CN105141934B - Method and device for analog-to-digital signal compensation - Google Patents

Abstract

The invention discloses a method and device for analog-to-digital signal compensation. The method includes: after the terminal adjusts the white balance of the first signal source, obtaining the white balance parameter of the first signal source of the terminal; judging the white balance parameter of the white balance parameter Whether the green primary color gain value is less than the first threshold value corresponding to the first signal source; when the green primary color gain value is less than the first threshold value, increase the green primary color gain value to the first threshold value and the first red primary color gain value, and set the white balance The red primary color gain value and the blue primary color gain value of the parameter are multiplied by the first value to obtain the first red primary color gain value and the first blue primary color gain value, and the first value is the ratio of the first threshold value to the green primary color gain value; A green primary color gain value, a first red primary color gain value and a first blue primary color gain value are set as white balance parameters of the second signal source of the terminal. The present invention does not require a factory to perform a time-consuming and inefficient white balance adjustment process on all signal sources of the terminal, and also ensures that the terminal can pass the energy consumption test smoothly.

Description

Method and device for analog-to-digital signal compensation

technical field

The invention relates to the technical field of image display, in particular to a method and device for analog-to-digital signal compensation.

Background technique

White balance is produced along with the reproduction of true color of electronic images, and a series of problems of color reproduction and tone processing can be solved through white balance adjustment. Due to differences in hardware and software between the display screens of different terminals, especially TV terminals, if all TV terminals use the same white balance parameters, color casts will easily occur, which will affect the display quality of the terminals. Therefore, in the production process of TV terminals, the factory often needs to adjust the white balance parameters of each TV terminal to achieve better color reproduction and image quality improvement.

In the production process of the TV terminal, there are two ways to adjust the white balance parameters of the TV terminal: one is to adjust the white balance parameters of all signal sources of the TV terminal one by one, but this method is very time-consuming. Low efficiency; the other is to only adjust the digital signal (such as HDMI signal (High Definition Multimedia Interface, high-definition multimedia interface)) or only adjust the white balance parameters of the analog signal, and then all other sources use the same signal as the digital signal or analog signal. However, according to the brightness formula (for example, under the analog signal: Y1＝0.3R+0.6G+0.1B; under the digital signal: Y2＝0.21R+0.72G+0.07B, where Y1 is the Brightness, Y2 is the brightness under the digital signal, R is the gain value of the red primary color, G is the gain value of the green primary color, B is the gain value of the blue primary color), the same white balance parameters, the brightness of the obtained analog signal and digital signal are different The difference may cause the imaging of the analog signal or digital signal to be dark, causing the TV terminal to fail the energy consumption test.

Contents of the invention

The main purpose of the present invention is to provide a method and device for analog-to-digital signal compensation, aiming at solving the technical problems that adjusting the white balance parameters of a TV terminal takes a long time, is inefficient, and causes the TV terminal to fail to be tested.

In order to achieve the above object, the present invention provides a method of analog-to-digital signal compensation, the method of said analog-to-digital signal compensation includes:

After the terminal adjusts the white balance of the first signal source, obtain the white balance parameters of the first signal source of the terminal, wherein the white balance parameters include a green primary color gain value, a red primary color gain value, and a blue primary color gain value;

judging whether the green primary color gain value in the white balance parameter is smaller than a first threshold corresponding to the first signal source;

When the green primary color gain value is less than the first threshold value, increase the green primary color gain value to the first threshold value, and increase the red primary color gain value and the blue primary color gain value of the white balance parameter A first numerical multiple, where the first numerical multiple is the ratio of the first threshold to the green primary color gain value;

Set the white balance parameter of the second signal source of the terminal according to the increased green primary color gain value, red primary color gain value, and blue primary color gain value.

Preferably, the increased green primary color gain value is used as the first green primary color gain value, the increased red primary color gain value is used as the first red primary color gain value, and the increased blue primary color gain value is used as the first blue primary color gain value value, the step of setting the white balance parameters of the terminal second signal source according to the increased green primary color gain value, red primary color gain value and blue primary color gain value includes:

judging whether the gain value of the first primary red color is smaller than a second threshold corresponding to the first signal source;

When the gain value of the first primary red color is less than the second threshold, increase the gain value of the first primary red color to the second threshold, wherein the increased gain value of the first primary red color is used as the second threshold Gain value of two red primary colors;

increasing the gain value of the first primary blue color by a second numerical value, the second numerical value being the ratio of the second threshold value to the gain value of the first primary red color, wherein the increased gain of the first primary blue color Value as the second blue primary color gain value;

Setting a white balance parameter of a second signal source of the terminal according to the first green primary color gain value, the second red primary color gain value, and the second blue primary color gain value.

Preferably, the step of setting the white balance parameter of the second signal source of the terminal according to the first green primary color gain value, the second red primary color gain value and the second blue primary color gain value includes:

judging whether the second red primary color gain value is greater than the red gain extreme value corresponding to the first signal source;

When the second red primary color gain value is greater than the red gain extreme value corresponding to the first signal source, reduce the second red primary color gain value to the red gain extreme value to obtain a third red primary color gain value ;

Setting the first green primary color gain value, the third red primary color gain value, and the second blue primary color gain value as white balance parameters of the second signal source of the terminal.

Preferably, after the step of judging whether the second red primary color gain value is greater than the red gain extreme value corresponding to the first signal source, the step further includes:

When the second red primary color gain value is less than or equal to the red gain extreme value corresponding to the first signal source, the first green primary color gain value, the second red primary color gain value and the second blue The primary color gain value is set as a white balance parameter of the second signal source of the terminal.

Preferably, the method for analog-to-digital signal compensation also includes:

Detecting whether the image formed by the green primary color gain value, the red primary color gain value, and the blue primary color gain value set as the white balance parameter of the second signal source of the terminal has a color cast according to the chromaticity system;

If the image formed by the green primary color gain value, the red primary color gain value, and the blue primary color gain value set as the white balance parameter of the second signal source of the terminal has a color cast, then adjust the first threshold, the second threshold and/or or red gain extreme value, so as to adjust the green primary color gain value, the red primary color gain value and the blue primary color gain value set as the white balance parameter of the second signal source of the terminal.

In order to achieve the above object, the present invention also provides a device for analog-to-digital signal compensation, which includes:

A parameter acquisition module, configured to acquire the white balance parameters of the first signal source of the terminal after the terminal adjusts the white balance of the first signal source, wherein the white balance parameters include the green primary color gain value, the red primary color gain value and the blue primary color gain value;

A judging module, configured to judge whether the green primary color gain value in the white balance parameter is smaller than the first threshold corresponding to the first signal source;

an increasing module, configured to increase the green primary color gain value to the first threshold value when the green primary color gain value is less than the first threshold value, and increase the red primary color gain value and the red primary color gain value of the white balance parameter The blue primary color gain value is increased by a first numerical value, and the first numerical multiple is the ratio of the first threshold value to the green primary color gain value;

A parameter setting module, configured to set the white balance parameters of the second signal source of the terminal according to the increased green primary color gain value, red primary color gain value and blue primary color gain value.

Preferably, the increased green primary color gain value is used as the first green primary color gain value, the increased red primary color gain value is used as the first red primary color gain value, and the increased blue primary color gain value is used as the first blue primary color gain value value, the parameter setting module includes:

a gain value judging unit, configured to judge whether the first red primary color gain value is smaller than a second threshold corresponding to the first signal source;

A first gain increasing unit, configured to increase the first red primary color gain value to the second threshold value when the first red primary color gain value is smaller than the second threshold value, wherein the increased all The first red primary color gain value is used as the second red primary color gain value;

The second gain increasing unit is configured to increase the gain value of the first blue primary color by a second numerical value, and the second numerical value is the ratio of the second threshold value to the first red primary color gain value, wherein increasing The subsequent first blue primary color gain value is used as the second blue primary color gain value;

A parameter setting unit, configured to set a white balance parameter of the second signal source of the terminal according to the first green primary color gain value, the second red primary color gain value, and the second blue primary color gain value.

Preferably, the parameter setting unit includes:

A ratio judging unit, configured to judge whether the second red primary color gain value is greater than the red gain extreme value corresponding to the first signal source;

A first secondary setting unit, configured to reduce the second red primary color gain value to the red gain extreme value when the second red primary color gain value is greater than the red gain extreme value corresponding to the first signal source value to acquire a third primary color gain value of red, and set the gain value of the first primary color green, the gain value of the third primary color red, and the second primary color blue as the white balance of the second signal source of the terminal parameter.

Preferably, the parameter setting unit also includes:

The second secondary setting unit is configured to set the first green primary color gain value, the second red primary color gain value, and the second red primary color gain value to The primary color gain value and the second blue primary color gain value are set as white balance parameters of the second signal source of the terminal.

Preferably, the device for analog-to-digital signal compensation further includes:

The color cast detection module is used to detect whether the image formed by the green primary color gain value, the red primary color gain value and the blue primary color gain value set as the white balance parameter of the second signal source of the terminal has a color cast according to the chromaticity system; if The image formed by the green primary color gain value, the red primary color gain value, and the blue primary color gain value set as the white balance parameter of the second signal source of the terminal has a color cast, then adjust the first threshold, the second threshold and/or The red gain extreme value is used to adjust the green primary color gain value, the red primary color gain value and the blue primary color gain value set as the white balance parameter of the second signal source of the terminal.

In the present invention, after the terminal adjusts the white balance of the first signal source, the white balance parameter of the first signal source of the terminal is obtained, and then the green primary color gain value in the obtained white balance parameter is A threshold value is compared, if the green primary color gain value is less than the first threshold value, the green primary color gain value is increased to the first threshold value, and the red primary color gain value and the blue primary color gain value in the obtained white balance parameters are increased by the same value as The green primary color gain value is increased by the same multiple, so that when the white balance parameter of the first signal source is detected to be unreasonable, the white balance parameter is adjusted, and finally the adjusted white balance parameter is used as the white balance parameter of the second signal source. Balance parameters, so that on the premise of ensuring the brightness of the output image of the second signal source, the adjustment of the white balance parameters of the second signal source is automatically realized, without the need for the factory to perform time-consuming and inefficient white balance adjustments on the second signal source of the terminal The process also ensures that the brightness of the terminal display will not be too small and can pass the energy consumption test smoothly.

Description of drawings

1 is a schematic flow chart of the first embodiment of the method for analog-to-digital signal compensation of the present invention;

Fig. 2 is a schematic diagram of a refinement process for setting the white balance parameters of the second signal source of the terminal according to the increased green primary color gain value, red primary color gain value and blue primary color gain value in the method for analog-to-digital signal compensation of the present invention;

3 is a schematic diagram of the functional modules of the first embodiment of the device for analog-to-digital signal compensation of the present invention;

FIG. 4 is a schematic diagram of a detailed functional module of the device parameter setting module for analog-to-digital signal compensation in the present invention.

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

detailed description

It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The present invention provides a method for analog-digital signal compensation. In the first embodiment of the method for analog-digital signal compensation of the present invention, referring to FIG. 1, the method for analog-digital signal compensation includes:

Step S10, after the terminal adjusts the white balance of the first signal source, obtain the white balance parameters of the first signal source of the terminal, wherein the white balance parameters include the green primary color gain value, the red primary color gain value and the blue primary color gain value;

In this embodiment, the terminal is a smart TV, the first signal source is a digital signal source, and the second signal source is an analog signal source. After the technicians in the factory complete the white balance adjustment of the digital signal source of the TV terminal, obtain The white balance parameter of the digital signal source, the white balance parameter of the digital signal source includes the gain values of the three primary colors, that is, the white balance parameter includes the green primary color gain value, the red primary color gain value and the blue primary color gain value.

In addition, the terminal can also be other types of terminals. In other embodiments of the analog-to-digital signal compensation method of the present invention, the first signal source can be an analog signal source, and the second signal source can be a digital signal source. The analog signal source performs white balance adjustment, and then obtains the white balance parameter of the analog signal source, so as to obtain the corresponding white balance parameter of the digital signal source according to the white balance parameter of the analog signal. The execution process is basically the same as that of this embodiment.

Step S20, judging whether the green primary color gain value in the white balance parameter is smaller than the first threshold corresponding to the first signal source;

Based on the brightness formula (for example, under the analog signal: Y1＝0.3R+0.6G+0.1B; under the digital signal: Y2＝0.21R+0.72G+0.07B, where Y1 is the brightness under the analog signal, Y2 is the brightness under the digital signal luminance, R is the red primary color gain value, G is the green primary color gain value, B is the blue primary color gain value), the green primary color gain value contributes the most to the brightness of the digital signal, the red primary color gain value contributes second, and the blue primary color gain value contributes Therefore, it is first judged whether the green primary color gain value in the obtained white balance parameter (the white balance parameter of the first signal source (in this embodiment, the first signal source is a digital signal source)) is smaller than the first signal source corresponding to the first signal source. A threshold (the first threshold can be set by the user or automatically by the terminal), if the green primary color gain value of the first signal source is less than the first threshold, it indicates that the green primary color gain is too small, and the second signal source is based on the green primary color gain. The brightness of the primary color may be small, so it is necessary to increase the green primary color gain; if the green primary color gain of the first signal source is greater than or equal to the first threshold, it indicates that the green primary color gain is large enough, and the second signal source is based on the green primary color gain. The resulting brightness will not be too small, so there is no need to increase the gain of the green primary color.

In order to better understand this solution, the determination of the first threshold is explained. The first threshold in the present invention is obtained based on the brightness formula. The first threshold of the digital signal source is obtained based on the brightness formula under the digital signal. The analog signal source The first threshold value is obtained based on the luminance formula under the analog signal (the luminance formula is obtained based on the characteristics of the terminal display screen and various chip technical parameters and after many experiments or tests). For example, the luminance formula under the digital signal is Y3=0.2126R+ 0.7152G+0.0722B (Y3 is the brightness under the digital signal, R is the red primary color gain value, G is the green primary color gain value, B is the blue primary color gain value), the first threshold value corresponding to the brightness formula of the digital signal is 128, That is, when the green primary color gain value is greater than or equal to 128, the white balance parameters including the green primary color gain value can basically ensure that the brightness will not be too small.

Step S30, when the green primary color gain value is less than the first threshold value, increase the green primary color gain value to the first threshold value, and increase the red primary color gain value and the blue primary color gain value of the white balance parameter by a first numerical value, the first value One numerical value is the ratio of the first threshold value to the green primary color gain value;

Step S40, setting the white balance parameter of the second signal source of the terminal according to the increased green primary color gain value, red primary color gain value and blue primary color gain value.

When it is determined that the green primary color gain value in the white balance parameters of the first signal source is less than the first threshold corresponding to the first signal source, it indicates that the white balance parameters of the first signal source applied to the second signal source may cause the second signal source to display The brightness of the image is low, so the green primary color gain value in the white balance parameter of the first signal source is increased to the first threshold value, and the red primary color gain value and the blue primary color gain value of the white balance parameter are increased by the first value times , the first numerical value is the ratio of the first threshold to the green primary color gain value. For example, in the white balance parameters of the first signal source, the red primary color gain value R1=2, the green primary color gain value G1=4, the blue primary color gain value B1=1, and the first threshold corresponding to the first signal source is 8, then G1 is adjusted to 8. The first value is 2, R1 is adjusted to 4, and B1 is adjusted to 2, that is, the increased red primary color gain value R2=4, the increased green primary color gain value G2=8, and the increased blue primary color gain value The value B2=2, and then R2, G2, and B2 are used as the white balance parameters of the second signal source. When it is determined that the green primary color gain value in the white balance parameters of the first signal source is greater than or equal to the first threshold corresponding to the first signal source, it indicates that the application of the white balance parameters of the first signal source to the second signal source will not cause the second signal source to The brightness of the displayed image is relatively low, so the white balance parameter of the first signal source can be directly used as the white balance parameter of the second signal source.

In this embodiment, after the terminal adjusts the white balance of the first signal source, obtain the white balance parameters of the first signal source of the terminal, and then combine the green primary color gain value in the obtained white balance parameters with the first signal The first threshold corresponding to the source is compared, if the green primary color gain value is less than the first threshold value, the green primary color gain value is increased to the first threshold value, and the red primary color gain value and the blue primary color gain value in the obtained white balance parameters are The value is increased by the same multiple as the green primary color gain value, so that when the white balance parameter of the first signal source is detected to be unreasonable, the white balance parameter is adjusted, and finally the adjusted white balance parameter is used as the second The white balance parameters of the signal source, so that on the premise of ensuring the brightness of the output image of the second signal source, the adjustment of the white balance parameters of the second signal source is automatically realized, without the need for the factory to perform time-consuming and inefficient adjustments to the second signal source of the terminal The white balance adjustment process of the terminal also ensures that the terminal display brightness will not be too small and can pass the energy consumption test smoothly.

Further, on the basis of the first embodiment of the method for analog-to-digital signal compensation of the present invention, a second embodiment of the method for analog-to-digital signal compensation is proposed. Referring to FIG. 2 , in the second embodiment, the increased The green primary color gain value is used as the first green primary color gain value, the increased red primary color gain value is used as the first red primary color gain value, and the increased blue primary color gain value is used as the first blue primary color gain value. Step S40 includes:

Step S41, judging whether the gain value of the first primary red color is smaller than a second threshold corresponding to the first signal source;

Step S42, when the gain value of the first primary red color is less than the second threshold value, increase the gain value of the first primary red color to the second threshold value, wherein the increased gain value of the first primary red color is used as the second primary color gain value;

Step S43, increasing the gain value of the first primary blue color by a second numerical value, the second numerical value being the ratio of the second threshold value to the gain value of the first primary red color, wherein the increased gain value of the first primary blue color is used as the second blue base color gain value;

Step S44, setting the white balance parameter of the second signal source of the terminal according to the first green primary color gain value, the second red primary color gain value and the second blue primary color gain value.

When it is determined that the green primary color gain value in the white balance parameter of the first signal source is less than the first threshold value, the green primary color gain is increased to the first threshold value corresponding to the first signal source to obtain the first green primary color gain value, and increase in the same proportion Obtain the first red primary color gain value and the first blue primary color gain value after the corresponding red primary color gain value and the blue primary color gain value, then the first red primary color gain value and the second threshold corresponding to the first signal source (the second threshold value The determination process is basically the same as the first threshold), and when the first red gain value is less than the second threshold, the surface uses the first green primary color gain value, the first red primary color gain value and the first blue primary color gain value as the second signal The source may cause the brightness of the image displayed by the second signal source to be low, so increase the first red gain value to the second threshold to obtain the second red gain value, and at the same time increase the first blue gain value by the second value to obtain The second blue gain value, the second value is the ratio of the second threshold value to the first red primary color gain value, the first green primary color gain value, the second red primary color gain value and the second blue primary color gain value are set as the terminal first color gain value The white balance parameter of the second signal source. When the first red gain value is greater than or equal to the second threshold value, it indicates that applying the first green primary color gain value, the first red primary color gain value and the first blue primary color gain value to the second signal source will not cause the second signal source to display The brightness of the image is relatively low, so the first green primary color gain value, the first red primary color gain value, and the first blue primary color gain value can be directly used as the white balance parameters of the second signal source.

Following the example of step S40 above, the first red primary color gain value R2=4, the first green primary color gain value G2=8, the first blue primary color gain value B2=2, if the second threshold value is 6, adjust R2 to 6 , G2 remains unchanged, B2 is adjusted to 3, that is, the second red primary color gain value R3=6, the second blue primary color gain value B3=3, and R3, G2, and B3 are used as white balance parameters of the second signal source.

In this embodiment, by further judging whether the first red primary color gain value of the first signal source is smaller than the second threshold value, if the first red primary color gain value is smaller than the second threshold value, the first red primary color gain value is increased to the second threshold value. The second threshold value is used to obtain the second red primary color gain value, and at the same time, the first blue primary color gain value is increased by the second numerical value to obtain the second blue primary color gain value, and the first green primary color gain value, the first red primary color gain value and the first The blue primary color gain value is used as the white balance parameter of the second signal source, so that when the green primary color gain value is ensured to be large enough, the red primary color gain value is further ensured to be sufficiently large, which can assist the green primary color gain value to ensure the brightness of the terminal second signal source, Further ensure that the terminal passes the energy consumption test.

Further, on the basis of the second embodiment of the method for analog-to-digital signal compensation of the present invention, a third embodiment of the method for analog-to-digital signal compensation is proposed. In the third embodiment, step S44 includes:

Step S441, judging whether the second red primary color gain value is greater than the red gain extreme value corresponding to the first signal source;

Step S442, when the gain value of the second primary red color is greater than the extreme value of red gain corresponding to the first signal source, reduce the gain value of the second primary red color to the extreme value of red gain to obtain a third primary color gain value of red;

Step S443, setting the first green primary color gain value, the third red primary color gain value, and the second blue primary color gain value as white balance parameters of the second signal source of the terminal.

When the red primary color gain value of the first signal source is adjusted twice to obtain the second red primary color gain value, it is judged whether the second red primary color gain value is greater than the red gain extreme value corresponding to the first signal source, if the second red primary color If the gain value is greater than the extreme value of red gain, it means that the image displayed by the white balance parameters including the gain value of the second primary red color will be reddish. If the gain value of the second primary color red is reduced to the extreme value of red gain, the reduced second The red primary color gain value is used as the third red primary color gain value, the second blue primary color gain value remains unchanged, and then the first green primary color gain value, the third red primary color gain value, and the second blue primary color gain value are set as the terminal second signal source white balance parameters.

In this embodiment, after the first adjustment of the green primary color gain value, the secondary adjustment of the red primary color gain value and the blue primary color gain value, the second red primary color gain value obtained after the two adjustments is further adjusted To prevent the image displayed by the white balance parameters containing the second red primary color gain value from being too red, and to ensure that the image displayed by the white balance parameters acquired by the second signal source is moderately chromatic .

Further, on the basis of the third embodiment of the method for analog-to-digital signal compensation of the present invention, a fourth embodiment of the method for analog-to-digital signal compensation is proposed. In the fourth embodiment, after step S441, it also includes:

Step S444, when the second red primary color gain value is less than or equal to the red gain extreme value corresponding to the first signal source, set the first green primary color gain value, the second red primary color gain value and the second blue primary color gain value as the terminal first color gain value The white balance parameter of the second signal source.

When the red primary color gain value of the first signal source is adjusted twice to obtain the second red primary color gain value, it is judged whether the second red primary color gain value is greater than the red gain extreme value corresponding to the first signal source, if the second red primary color If the gain value is less than or equal to the red gain extreme value, it indicates that the image displayed by the white balance parameters including the second red primary color gain value is moderate in chromaticity, and there is no need to adjust the second red primary color gain value, and then the first green primary color gain value, The second red primary color gain value and the second blue primary color gain value are set as white balance parameters of the second signal source of the terminal.

In this embodiment, after the first adjustment of the green primary color gain value, the secondary adjustment of the red primary color gain value and the blue primary color gain value, the second red primary color gain value obtained after the two adjustments is further adjusted To prevent the image displayed by the white balance parameters containing the second red primary color gain value from being too red, and to ensure that the image displayed by the white balance parameters acquired by the second signal source is moderately chromatic .

Further, on the basis of the third or fourth embodiment of the analog-to-digital signal compensation method of the present invention, the analog-to-digital signal compensation method further includes:

Step S50, according to the chromaticity system, detect whether the image formed by the green primary color gain value, the red primary color gain value and the blue primary color gain value set as the white balance parameter of the terminal second signal source has a color cast;

In this embodiment, step S50 can be set after step S443 or step S444, the chromaticity system can adopt the 1931CIE-XYZ standard chromaticity system (that is, the CIE-XYZ chromaticity system), and the second signal source obtains the adjusted After the first signal source corresponds to the white balance parameter, the green primary color gain value, the red primary color gain value and the blue primary color gain value in the adjusted white balance parameter are obtained, and then the green primary color gain value (G) obtained by the second signal source, The red primary color gain value (R) and the blue primary color gain value (B) are converted from the value in the CIE-RGB chromaticity system to the value in the CIE-XYZ chromaticity system, and the obtained green primary color gain value (G), The red primary color gain value (R) and the blue primary color gain value (B) correspond to whether the values in the CIE-XYZ chromaticity system are up to standard, that is, based on the CIE-XYZ chromaticity system, it is judged that the green color that is set as the white balance parameter of the second signal source of the terminal Whether color cast occurs in the image formed by primary color gain value, red primary color gain value and blue primary color gain value.

Step S60, if the image formed by the green primary color gain value, the red primary color gain value and the blue primary color gain value set as the white balance parameter of the second signal source of the terminal has a color cast, adjust the first threshold, the second threshold and/or Red gain extreme value, to adjust the green primary color gain value, red primary color gain value and blue primary color gain value set as the white balance parameter of the second signal source of the terminal.

If the image formed by the green primary color gain value, red primary color gain value, and blue primary color gain value set as the white balance parameter of the second signal source of the terminal has a color cast, increase or decrease the first threshold, the second threshold, and the red One or more of the three values of the gain extreme value, and after increasing or decreasing one or more of the three values of the first threshold value, the second threshold value and the red gain extreme value, re-execute the analog-to-digital signal of the present invention The step in the first, second, third or fourth embodiment of the compensation method is to adjust the green primary color gain value, the red primary color gain value and the blue primary color gain value set as the white balance parameter of the second signal source of the terminal, And check again according to the chromaticity system (such as the CIE-XYZ chromaticity system) whether the image formed by the green primary color gain value, the red primary color gain value and the blue primary color gain value currently set as the white balance parameter of the terminal second signal source is biased. If there is no color cast, save the green primary color gain value, red primary color gain value, and blue primary color gain value currently set as the white balance parameters of the second signal source of the terminal; if there is color cast, continue to increase or decrease One or more of the three values of the first threshold, the second threshold, and the red gain extreme value, until the green primary color gain value, the red primary color gain value, and the blue primary color gain value of the white balance parameter of the current second signal source form The image does not suffer from color cast.

In addition, during the adjustment process of increasing or decreasing one or more of the three values of the first threshold, the second threshold and the red gain extremum, the order of the objects, the magnitude of the increase or decrease are increased or decreased The size can be set according to actual needs, for example, whether to first increase the first threshold or first increase the second threshold can be set according to actual needs.

In this embodiment, after preliminarily setting the green primary color gain value, red primary color gain value, and blue primary color gain value of the white balance parameter of the terminal second signal source, according to the chromaticity system detection, set the terminal second signal source Whether the image formed by the green primary color gain value, red primary color gain value, and blue primary color gain value of the white balance parameter has a color cast, if it is set as the green primary color gain value, red primary color gain value, and If there is color cast in the image formed by the blue primary color gain value, adjust the first threshold, the second threshold and/or the red gain extreme value to adjust the green primary color gain value, red primary color Gain value and blue primary color gain value to avoid displaying color cast images, using a combination of empirical values (such as the first threshold value, second threshold value or red gain extreme value) and actual chromaticity detection to avoid terminal hardware and software The difference does not adapt to the empirical value, so that the second signal source displays a color cast based on the obtained white balance parameters. It is also possible to adjust the empirical value according to the actual situation of the terminal hardware and software, so that the white balance parameter set as the second signal source The images formed by the green primary color gain value, the red primary color gain value and the blue primary color gain value have no color cast.

The present invention also provides a device for analog-to-digital signal compensation. In the first embodiment of the device for analog-to-digital signal compensation, referring to FIG. 3 , the device for analog-to-digital signal compensation includes:

The parameter acquiring module 10 is configured to acquire the white balance parameters of the first signal source of the terminal after the terminal adjusts the white balance of the first signal source, wherein the white balance parameters include the green primary color gain value, the red primary color gain value and the blue primary color gain value value;

In this embodiment, the terminal is a smart TV, the first signal source is a digital signal source, and the second signal source is an analog signal source. After the factory technicians complete the white balance adjustment of the digital signal source of the TV terminal, the parameter The obtaining module 10 obtains the white balance parameter of the digital signal source, and the white balance parameter of the digital signal source includes the gain values of the three primary colors, that is, the white balance parameter includes the green primary color gain value, the red primary color gain value and the blue primary color gain value.

In addition, the terminal can also be other types of terminals. In other embodiments of the analog-to-digital signal compensation method of the present invention, the first signal source can be an analog signal source, and the second signal source can be a digital signal source. The analog signal source performs white balance adjustment, and then the parameter acquisition module 10 obtains the white balance parameter of the analog signal source, so as to obtain the corresponding white balance parameter of the digital signal source according to the white balance parameter of the analog signal, and the execution process is basically the same as in this embodiment .

A judging module 20, configured to judge whether the green primary color gain value in the white balance parameter is smaller than the first threshold corresponding to the first signal source;

Based on the brightness formula (for example, under the analog signal: Y1＝0.3R+0.6G+0.1B; under the digital signal: Y2＝0.21R+0.72G+0.07B, where Y1 is the brightness under the analog signal, Y2 is the brightness under the digital signal luminance, R is the red primary color gain value, G is the green primary color gain value, B is the blue primary color gain value), the green primary color gain value contributes the most to the brightness of the digital signal, the red primary color gain value contributes second, and the blue primary color gain value contributes Therefore, the judging module 20 first judges whether the green primary color gain value in the acquired white balance parameter (the white balance parameter of the first signal source (in this embodiment, the first signal source is a digital signal source)) is smaller than that of the first signal source Corresponding to the first threshold (the first threshold can be set by the user or automatically by the terminal), if the green primary color gain value of the first signal source is less than the first threshold, it indicates that the green primary color gain is too small, and the second signal source is based on the green primary color The brightness obtained by the gain may be relatively small, so the increase module 30 needs to increase the green primary color gain; if the green primary color gain of the first signal source is greater than or equal to the first threshold, it indicates that the green primary color gain is large enough, and the second The brightness obtained by the signal source based on the green primary color gain will not be too small, so there is no need to increase the green primary color gain.

In order to better understand this solution, the determination of the first threshold is explained. The first threshold in the present invention is obtained based on the brightness formula. The first threshold of the digital signal source is obtained based on the brightness formula under the digital signal. The analog signal source The first threshold value is obtained based on the luminance formula under the analog signal (the luminance formula is obtained based on the characteristics of the terminal display screen and various chip technical parameters and after many experiments or tests). For example, the luminance formula under the digital signal is Y3=0.2126R+ 0.7152G+0.0722B (Y3 is the brightness under the digital signal, R is the red primary color gain value, G is the green primary color gain value, B is the blue primary color gain value), the first threshold value corresponding to the brightness formula of the digital signal is 128, That is, when the green primary color gain value is greater than or equal to 128, the white balance parameters including the green primary color gain value can basically ensure that the brightness will not be too small.

An increasing module 30, configured to increase the green primary color gain value to the first threshold value when the green primary color gain value is less than the first threshold value, and increase the red primary color gain value and the blue primary color gain value of the white balance parameter by a first value times, the first numerical times is the ratio of the first threshold to the green primary color gain value;

The parameter setting module 40 is configured to set the white balance parameter of the second signal source of the terminal according to the increased green primary color gain value, red primary color gain value and blue primary color gain value.

When the judging module 20 determines that the green primary color gain value in the white balance parameter of the first signal source is less than the first threshold corresponding to the first signal source, it indicates that the application of the white balance parameter of the first signal source to the second signal source may cause the second The brightness of the image displayed by the signal source is low, so the increase module 30 increases the green primary color gain value in the white balance parameter of the first signal source to the first threshold value, and simultaneously increases the red primary color gain value and the blue primary color gain value of the white balance parameter The value is increased by a first numerical multiple, and the first numerical multiple is the ratio of the first threshold to the green primary color gain value. For example, in the white balance parameters of the first signal source, the red primary color gain value R1=2, the green primary color gain value G1=4, the blue primary color gain value B1=1, and the first threshold corresponding to the first signal source is 8, then G1 is adjusted to 8. The first numerical value is multiplied by 2, R1 is adjusted to 4, and B1 is adjusted to 2, that is, the increased red primary color gain value R2=4, the increased green primary color gain value G2=8, and the increased blue primary color gain value The gain value B2=2, and then R2, G2, and B2 are used as white balance parameters of the second signal source. When the judgment module 20 determines that the green primary color gain value in the white balance parameter of the first signal source is greater than or equal to the first threshold corresponding to the first signal source, it indicates that the application of the white balance parameter of the first signal source to the second signal source will not cause The brightness of the image displayed by the second signal source is relatively low, so the parameter setting module 40 can directly use the white balance parameter of the first signal source as the white balance parameter of the second signal source.

In this embodiment, after the terminal adjusts the white balance of the first signal source, the parameter acquisition module 10 acquires the white balance parameters of the first signal source of the terminal, and then the green primary color in the white balance parameters acquired by the judgment module 20 The gain value is compared with the first threshold value corresponding to the first signal source, and if the green primary color gain value is smaller than the first threshold value, the increasing module 30 increases the green primary color gain value to the first threshold value, and the obtained white In the balance parameter, the red primary color gain value and the blue primary color gain value are increased by the same multiple as the green primary color gain value, so that when the white balance parameter of the first signal source is detected to be unreasonable, the white balance parameter is adjusted. Finally, the parameter setting module 40 uses the adjusted white balance parameter as the white balance parameter of the second signal source, thereby automatically realizing the adjustment of the white balance parameter of the second signal source under the premise of ensuring the output image brightness of the second signal source, There is no need for the factory to perform a time-consuming and inefficient white balance adjustment process on the second signal source of the terminal, and it also ensures that the brightness of the terminal display will not be too small and can pass the energy consumption test smoothly.

Further, on the basis of the first embodiment of the device for analog-to-digital signal compensation of the present invention, a second embodiment of the device for analog-to-digital signal compensation is proposed. Referring to FIG. 4 , in the second embodiment, the parameter setting module 40 includes :

A gain value judging unit 41, configured to judge whether the first red primary color gain value is smaller than a second threshold corresponding to the first signal source;

The first gain increasing unit 42 is configured to increase the first red primary color gain value to the second threshold value when the first red primary color gain value is less than the second threshold value, wherein the increased first red primary color gain value is used as the first red primary color gain value Gain value of two red primary colors;

The second gain increasing unit 43 is used to increase the gain value of the first blue primary color by a second numerical value, and the second numerical value is the ratio of the second threshold value to the first red primary color gain value, wherein the increased first blue The primary color gain value is used as the second blue primary color gain value;

The parameter setting unit 44 is configured to set the white balance parameter of the second signal source of the terminal according to the first green primary color gain value, the second red primary color gain value and the second blue primary color gain value.

When it is determined that the green primary color gain value in the white balance parameter of the first signal source is less than the first threshold value, the green primary color gain is increased to the first threshold value corresponding to the first signal source to obtain the first green primary color gain value, and increase in the same proportion After the corresponding red primary color gain value and blue primary color gain value, the first red primary color gain value and the first blue primary color gain value are obtained, and then the gain value judging unit 41 compares the first red primary color gain value with the second threshold value corresponding to the first signal source (the determination process of the second threshold is basically the same as the first threshold) for comparison, when the first red gain value is less than the second threshold, it indicates that the first green primary color gain value, the first red primary color gain value and the first blue primary color gain value value as the second signal source may cause the brightness of the image displayed by the second signal source to be low, so the first gain increasing unit 42 increases the first red gain value to the second threshold to obtain the second red gain value, while the second The gain increasing unit 43 increases the first blue gain value by a second numerical value to obtain a second blue gain value, and the second numerical value is the ratio of the second threshold value to the first red primary color gain value, and the parameter setting unit 44 sets the first blue gain value to A green primary color gain value, a second red primary color gain value and a second blue primary color gain value are set as white balance parameters of the second signal source of the terminal. When the first red gain value is greater than or equal to the second threshold value, it indicates that applying the first green primary color gain value, the first red primary color gain value and the first blue primary color gain value to the second signal source will not cause the second signal source to display The brightness of the image is relatively low, so the parameter setting unit 44 can directly use the first green primary color gain value, the first red primary color gain value, and the first blue primary color gain value as white balance parameters of the second signal source.

Following the example of the above parameter setting module 40, the first red primary color gain value R2=4, the first green primary color gain value G2=8, the first blue primary color gain value B2=2, if the second threshold value is 6, then adjust R2 To 6, G2 remains unchanged, B2 is adjusted to 3, that is, the second red primary color gain value R3=6, the second blue primary color gain value B3=3, and R3, G2, and B3 are used as white balance parameters of the second signal source.

In this embodiment, the gain value judging unit 41 further judges whether the first red primary color gain value of the first signal source is smaller than the second threshold value, and if the first red primary color gain value is smaller than the second threshold value, the first gain increasing unit 42 increasing the gain value of the first primary red color to the second threshold to obtain a second primary color gain value of red, and at the same time, the second gain increasing unit 43 increases the gain value of the first primary color blue by a second numerical value to obtain a second primary color gain value of blue , and the parameter setting unit 44 uses the first green primary color gain value, the first red primary color gain value and the first blue primary color gain value as the white balance parameters of the second signal source, so as to further ensure that the green primary color gain value is large enough The red primary color gain value is large enough to assist the green primary color gain value to ensure the brightness of the second signal source of the terminal, and further ensure that the terminal passes the energy consumption test.

Further, on the basis of the second embodiment of the device for analog-to-digital signal compensation of the present invention, a third embodiment of the device for analog-to-digital signal compensation is proposed. In the third embodiment,

Parameter setting unit 44 comprises:

A ratio judging unit 441, configured to judge whether the second red primary color gain value is greater than the red gain extreme value corresponding to the first signal source;

The first secondary setting unit 442 is used to reduce the gain value of the second primary red color to the extreme red gain value to obtain the third primary red color when the gain value of the second primary red color is greater than the extreme red gain value corresponding to the first signal source gain value, and set the first green primary color gain value, the third red primary color gain value, and the second blue primary color gain value as white balance parameters of the second signal source of the terminal.

When the red primary color gain value of the first signal source is adjusted twice to obtain the second red primary color gain value, the ratio judging unit 441 judges whether the second red primary color gain value is greater than the corresponding red gain extreme value of the first signal source, if The second red primary color gain value is greater than the red gain extreme value, indicating that the image displayed by the white balance parameter including the second red primary color gain value will be reddish, and the first secondary setting unit 442 reduces the second red primary color gain value to red Gain extreme value and take the reduced second red primary color gain value as the third red primary color gain value, the second blue primary color gain value remains unchanged, and then use the first green primary color gain value, the third red primary color gain value and the second primary color gain value The blue primary color gain value is set as the white balance parameter of the second signal source of the terminal.

In this embodiment, after the first adjustment of the green primary color gain value and the secondary adjustment of the red primary color gain value and the blue primary color gain value, the ratio judging unit 441 further adjusts the second red primary color gain obtained after two adjustments Compared with the red gain extreme value, the image displayed by the white balance parameters including the second red primary color gain value will be reddish to prevent the second red primary color gain value from being too large, so as to ensure that the white balance parameters obtained by the second signal source are displayed. The color of the image is moderate.

Further, on the basis of the third embodiment of the device for analog-to-digital signal compensation of the present invention, a fourth embodiment of the device for analog-to-digital signal compensation is proposed. In the fourth embodiment, the parameter setting unit 44 further includes:

The second secondary setting unit 443 is configured to set the first green primary color gain value, the second red primary color gain value and the second blue The primary color gain value is set as the white balance parameter of the second signal source of the terminal.

When the red primary color gain value of the first signal source is adjusted twice to obtain the second red primary color gain value, the ratio judging unit 441 judges whether the second red primary color gain value is greater than the corresponding red gain extreme value of the first signal source, if The gain value of the second primary red color is less than or equal to the extreme value of the red primary color, indicating that the image chromaticity displayed by the white balance parameters including the gain value of the second primary red color is moderate, and there is no need to adjust the gain value of the second primary red color, and then the second secondary The setting unit 443 sets the first green primary color gain value, the second red primary color gain value, and the second blue primary color gain value as white balance parameters of the second signal source of the terminal.

In this embodiment, after the first adjustment of the green primary color gain value and the secondary adjustment of the red primary color gain value and the blue primary color gain value, the ratio judging unit 441 further adjusts the second red primary color gain obtained after two adjustments Compared with the red gain extreme value, the image displayed by the white balance parameters including the second red primary color gain value will be reddish to prevent the second red primary color gain value from being too large, so as to ensure that the white balance parameters obtained by the second signal source are displayed. The color of the image is moderate.

Further, on the basis of the third or fourth embodiment of the device for analog-to-digital signal compensation of the present invention, the device for analog-to-digital signal compensation further includes:

The color cast detection module 50 is used to detect whether color cast occurs in the image formed by the green primary color gain value, the red primary color gain value and the blue primary color gain value set as the white balance parameter of the terminal second signal source according to the chromaticity system; if set If the image formed by the green primary color gain value, the red primary color gain value, and the blue primary color gain value of the white balance parameter of the second signal source of the terminal has a color cast, then adjust the first threshold, the second threshold and/or the extreme value of the red gain, To adjust the green primary color gain value, red primary color gain value and blue primary color gain value set as the white balance parameter of the terminal's second signal source.

In this embodiment, the chromaticity system can adopt the 1931CIE-XYZ standard chromaticity system (that is, the CIE-XYZ chromaticity system). After the second signal source obtains the adjusted white balance parameters of the first signal source, the parameter acquisition The module 10 acquires the green primary color gain value, the red primary color gain value, and the blue primary color gain value in the adjusted white balance parameters, and then the color cast detection module 50 obtains the green primary color gain value (G), red primary color gain value (G), and the red primary color gain value obtained by the second signal source. The value (R) and the blue primary color gain value (B) are converted from the value in the CIE-RGB chromaticity system to the value in the CIE-XYZ chromaticity system, and the color cast detection module 50 judges the green primary color gain value (G ), the red primary color gain value (R) and the blue primary color gain value (B) correspond to whether the values in the CIE-XYZ chromaticity system are up to standard, that is, based on the CIE-XYZ chromaticity system, it is judged that the white balance parameter set as the second signal source of the terminal Whether the image formed by the green primary color gain value, the red primary color gain value and the blue primary color gain value has a color cast.

If the image formed by the green primary color gain value, the red primary color gain value, and the blue primary color gain value set as the white balance parameter of the second signal source of the terminal has a color cast, the color cast detection module 50 increases or decreases the first threshold, One or more of the three values of the second threshold and the red gain extremum, and after increasing or decreasing one or more of the three values of the first threshold, the second threshold and the red gain extremum, re-execute The steps in the first, second, third or fourth embodiment of the method for analog-to-digital signal compensation of the present invention are to adjust the green primary color gain value, the red primary color gain value and the white balance parameter set as the terminal second signal source. The gain value of the blue primary color, and again according to the chromaticity system (such as the CIE-XYZ chromaticity system), detects the green primary color gain value, the red primary color gain value and the blue primary color gain value that are currently set as the white balance parameters of the second signal source of the terminal. Whether color cast occurs in the image; if there is no color cast, save the green primary color gain value, red primary color gain value and blue primary color gain value currently set as the white balance parameter of the second signal source of the terminal; if there is color cast, then Continue to increase or decrease one or more of the three values of the first threshold, the second threshold and the red gain extreme value until the green primary color gain value, red primary color gain value and blue primary color gain value of the current white balance parameter of the second signal source. The image formed by the primary color gain value does not have a color cast.

In addition, during the adjustment process of increasing or decreasing one or more of the three values of the first threshold, the second threshold and the red gain extremum, the order of the objects, the magnitude of the increase or decrease are increased or decreased The size can be set according to actual needs, for example, whether to first increase the first threshold or first increase the second threshold can be set according to actual needs.

In this embodiment, after preliminarily setting the green primary color gain value, red primary color gain value, and blue primary color gain value of the white balance parameter of the second signal source of the terminal, the color cast detection module 50 is set as the terminal according to the chromaticity system detection. Whether the image formed by the green primary color gain value, red primary color gain value, and blue primary color gain value of the white balance parameter of the second signal source has a color cast, if it is set as the green primary color gain value of the white balance parameter of the second signal source of the terminal, If the image formed by the red primary color gain value and the blue primary color gain value has a color cast, then adjust the first threshold, the second threshold and/or the red gain extreme value to adjust the green primary color set as the white balance parameter of the second signal source of the terminal gain value, red primary color gain value, and blue primary color gain value to avoid displaying color cast images, and adopt a scheme that combines empirical values (such as the first threshold value, second threshold value, or red gain extreme value) with actual chromaticity detection to avoid The difference between the terminal hardware and software does not adapt to the empirical value, causing the second signal source to display a color cast based on the obtained white balance parameters. It is also possible to adjust the empirical value according to the actual situation of the terminal hardware and software, so that it is set as the second signal source. The image formed by the green primary color gain value, the red primary color gain value and the blue primary color gain value of the white balance parameter does not have color cast.

Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation. Based on such an understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of software products, and the computer software products are stored in a storage medium (such as ROM/RAM, disk, CD) contains several instructions to make a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) execute the methods of various embodiments of the present invention.

The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technical fields , are all included in the scope of patent protection of the present invention in the same way.

Claims (10)

1. A method for analog-to-digital signal compensation, characterized in that, the method for said analog-to-digital signal compensation comprises: After the terminal adjusts the white balance of the first signal source, obtain the white balance parameters of the first signal source of the terminal, wherein the white balance parameters include a green primary color gain value, a red primary color gain value, and a blue primary color gain value; judging whether the green primary color gain value in the white balance parameter is smaller than a first threshold corresponding to the first signal source; When the green primary color gain value is less than the first threshold value, increase the green primary color gain value to the first threshold value, and increase the red primary color gain value and the blue primary color gain value of the white balance parameter A first numerical multiple, where the first numerical multiple is the ratio of the first threshold to the green primary color gain value; Set the white balance parameter of the second signal source of the terminal according to the increased green primary color gain value, red primary color gain value, and blue primary color gain value. 2. The method for analog-to-digital signal compensation as claimed in claim 1, wherein the increased green primary color gain value is used as the first green primary color gain value, and the increased red primary color gain value is used as the first red primary color gain value. The gain value and the increased blue primary color gain value are used as the first blue primary color gain value, The step of setting the white balance parameter of the second signal source of the terminal according to the increased green primary color gain value, red primary color gain value and blue primary color gain value includes: judging whether the gain value of the first primary red color is smaller than a second threshold corresponding to the first signal source; When the gain value of the first primary red color is less than the second threshold, increase the gain value of the first primary red color to the second threshold, wherein the increased gain value of the first primary red color is used as the second threshold Gain value of two red primary colors; increasing the gain value of the first primary blue color by a second numerical value, the second numerical value being the ratio of the second threshold value to the gain value of the first primary red color, wherein the increased gain of the first primary blue color Value as the second blue primary color gain value; Setting a white balance parameter of a second signal source of the terminal according to the first green primary color gain value, the second red primary color gain value, and the second blue primary color gain value. 3. The method for analog-to-digital signal compensation as claimed in claim 2, characterized in that, according to the first green primary color gain value, the second red primary color gain value and the second blue primary color gain value setting The steps of the white balance parameter of the second signal source of the terminal include: judging whether the second red primary color gain value is greater than the red gain extreme value corresponding to the first signal source; When the second red primary color gain value is greater than the red gain extreme value corresponding to the first signal source, reduce the second red primary color gain value to the red gain extreme value to obtain a third red primary color gain value ; Setting the first green primary color gain value, the third red primary color gain value, and the second blue primary color gain value as white balance parameters of the second signal source of the terminal. 4. The method for analog-to-digital signal compensation according to claim 3, characterized in that, after the step of judging whether the gain value of the second primary red color is greater than the extreme value of the red gain corresponding to the first signal source, it further comprises : When the second red primary color gain value is less than or equal to the red gain extreme value corresponding to the first signal source, the first green primary color gain value, the second red primary color gain value and the second blue The primary color gain value is set as a white balance parameter of the second signal source of the terminal. 5. the method for analog-to-digital signal compensation as described in any one of claims 3 to 4, is characterized in that, the method for described analog-digital signal compensation also comprises: Detecting whether the image formed by the green primary color gain value, the red primary color gain value, and the blue primary color gain value set as the white balance parameter of the second signal source of the terminal has a color cast according to the chromaticity system; If the image formed by the green primary color gain value, the red primary color gain value, and the blue primary color gain value set as the white balance parameter of the second signal source of the terminal has a color cast, then adjust the first threshold, the second threshold and/or or red gain extreme value, so as to adjust the green primary color gain value, the red primary color gain value and the blue primary color gain value set as the white balance parameter of the second signal source of the terminal. 6. A device for analog-digital signal compensation, characterized in that the device for analog-digital signal compensation comprises: A parameter acquisition module, configured to acquire the white balance parameters of the first signal source of the terminal after the terminal adjusts the white balance of the first signal source, wherein the white balance parameters include the green primary color gain value, the red primary color gain value and the blue primary color gain value; A judging module, configured to judge whether the green primary color gain value in the white balance parameter is smaller than the first threshold corresponding to the first signal source; an increasing module, configured to increase the green primary color gain value to the first threshold value when the green primary color gain value is less than the first threshold value, and increase the red primary color gain value and the red primary color gain value of the white balance parameter The blue primary color gain value is increased by a first numerical value, and the first numerical multiple is the ratio of the first threshold value to the green primary color gain value; A parameter setting module, configured to set the white balance parameters of the second signal source of the terminal according to the increased green primary color gain value, red primary color gain value and blue primary color gain value. 7. The device for analog-to-digital signal compensation as claimed in claim 6, wherein the increased green primary color gain value is used as the first green primary color gain value, and the increased red primary color gain value is used as the first red primary color gain value. The gain value and the increased blue primary color gain value are used as the first blue primary color gain value, The parameter setting module includes: a gain value judging unit, configured to judge whether the first red primary color gain value is smaller than a second threshold corresponding to the first signal source; A first gain increasing unit, configured to increase the first red primary color gain value to the second threshold value when the first red primary color gain value is smaller than the second threshold value, wherein the increased all The first red primary color gain value is used as the second red primary color gain value; The second gain increasing unit is configured to increase the gain value of the first blue primary color by a second numerical value, and the second numerical value is the ratio of the second threshold value to the first red primary color gain value, wherein increasing The subsequent first blue primary color gain value is used as the second blue primary color gain value; A parameter setting unit, configured to set a white balance parameter of the second signal source of the terminal according to the first green primary color gain value, the second red primary color gain value, and the second blue primary color gain value. 8. The device of analog-digital signal compensation as claimed in claim 7, is characterized in that, described parameter setting unit comprises: A ratio judging unit, configured to judge whether the second red primary color gain value is greater than the red gain extreme value corresponding to the first signal source; A first secondary setting unit, configured to reduce the second red primary color gain value to the red gain extreme value when the second red primary color gain value is greater than the red gain extreme value corresponding to the first signal source value to acquire a third primary color gain value of red, and set the gain value of the first primary color green, the gain value of the third primary color red, and the second primary color blue as the white balance of the second signal source of the terminal parameter. 9. The device of analog-digital signal compensation as claimed in claim 8, is characterized in that, described parameter setting unit also comprises: The second secondary setting unit is configured to set the first green primary color gain value, the second red primary color gain value, and the second red primary color gain value to The primary color gain value and the second blue primary color gain value are set as white balance parameters of the second signal source of the terminal. 10. The device for analog-to-digital signal compensation as claimed in any one of claims 8 to 9, wherein the device for said analog-digital signal compensation further comprises: The color cast detection module is used to detect whether the image formed by the green primary color gain value, the red primary color gain value and the blue primary color gain value set as the white balance parameter of the second signal source of the terminal has a color cast according to the chromaticity system; if The image formed by the green primary color gain value, the red primary color gain value, and the blue primary color gain value set as the white balance parameter of the second signal source of the terminal has a color cast, then adjust the first threshold, the second threshold and/or The red gain extreme value is used to adjust the green primary color gain value, the red primary color gain value and the blue primary color gain value set as the white balance parameter of the second signal source of the terminal.