WO2010054585A1

WO2010054585A1 - Method for dynamically monitoring image quality by the way of displaying the histogram exposure table on the monitor screen

Info

Publication number: WO2010054585A1
Application number: PCT/CN2009/074867
Authority: WO
Inventors: 殷惠清; 李立峰; 肖江; 林德志
Original assignee: 厦门华侨电子股份有限公司
Priority date: 2008-11-11
Filing date: 2009-11-09
Publication date: 2010-05-20
Also published as: CN101742351B; CN101742351A

Abstract

This invention discloses a method for dynamically monitoring an image quality by the way of displaying an histogram exposure table on the monitor screen, that the bright signal Y of digital television video data stream accepted by display device is divided into some bright levels in space and the pixel status distribution of the source of signal exposure is dynamically displayed on the display screen according to the content of every frame in the form of histogram by weight computation, thus the estimated reference for the image quality is provided to people and at the same time dynamically monitoring the image quality could be achieved.

Description

Instruction manual

Title of Invention: A method for dynamically monitoring image quality by displaying a histogram type exposure meter on a monitor screen

Technical field

[1] The present invention relates to the field of digital television technology, and in particular, to a method for dynamically monitoring image quality in the form of displaying a histogram type exposure meter using a monitor screen.

Background technique

[2] At present, the evaluation of standard image quality at home and abroad is completely a subjective evaluation method. In the prior art, the evaluation of images mainly relies on different subjects to score the subjective impression of image quality, and then score these. The results are statistically calculated, and the average score is obtained, which is used as the grade score of image quality. The existing image quality evaluation methods have the following drawbacks: First, there is no quantitative index for the quality of the objective image, completely Relying on subjective impressions; Second, the existing subjective evaluation methods are more accurate for static images, but the dynamic images are more divergent.

Summary of the invention

[3] The object of the present invention is to overcome the deficiencies of the prior art, and to provide a method for dynamically monitoring image quality by displaying a histogram type exposure meter on a monitor screen, which is a digital television video data stream received by a display device. The luminance signal Y is divided into a plurality of brightness levels in the spatial domain, and the pixel condition distribution of the signal source itself is displayed in a graphical histogram on the display screen by weighting operation, thereby providing a reference for evaluating the image quality. Moreover, dynamic monitoring of image quality can be achieved.

[4] The technical solution adopted by the present invention to solve the technical problem thereof is: A method for dynamically monitoring image quality by using a monitor screen to display a histogram type exposure table, comprising the following steps:

[5] a. separating, by the filtering module of the display device, the luminance signal Y of each frame in the digital television video data stream received by the display device for displaying the dynamic image;

[6] b. The level detection module of the display device divides the luminance signal Y in the separated digital television video data stream into several levels according to the pre-set hierarchical manner, and the magnitude of the luminance signal is from small to large. Separate in order; [7] c. The statistical calculation module of the display device performs statistical calculation on the pixels of each level of the luminance signal;

[8] d. The statistical calculation module of the display device performs weighting operation on the pixel values of the luminance signals of each level according to the weighting operation mode set in advance, and stores the weighted calculated data in the corresponding OS D display. Buffer storage area;

[9] e. The signal processing module of the display device processes the weighted operation data of the pixels of all levels of the luminance signal of the same frame into a display of the dynamic image that can be synchronously displayed on the frame data stream by being operated by the OSD menu. a histogram type exposure table on the interface; the histogram type exposure table includes a pixel scale for indicating brightness from the darkest to the brightest manner and corresponding to the brightness level distribution corresponding to the pixel scale a plurality of column histograms, the height of the column histogram being proportional to the pixel value of the weighting operation of the corresponding brightness level;

[10] f. The display module of the display device recalls the weighted operation value of the pixel of the brightness signal from the corresponding storage area according to the operation instruction of the OSD menu, and dynamically displays the histogram type exposure table in synchronization Corresponding to the dynamic image display interface.

[11] The OSD menu includes a menu option for opening or closing a histogram type exposure table, and the on/off menu option includes a method for synchronously displaying the histogram on a display interface of a display moving image of the display device. The option to open the pattern exposure meter and the shutdown option to exit the displayed histogram exposure meter from the display interface.

[12] The OSD menu further includes a menu option for selecting a display position of the histogram type exposure table, the position menu option includes displaying a histogram type exposure table on an upper left option of the upper left portion of the display interface, and placing the histogram The pattern exposure meter displays the upper right option at the upper right of the display interface, the lower left option for displaying the histogram type exposure meter at the lower left of the display interface, and the right lower option for displaying the histogram type exposure meter at the lower right of the display interface.

[13] A method for dynamically monitoring image quality in the form of displaying a histogram type exposure meter using a monitor screen is to pass a luminance signal Y input to a color digital video signal stream of a display device through a digital filter Separate; then use high-speed digital circuit to statistically classify the Y signal of each frame image according to its numerical value, and divide the luminance signal Y in the data stream from the smallest (darkest) to the largest (brightest) in the spatial domain as needed. a number of brightness levels; the number of pixels per level is used as a column height table It is shown that the histograms of all levels are arranged from small to large according to the brightness level. The envelope waveform of the column histogram shows the distribution of image pixels of different brightness levels, and the height of the histogram is the weighted operation value of the total pixels of each frame of image; The pixel scale below the histogram is set from small to large (darkest to brightest), indicating the position of the histogram pixel brightness level. According to the theory of digital television image, it is possible to analyze whether the exposure of the image is reasonable by the arrangement of the image pixels from the darkest to the brightest, and whether the different brightness levels are uniform, thereby judging whether the image quality meets the requirements.

[14] A method for dynamically monitoring image quality in the form of displaying a histogram type exposure meter by using a monitor screen is to dynamically display a histogram type exposure table synchronously on a display interface for displaying a moving image, the histogram The waveform parameters displayed by the exposure meter can be used as an auxiliary tool to determine the exposure accuracy of the video image. Through the histogram type exposure meter, you can understand the pixel distribution in the image, so as to know whether the dynamic range of the image pixels from the brightest to the darkest distribution is suitable. Since the present invention is a pixel real refresh statistics for each frame of images, it can be dynamically reflected. The change of the image provides the user with a solid judgment basis, which can realize dynamic monitoring of the image quality.

[15] A method for dynamically monitoring image quality in the form of displaying a histogram type exposure meter using a monitor screen, and the weighted operation mode used can normalize the 2.07 million pixels according to human visual habits. , prevents it from overflowing in the graphics and making it appear in a limited number of pixels in the OSD graphics.

[16] A method for dynamically monitoring image quality in the form of displaying a histogram type exposure meter by using a monitor screen, and displaying or closing the histogram type exposure table on the display interface can be controlled by the OSD menu mode, operation 吋, can be achieved by the following steps:

[17] ml . Go to the main menu: Select the User Settings option;

[18] m2. Enter user options submenu: Select image monitoring options;

[19] m3. Select dynamic histogram type on/off;

[20] m4. Confirmation.

[21] A method for dynamically monitoring image quality in the form of displaying a histogram type exposure meter by using a monitor screen, and displaying the display position of the histogram type exposure table through the OSD menu mode, operation 吋, This can be achieved by the following steps:

[22] nl . Go to the main menu: Select the user settings option;

[23] n2. Enter user options submenu: Select image monitoring options; [24] n3. Enter the image monitoring submenu: Select the top left, top right, bottom left, bottom right image positions;

[25] n4. Press the Enter key. The dynamic histogram exposure meter appears at the selected position on the screen.

[26] The invention has the beneficial effects of dividing the luminance signal Y in the digital television video data stream received by the display device into a plurality of brightness levels in the spatial domain, and according to each frame image on the display screen by weighting operation The content of the image is dynamically displayed in the form of a graphical histogram to reveal the pixel condition distribution of the signal source itself, so that the evaluation of the original image quality is completely determined by manual subjective evaluation, and the image quality is improved by using a graphic display method as a reference. Scientific evaluations have also enabled dynamic monitoring of image quality.

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, a method of dynamically monitoring image quality in the form of displaying a histogram type exposure table using a monitor screen is not limited to the embodiment.

DRAWINGS

[28] FIG. 1 is a schematic view showing a histogram type exposure table;

2 is a process flow diagram of the method of the present invention.

detailed description

[30] Referring to the drawings, a method for dynamically monitoring image quality in the form of displaying a histogram type exposure meter using a monitor screen includes the following steps:

[31] a. separating, by the filtering module of the display device, the luminance signal Y of each frame in the digital television video data stream received by the display device for displaying the dynamic image;

[32] b. The level detection module of the display device divides the luminance signal Y in the separated digital television video data stream into 16 levels according to a pre-set hierarchical manner, that is, divided into 16 levels as shown in FIG. The brightness signal is detected, and the magnitudes of the brightness signals are arranged in order from small to large;

[33] c The statistical calculation module of the display device performs statistical calculation on the pixels of the luminance signal of each level separately;

[34] d. The statistical calculation module of the display device performs weighting operation on the pixel values of the luminance signals of each level according to the weighting operation mode set in advance, and stores the weighted calculated data in the corresponding OS D display. Buffer storage area;

[35] e. The signal processing module of the display device weights the pixels of all levels of luminance signals of the same frame. The calculated data is processed into a histogram type exposure table that can be operated by the OSD menu to be synchronously displayed on the display interface of the moving image generated by the frame data stream; the histogram type exposure table is included to indicate that the brightness is darkest a pixel scale arranged to the brightest mode and a plurality of column histograms corresponding to the brightness level distribution corresponding to the pixel scale, the height of the column histogram and the pixel value of the weighting operation of the corresponding brightness level Proportion

[36] f. The display module of the display device recalls the weighted operation value of the pixel of the brightness signal from the corresponding storage area according to the operation instruction of the OSD menu, and dynamically displays the histogram type exposure table in synchronization Corresponding to the dynamic image display interface.

[37] The menu item for opening or closing the histogram type exposure table is included in the OSD menu, and the on/off menu option includes a method for synchronously displaying the histogram on the display interface of the display moving image of the display device. The open option of the exposure meter and the close option for exiting the displayed histogram exposure meter from the display interface.

[38] When you need to display the histogram exposure meter on the display interface, you can do this by the following steps:

[39] ml . Go to the main menu: Select the User Settings option;

[40] m2. Enter user options submenu: Select image monitoring options;

[41] m3. Select dynamic histogram to open;

[42] m4. Confirmation.

[43] When you need to exit the histogram exposure meter that has been displayed on the display interface, you can do this by the following steps:

[44] ml . Go to the main menu: Select the User Settings option;

[45] m2. Enter User Options submenu: Select Image Monitoring Options;

[46] m3. Select dynamic histogram type off;

[47] m4. Confirmation.

[48] The OSD menu also includes a menu option for selecting the display position of the histogram type exposure table. The position menu option includes an upper left option for displaying the histogram type exposure meter at the upper left of the display interface, and a histogram type. The exposure meter displays the upper right option at the upper right of the display interface, the lower left option for displaying the histogram type exposure meter at the lower left of the display interface, and the lower right option for displaying the histogram type exposure meter at the lower right of the display interface. [49] In the display state of the histogram type exposure meter, the display position of the histogram type exposure meter can be adjusted through the OSD menu, and the adjustment is performed by the following operation steps:

[50] nl . Enter the main menu: Select the user settings option;

[51] n2. Enter user options submenu: Select image monitoring options;

[52] n3. Enter the image monitoring submenu: Select the top left, top right, bottom left, bottom right image positions;

[53] n4. Press the Enter key. The dynamic histogram exposure meter appears at the selected position on the screen.

[54] A method for dynamically monitoring image quality in the form of displaying a histogram type exposure meter using a monitor screen is to pass a luminance signal Y input to a color digital video signal stream of a display device through a digital filter Separate; then use high-speed digital circuit to statistically classify the Y signal of each frame image according to its numerical value, and divide the luminance signal Y in the data stream from the smallest (darkest) to the largest (brightest) in the spatial domain as needed. 16 brightness levels; the statistics of each level of pixels are expressed in column height, all levels of histogram are arranged from small to large according to the brightness level (as shown in Figure 1), and the envelope waveform of the column histogram shows different brightness. The distribution of the pixel of the level image, the height of the histogram is the weighted operation value of the total pixels of each frame of the image; the pixel scale of the arrangement from the smallest to the largest (the darkest to the brightest) under the histogram, indicating the brightness level of the histogram pixel Where it is. According to the theory of digital television image, it is possible to analyze whether the exposure of the image is reasonable and whether the brightness levels are uniform by the image pixels from the darkest to the brightest arrangement, thereby judging whether the image quality meets the requirements.

[55] A method for dynamically monitoring image quality in the form of displaying a histogram type exposure meter by using a monitor screen is to dynamically display a histogram type exposure table synchronously on a display interface for displaying a moving image, the histogram The waveform parameters displayed by the exposure meter can be used as an auxiliary tool to determine the exposure accuracy of the video image. Through the histogram type exposure meter, you can understand the pixel distribution in the image, so as to know whether the dynamic range of the image pixels from the brightest to the darkest distribution is suitable. Since the present invention is a pixel real refresh statistics for each frame of images, it can be dynamically reflected. The change of the image provides the user with a solid judgment basis, which can realize dynamic monitoring of the image quality.

[56] A method for dynamically monitoring image quality in the form of displaying a histogram type exposure meter using a monitor screen, and the weighted operation mode used can normalize the 2.07 million pixel weight according to human visual habits. , prevents it from overflowing in the graphics and making it appear in a limited number of pixels in the OSD graphics. Industrial applicability [57] The present invention provides a method for dynamically monitoring image quality in the form of displaying a histogram type exposure meter on a monitor screen, which is to divide the luminance signal Y in the digital television video data stream received by the display device into a plurality of brightness in the spatial domain. Level, through the weighting operation, dynamically display the pixel condition distribution of the signal source itself in a graphical histogram according to the content of each frame image on the display screen, thereby providing people with reference for evaluating the image quality. Realize dynamic monitoring of image quality and have good industrial applicability.

Claims

Claim

[Claim 1] A method for dynamically monitoring image quality in the form of displaying a histogram type exposure meter on a monitor screen, comprising: the following steps:

a. separating, by the filtering module of the display device, the luminance signal Y of each frame in the digital television video data stream received by the display device for displaying the dynamic image; b. the level detecting module of the display device is separated The luminance signal Y in the digital television video data stream is divided into several levels according to a pre-set hierarchical manner, and is arranged in order from small to large according to the magnitude of the luminance signal;

c The statistical calculation module of the display device performs statistical calculation on the pixels of the luminance signal of each level respectively;

d. The statistical calculation module of the display device performs weighting operation on the pixel values of the luminance signals of each level according to the weighting operation mode set in advance, and stores the weighted calculated data in the corresponding OSD display buffer storage area. ;

e. The signal processing module of the display device processes the weighted operation data of the pixels of the luminance signals of all levels of the same frame into a display interface that can be synchronously displayed on the display interface of the dynamic image generated by the frame data stream by being operated by the OSD menu. a histogram type exposure table; the histogram type exposure table includes a pixel scale for indicating brightness from the darkest to the brightest manner, and a plurality of columns corresponding to the brightness level distribution corresponding to the pixel scale a histogram, the height of the histogram is proportional to the pixel value of the weighting operation of the corresponding brightness level;

f. The display module of the display device calls the weighted operation value of the pixel of the brightness signal from the corresponding storage area according to the operation instruction of the OSD menu, and dynamically displays the histogram type exposure table in the corresponding dynamic state synchronously The image is displayed on the interface.

[Claim 2] The method for dynamically monitoring image quality in the form of displaying a histogram type exposure table by using a monitor screen according to claim 1, wherein: the OSD menu includes a method for opening or closing a histogram a menu option of the pattern exposure table, the on/off menu option includes an opening option for synchronously displaying the histogram type exposure table on a display interface of a display moving image of the display device and for implementing the displayed The histogram exposure meter exits the close option of the display interface.

[Claim 3] The method for dynamically monitoring image quality in the form of displaying a histogram type exposure meter by using a monitor screen according to claim 2, wherein: the OSD menu further includes a histogram for selecting a histogram. The menu option of the display position of the type exposure meter, the position menu option includes an upper left option for displaying the histogram type exposure table on the upper left side of the display interface, and an upper right option for displaying the histogram type exposure meter on the upper right portion of the display interface, The histogram type exposure meter displays the lower left option at the lower left of the display interface and the lower right option of the histogram type exposure table at the lower right of the display interface.