when a tuner terminal is used for inputting an object to be adjusted which is a television receiver, RF modulation is performed. Reference numeral 3 is a sample and hold measuring means for measuring any of the three primary color signals output from the television receiver in synchronization with the composite video signal. Reference numeral 4 is a D / A converter for converting the measured value from the sample hold measuring means 3 into digital / analog (hereinafter referred to as D / A), and 5 is a sample data storage means for storing the D / A converted sample data. is there. 6 is an arithmetic processing means for calculating the phase angle of the specific point from the sample hold, 7 is an adjustment standard value input means for inputting the phase angle of the specific point calculated based on the adjustment standard, and 8 is a phase angle of the specific point. The adjusting element control means controls the adjusting element of the body to be adjusted 1 so that the adjusted standard value is obtained.

Next, the operation of the above embodiment will be described.
In the above embodiment, the composite video signal generator 2 inputs the phase adjustment signal to the object to be adjusted 1. The phase waveform output from the body to be adjusted 1 is measured by the sample hold measuring means 3. Sample point, as shown in FIG. 3, S _ref, setting three points S ₄ S _1, and from a certain point in that shift of 90 ° chrominance phase as the specific point in terms of chrominance phase 150 ° to burst point To be done. When the D / A converter 4 uses the sample-hold measured values of each of these three points as A _ref , A ₁ , and A ₄ , the phase angle θ of the specific point is the sample data storage means 5. Through
It is calculated by the arithmetic processing means 6 by the following equation.

Θ = tan ⁻¹ {(A ₁ −A _ref ) / (A ₄ −A _ref )} The phase angle of a specific point, that is, the hue adjustment standard value θ _x is input by the adjustment standard value input means 7 and adjusted. The element control means 8 controls the adjustment element of the television receiver so that θ = θ _x .

As described above, according to the above-described embodiment, when the sample and hold measuring means 3 performs fixed three-point sample and hold measurement, the phase angle θ of the specific point is calculated by the arithmetic processing means 6, and the phase of the specific point is calculated. This has an advantage that the hue can be adjusted by the adjusting element control unit 8 according to the difference from the adjustment standard of the angle.

In the above embodiment, the composite video signal generator 2 generates 10 patterns of chrominance phases in 30 ° steps as shown in FIG. 2, but two patterns of chrominance phases of 150 ° and 60 ° are used. May be In this case, there is an advantage that the sample-hold measurement becomes easy because the measurement point becomes wider.

[0017]

According to the present invention, as is apparent from the above-described embodiment, three points, that is, a burst point, a specified chrominance phase point and a point deviated by 90 ° chrominance phase from the specified point, are sample-held and measured. By calculating the phase angle and adjusting the adjustment element of the object to be adjusted so that it becomes the phase angle of the above-mentioned specific point converted based on the hue adjustment standard, the sample point / calculation for the change of the adjustment standard It has an effect that the processing is not changed and the amplitude of the waveform is not easily influenced.

Further, according to the present invention, since the change of the hue waveform with respect to the adjusting element is replaced with the change of the phase angle of the specific point, it is possible to set only one control parameter for the hue adjustment, and the automatic adjustment program. It also has the effect that it can be simplified.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a composite video signal for hue adjustment.

FIG. 3 is a diagram showing an example of a hue adjustment standard.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Object to be adjusted 2 Composite video signal generator 3 Sample and hold measuring means 4 D / A converter 5 Sample data storage means 6 Arithmetic processing means 7 Adjustment standard value input means 8 Adjustment element control means

Claims (1)

[Claims] 1. A signal generating means for generating a composite video signal for hue adjustment and supplying it to an object to be adjusted, and an output 3 from the object to be adjusted.
Sample-and-hold measuring means for sampling and holding the voltage at an arbitrary point of the primary color signal, sample-data storing means for storing the sample-and-hold data, arithmetic processing means for calculating the phase angle of a specific point from the stored sample data, and hue. Adjustment standard value input means for inputting the phase angle of the specific point converted based on the adjustment standard, and controlling the adjustment element of the object to be adjusted such that the phase angle calculated from the sample data of the specific point becomes the adjustment standard value. Adjusting device control means for adjusting the hue.