CN101080027A - Method for Improving the Difference of LCD Image Quality in Different Viewing Modes - Google Patents

Abstract

A method for improving the disparity of Liquid Crystal Display (LCD) image quality in different viewing modes (view modules), comprising: firstly, converting image data from a spatial domain with luminance (luminance) and chrominance (chrominance) signals into a spatial domain with three-color signals; then, in the space domain with three-color signals, respectively adjusting the brightness parameter value, the color parameter value and/or the contrast parameter value of the liquid crystal display according to the brightness expression, the color expression and/or the contrast expression required by the image data; then, converting the image data from the space domain with three-color signals into a space domain with brightness and chrominance signals; finally, in the image playing mode, the image data is displayed on the adjusted liquid crystal display.

Description

Method for Improving the Difference of LCD Image Quality in Different Viewing Modes

technical field

The present invention relates to a kind of method that is used to improve the difference of image quality of liquid crystal display (LCD) under different viewing modes (view module), especially a kind of method that is used to improve the image quality of liquid crystal display by real-time preview mode (LiveView module) and playing mode (playback module) caused by the difference method.

Background technique

There are many ways for people to commemorate the good times, and among them, photos are the most frequently used ones, because whether it is travel, parties, or even all memorable moments, they can be recorded by the camera for future use. remember. In addition, based on the convenience of using digital cameras to transfer captured image data to electronic devices (such as computers) for modification and processing, and their prices are gradually decreasing, more and more people use digital cameras.

Generally speaking, due to the relationship of lens shading, the image quality of the digital camera in real-time preview (LiveView) has a serious problem of shading on the liquid crystal display. Therefore, the generally known solution is: use a group of preview gamma values (previewgamma) to reduce the impact of vignetting, but because the image capture gamma value (capture gamma) is usually used when taking pictures, the same problem occurs. An LCD monitor uses two sets of different gamma values, resulting in differences in the brightness and color of images seen on the LCD monitor during real-time preview and image playback.

Therefore, it can be seen from the above that the above-mentioned known digital cameras have the problem of brightness and color differences due to different gamma values. In actual use, it is obviously inconvenient and shortcoming, and needs to be improved.

Contents of the invention

The invention relates to a method for improving the difference in image quality of a liquid crystal display under different viewing modes. The present invention converts and corrects the YUV domain and the RGB domain to improve the known differences in color and brightness of liquid crystal display images caused by the difference between the preview gamma value and the image capture gamma value. This method is useful when the lens is dark When the angle seriously affects the image lens, it has an excellent correction effect. Thereby, the present invention can make the brightness and color of the photos seen in the real-time preview and video playback after the camera takes pictures as consistent as possible.

In order to solve the above-mentioned technical problems, according to one of the solutions of the present invention, a method for improving the difference in image quality of a liquid crystal display under different viewing modes is provided, the steps of which include: first, converting an image data (image data), Convert from a spatial domain with luminance and chrominance signals to a spatial domain with three-color signals; then, in the spatial domain with three-color signals, according to the image data required brightness performance, color performance and/or contrast ratio performance, so as to adjust the brightness parameter value, color parameter value and/or contrast ratio parameter value of the liquid crystal display respectively; then, convert the image data from the space domain with the three-color signal is a spatial domain with luminance and chrominance signals; finally, in the playing image mode, displaying the image data on the adjusted liquid crystal display.

The method for improving the difference in image quality of a liquid crystal display under different viewing modes, the liquid crystal display is a liquid crystal display whose brightness, color and contrast cannot be adjusted.

In the method for improving the difference in image quality of a liquid crystal display under different viewing modes, the spatial domain with luminance and chrominance signals is a YUV domain.

In the method for improving the image quality difference caused by different viewing modes of a liquid crystal display, the spatial domain with three-color signals is the RGB domain.

In the method for improving the difference in image quality of a liquid crystal display under different viewing modes, the value of the brightness parameter is the green gain value among the digital gain values.

In the method for improving the difference in image quality of a liquid crystal display under different viewing modes, the color parameter values are red and blue gain values in digital gain values.

In the method for improving the difference in image quality of a liquid crystal display under different viewing modes, the value of the contrast parameter is a gamma curve.

Description of drawings

FIG. 1 is a flowchart of a method for improving the image quality of a liquid crystal display caused by differences in different viewing modes according to the present invention.

Detailed ways

As shown in FIG. 1, the present invention provides a method for improving the difference in image quality of a liquid crystal display caused by different viewing modes, wherein the liquid crystal display is a liquid crystal display whose brightness, color and contrast cannot be adjusted by hardware devices .

The steps of the present invention include: firstly, converting an image data from a spatial domain with luminance and chrominance signals to a spatial domain with three-color signals (step S100), wherein the image data is stored in memory, and the The spatial domain with luminance and chrominance signals can be YUV domain (YUV domain), or called YC _b C _r domain (YC _b C _r domain), and the spatial domain with three-color signals can be RGB domain (RGB domain) . In addition, the color space conversion formula for converting the YC _b C _r domain (YC _b C _r domain) to the RGB domain is as follows:

R＝1.164(Y)+1.596(C _r -128)

G=1.164(Y)-0.813(C _r -128)-0.392(C _b -128)

B=1.164(Y)+2.017(C _b -128)

Then, in the spatial domain with the three-color signals, adjust the brightness parameter value, color parameter value and/or contrast ratio parameter of the liquid crystal display according to the required brightness performance, color performance and/or contrast performance of the image data value (step S102), wherein the brightness parameter value is the green gain value (G gain) in the digital gain value (digital gain), and the color parameter value is the red and blue gain value (R gain and B gain), and the contrast parameter value is the gamma curve.

Then, convert the image data from the spatial domain with three-color signals to the spatial domain with luminance and chrominance signals (step S104); finally, in the image playback mode, display the adjusted liquid crystal display on the Image data (step S106). Wherein, if the step S104 takes the conversion of the RGB domain to the YC _b C _r domain as an example, its color space conversion formula is as follows:

Y＝0.257R+0.504G+0.098B

C _b =-0.148R-0.291G+0.439B

_Cr ＝0.439R-0.368G-0.071B

To sum up, the color space of a photo usually seen in the playback mode is YUV (or YC _b C _r ), so if you want to correct the color performance of a photo, you must first convert it to RGB color space, and then Adjust the digital gain value (R gain, G gain, B gain) or adjust the gamma curve (or Gamma Table) according to the desired color performance, and finally convert it back to YUV through a digital signal processor (Digital Signal Process, DSP) (or YC _b C _r ) format, so in playback mode, the color and brightness of the photos seen on the LCD monitor will be consistent with those seen on the real-time preview.

Therefore, the present invention can improve the known differences in color and brightness of liquid crystal display images caused by the difference between the preview gamma value and the image capture gamma value through the conversion and correction of the YUV domain and the RGB domain. When the vignetting of the lens seriously affects the lens of the image, it has an excellent correction effect. Therefore, the present invention can make the brightness and color of the photos seen in the real-time preview and video playback after the camera takes pictures as consistent as possible.

The above is only a detailed description and accompanying drawings of one of the best specific embodiments of the present invention, and the features of the present invention are not limited thereto, nor can this limit the scope of patent protection of the present invention, and the present invention All the scope of the application shall be subject to the protection scope of the patent application, that is, all simple equivalent changes and modifications made according to the scope of the application for patent protection of the present invention and the contents of the description of the invention shall fall within the scope covered by the patent of the present invention.

Claims (7)

1. a method that is used to improve the difference of LCD image quality under different watching mode is characterized in that, comprises the following steps:

With an image data, be changed to one from a transform of spatial domain with brightness and carrier chrominance signal and have the spatial domain of tristimulus signal;

Have in the spatial domain of tristimulus signal at this,, adjust luminance parameter value, color parameter value and/or the contrast level parameter value of this LCD respectively according to the required brightness performance of this image data, color performance and/or contrast performance;

This image data is changed to the spatial domain with brightness and carrier chrominance signal from this transform of spatial domain with tristimulus signal; And

In this playing video pattern, on this adjusted LCD, show this image data.

2. the method that is used to improve the difference of LCD image quality under different watching mode as claimed in claim 1 is characterized in that: this LCD is one can't adjust the LCD of brightness, color and contrast.

3. the method that is used to improve the otherness of LCD image quality under different watching mode as claimed in claim 1 is characterized in that: this spatial domain with brightness and carrier chrominance signal is the YUV territory.

4. the method that is used to improve the difference of LCD image quality under different watching mode as claimed in claim 1 is characterized in that: this spatial domain with tristimulus signal is the RGB territory.

5. the method that is used to improve the difference of LCD image quality under different watching mode as claimed in claim 1 is characterized in that: this luminance parameter value is the green gain value in the digital gain value.

6. the method that is used to improve the difference of LCD image quality under different watching mode as claimed in claim 1 is characterized in that: this color parameter value is redness and the blue gain value (R gain and B gain) in the digital gain value.

7. the method that is used to improve the difference of LCD image quality under different watching mode as claimed in claim 1 is characterized in that: this contrast level parameter value is a gamma curve.