CN112601080B - Method for judging television monochromatic field signal - Google Patents
Method for judging television monochromatic field signal Download PDFInfo
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- CN112601080B CN112601080B CN202011460316.0A CN202011460316A CN112601080B CN 112601080 B CN112601080 B CN 112601080B CN 202011460316 A CN202011460316 A CN 202011460316A CN 112601080 B CN112601080 B CN 112601080B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/04—Diagnosis, testing or measuring for television systems or their details for receivers
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- H—ELECTRICITY
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/02—Diagnosis, testing or measuring for television systems or their details for colour television signals
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Abstract
The invention relates to the technical field of television image signal processing, in particular to a method for judging a television monochromatic field signal, which solves the problem that the optical performance of a television product cannot be accurately shown due to the influence of partial functions of the television product on the monochromatic field signal, and greatly improves the accuracy of identifying the monochromatic field signal. The technical scheme is summarized as acquiring histogram data of YUV format signals of a television display picture; then judging whether the display signal is a signal of the same brightness order or not according to the histogram data, and if so, acquiring R, G, B data of the RGB format signal at the fixed position of the television display picture; and judging a monochrome field signal of the current picture according to R, G, B data, and finally performing distinguishing processing on part of functions of the whole television aiming at the monochrome field signal according to the detection and judgment of the monochrome field signal. The invention is suitable for judging the monochromatic field signal.
Description
Technical Field
The invention relates to the technical field of television image signal processing, in particular to a method for judging a television monochromatic field signal.
Background
In order to enable liquid crystal television products to meet the requirements of national energy efficiency standards and solve the problems of light leakage and the like of the liquid crystal television products, various television companies develop a dynamic backlight function for adjusting backlight brightness. In addition, the dynamic contrast function of the whole television can also dynamically adjust the brightness of the monochromatic field signal. At present, the television products of various television companies leave factories to set the dynamic backlight function and the dynamic contrast function to be on by default. When some image signals are played, such as monochrome field signals of a red field, a blue field, a green field, a white field and the like, the backlight of the whole machine is reduced by the dynamic backlight adjusting function, and the brightness of the signals is adjusted by the dynamic contrast function, so that the image brightness is reduced.
The single color field signals of the red field, the blue field, the green field, the white field and the like can test index parameters used for detecting the optical performance of a television product, such as peak brightness, a brightness curve, color gamut coverage rate and the like of the whole television. If the brightness of the backlight is reduced when the signals are played and the brightness of the image signals is adjusted, the optical performance of the whole television cannot be really displayed to customers, the recognition deviation of the customers on television products is caused, and even the sale of the television products is influenced, so that the difference of the generated monochromatic field signals can be correctly processed only by accurately identifying the monochromatic field signals of the television products.
Disclosure of Invention
The invention aims to provide a method for judging a television monochromatic field signal, which solves the problem that the optical performance of a television product cannot be accurately shown due to the influence of partial functions of the television product on the monochromatic field signal, and greatly improves the accuracy of identifying the monochromatic field signal.
The invention adopts the following technical scheme to realize the purpose, and the method for judging the television monochromatic field signal comprises the following steps:
the method comprises the steps of (1) acquiring histogram data of YUV format signals of a television display picture;
step (2), judging whether the display signals are signals of the same brightness order according to the histogram data, and entering step (3) if the display signals are signals of the same brightness order; otherwise, finishing the judgment;
step (3), R, G, B data of RGB format signals at a fixed position of a television display picture are obtained;
and (4) judging the monochrome field signal of the current picture according to the R, G, B data.
And (5) according to the detection and judgment of the monochrome field signal, carrying out distinguishing processing on partial functions of the whole television aiming at the monochrome field signal.
Further, in step (1), the specific method for acquiring histogram data of YUV format signals of a television display screen includes: acquiring 32-bit histogram data of a current display picture from a television core, recording the 32-bit histogram data as Yn, wherein n is 0, 1, … and 31, and recording the sum of the 32-bit histogram data as Max.
Further, in step (2), the specific method for determining whether the display signals are signals of the same brightness level includes:
step 201, calculating two adjacent bits of the 32-bit histogram data to generate 31 data, where PLn ═ Y is calculated asn+Yn+1，n＝0，1，2…29，30；
Step 202, judging PLn, and if PLn is Max, judging that the image levels of the current display picture are the same and the display contents are the same brightness level; if PLn is less than Max, the image level of the current display frame is judged to have difference, and the display content has different brightness levels.
Further, in step (3), the specific method for acquiring R, G, B data of RGB format signals at fixed positions on the display screen of the television comprises:
after converting the image signal into RGB format, capturing multipoint R, G, B data at fixed position;
the fixed position is set after the YUV format signal is converted into RGB format signal by CSC module, and before the nonlinear parameters Brightness, Contrast, Hue and Saturration are set.
Further, in step (4), the specific method for determining the monochrome field signal of the current picture according to the R, G, B data includes:
judging R, G, B data;
if the grab R, G, B data satisfies: judging that the current display picture is a gray field signal if R is G or B, and judging the brightness level of the gray field according to the value of R, G, B;
if the grab R, G, B data satisfies: if R is not equal to 0, G is 0 and B is 0, judging that the current display picture is a red field signal, and judging the brightness level of the red field according to the value of R;
if the grab R, G, B data satisfies: if R is 0, G is not equal to 0 and B is 0, judging that the current display picture is a green field signal, and judging the brightness level of the green field according to the value of G;
if the grab R, G, B data satisfies: and if R is 0, G is 0 and B is not 0, judging that the current display picture is a blue field signal, and judging the brightness level of the blue field according to the value of B.
Further, in step (4), the specific method for determining the monochrome field signal of the current picture according to the R, G, B data further includes: according to different combinations of R, G, B values, the monochrome field signal of the current display picture is judged to comprise a cyan field signal, a purple field signal, a yellow field signal and a skin color field signal.
The invention judges the monochrome field signal by combining the histogram data and the RGB data of the television product, and judges according to different R, G, B data values only on the premise of meeting the signal of the same brightness level, the method is simple and reliable, and the accuracy of identifying the monochrome field signal is greatly improved.
Drawings
Fig. 1 is a schematic diagram of the image signal acquisition data of the television core of the invention.
FIG. 2 is a flow chart of a method for determining a television monochrome field signal according to the present invention.
Detailed Description
The invention relates to a method for judging a television monochromatic field signal, which comprises the following steps:
the method comprises the steps of (1) acquiring histogram data of YUV format signals of a television display picture;
step (2), judging whether the display signals are signals of the same brightness order according to the histogram data, and entering step (3) if the display signals are signals of the same brightness order; otherwise, finishing the judgment;
step (3), R, G, B data of RGB format signals at a fixed position of a television display picture are obtained;
and (4) judging the monochrome field signal of the current picture according to the R, G, B data.
And (5) according to the detection and judgment of the monochrome field signal, carrying out distinguishing processing on partial functions of the whole television aiming at the monochrome field signal.
In the step (1), the specific method for acquiring the histogram data of the television display picture YUV format signal comprises the following steps: acquiring 32-bit histogram data of a current display picture from a television core, recording the 32-bit histogram data as Yn, wherein n is 0, 1, … and 31, and recording the sum of the 32-bit histogram data as Max.
The schematic diagram of the image signal acquisition data of the television core is shown in fig. 1, a video signal is decoded by a Decoder, sent to a Digital Interface (DI) for de-interlacing, an interlaced signal is converted into a progressive signal, then signal Scaling is carried out sequentially by Scaling, signals with different resolutions are compressed or expanded to be matched with the physical resolution of a display screen, sharpness adjustment is carried out by sharpen, dynamic brightness adjustment is carried out by Digital Logic (DLC), color space conversion is carried out by a computer program control (CSC), and nonlinear parameters including brightness, contrast, hue, saturation and the like are adjusted by a line of sight (NLA);
the histogram data is captured at the time of dynamic brightness adjustment by DLC, and R, G, B data is captured before NLA adjustment after color space conversion by CSC.
In step (2), the specific method for judging whether the display signals are signals of the same brightness order includes:
step 201, respectively dividing the 32-bit histogramTwo adjacent bits of the graph data are calculated to generate 31 data, and the calculation formula is that PLn is Yn+Yn+1，n＝0，1，2…29，30；
Step 202, judging PLn, and if PLn is Max, judging that the image levels of the current display picture are the same and the display contents are the same brightness level; if PLn is less than Max, the image level of the current display frame is judged to have difference, and the display content has different brightness levels.
In step (3), the specific method for acquiring R, G, B data of RGB format signals at a fixed position on a television display screen includes:
after converting the image signal into RGB format, capturing multipoint R, G, B data at fixed position;
the fixed position is set after the YUV format signal is converted into the RGB format signal by the CSC module, and before the nonlinear parameters Brightness, Contrast, Hue and Saturration are set, the captured RGB value is not influenced by the nonlinear parameters.
In step (4), the specific method for determining the monochrome field signal of the current picture according to the R, G, B data includes:
judging R, G, B data;
if the grab R, G, B data satisfies: if R is G or B, the current display picture is judged to be a gray field signal, and the luminance level of the gray field can be judged according to the value of R, G, B;
if the grab R, G, B data satisfies: if R is not equal to 0, G is 0 and B is 0, the current display picture is judged to be a red field signal, and the brightness level of the red field can be judged according to the value of R;
if the grab R, G, B data satisfies: if R is 0, G is not equal to 0 and B is 0, judging that the current display picture is a green field signal, and judging the brightness level of the green field according to the value of G;
if the grab R, G, B data satisfies: and R is 0, G is 0, B is not 0, the current display picture is judged to be a blue field signal, and the brightness level of the blue field can be judged according to the value of B.
In step (4), the specific method for determining the monochrome field signal of the current picture according to the R, G, B data further includes: according to different combinations of R, G, B values, the monochrome field signal of the current display picture is judged to comprise a cyan field signal, a purple field signal, a yellow field signal and a skin color field signal.
The method for judging television monochromatic field signal of the invention, as shown in fig. 2, first captures histogram data, which is recorded as Yn, then judges whether the display signal is a signal of the same brightness order according to the histogram data, if so, captures R, G, B data of RGB format signal, otherwise, directly receives the judgment, then judges color according to the RGB data, determines that the display signal is a single field display signal, and finally sets partial television function to process the single field signal difference.
The embodiment of the invention comprises the following steps:
taking the case that a television complete machine using a core of a certain company plays 4K images, the method comprises the following implementation steps:
a. respectively obtaining the histogram data of YUV format signals of 4K image pictures displayed by a television as Yn(n-0, 1, …, 31); the sum of the 32-bit histogram data is recorded as 48740;
b. according to PLn＝Yn+Yn+1N is 0, 1, 2 … 29, 30 respectively, and two adjacent bits of the 32-bit histogram data of each 4K image frame are statistically calculated, so as to obtain the following values:
from the above table data, the PL corresponding to image 1 is determinednAll fail to satisfy PLn48740, determining that the image levels of the image 1 are different, and ending the image 1 determination flow;
from the above table data, the PL corresponding to image 2 is determinednData PL2148740, judging that the image level of the image 2 is the same, and continuing the subsequent judgment flow for the image 2;
from the above table data, the PL corresponding to image 3 is determinednData PL30＝48740, judging that the image levels of the images 3 are the same, and continuing the subsequent judgment flow of the images 3;
c. after the YUV format signal is converted into RGB format signal by CSC module, and before nonlinear parameters Brightness, Contrast, Hue and Saturration, R, G, B data of central point position of TV display picture is captured, the following table values are obtained, R, G, B data range is 0-1023:
| RGB format signal data | Image 2 | Image 3 |
| R data | 0 | 1023 |
| G data | 1023 | 1023 |
| B data | 0 | 1023 |
d. According to R, G, B, the image 2 is a green field signal, and the brightness level is 100%;
if the G data of the image 2 picture is 512 and the R, B data are both 0, the image 2 picture can be judged to be a green field signal with 50% brightness level;
according to R, G, B, the image 3 is a white field signal, and the brightness level is 100%;
e. the image 2 is detected and judged to be a green field, the image 3 is a full white field, when the images 2 and 3 can be adjusted and played, the dynamic backlight function and the dynamic contrast function are closed, the backlight of the whole television is not reduced, the graphic signals are not adjusted, and the optical performance of the whole television can be accurately reflected at the moment.
In conclusion, the current image is judged through the histogram and the RGB data, and whether the displayed image is a monochromatic field or not is finally confirmed, so that the problem that the optical performance parameters of the whole television are influenced by the functions of the whole television is solved, the optical performance of the whole television can be accurately displayed, and the market competitiveness of the television is improved.
Claims (5)
1. A method for determining a television monochrome field signal, comprising:
the method comprises the following steps of (1) obtaining histogram data of YUV format signals of a television display picture, and the specific method comprises the following steps: acquiring 32-bit histogram data of a current display picture from a television core, recording the 32-bit histogram data as Yn, wherein n is 0, 1, … and 31, and recording the sum of the 32-bit histogram data as Max;
step (2), judging whether the display signals are signals of the same brightness order according to the histogram data, and entering step (3) if the display signals are signals of the same brightness order; otherwise, finishing the judgment;
step (3), R, G, B data of RGB format signals at a fixed position of a television display picture are obtained;
step (4), judging a monochromatic field signal of the current picture according to R, G, B data;
and (5) according to the detection judgment of the monochromatic field signal, if the picture is judged to be the monochromatic field signal, closing the dynamic backlight function and the dynamic contrast function.
2. The method according to claim 1, wherein in step (2), the specific method for determining whether the display signals are signals of the same brightness level comprises:
step 201, calculating two adjacent bits of the 32-bit histogram data to generate 31 data, where PLn ═ Y is calculated asn+Yn+1，n＝0，1，2…29，30；
Step 202, judging PLn, and if PLn is Max, judging that the image levels of the current display picture are the same and the display contents are the same brightness level; if PLn is less than Max, the image level of the current display frame is judged to have difference, and the display content has different brightness levels.
3. The method for determining tv monochrome field signal according to claim 1 or 2, wherein in step (3), the specific method for obtaining R, G, B data of RGB format signal with fixed position of tv display picture comprises:
after converting the image signal into RGB format, capturing multipoint R, G, B data at fixed position;
the fixed position is set after the YUV format signal is converted into RGB format signal by CSC module, and before the nonlinear parameters Brightness, Contrast, Hue and Saturration are set.
4. The method of claim 3, wherein in step (4), the specific method of determining the monochrome field signal of the current picture according to the R, G, B data comprises:
judging R, G, B data;
if the grab R, G, B data satisfies: judging that the current display picture is a gray field signal if R is G or B, and judging the brightness level of the gray field according to the value of R, G, B;
if the grab R, G, B data satisfies: if R is not equal to 0, G is 0 and B is 0, judging that the current display picture is a red field signal, and judging the brightness level of the red field according to the value of R;
if the grab R, G, B data satisfies: if R is 0, G is not equal to 0 and B is 0, judging that the current display picture is a green field signal, and judging the brightness level of the green field according to the value of G;
if the grab R, G, B data satisfies: and if R is 0, G is 0 and B is not 0, judging that the current display picture is a blue field signal, and judging the brightness level of the blue field according to the value of B.
5. The method for determining the monochrome field signal of TV set as claimed in claim 4, wherein in step (4), the specific method for determining the monochrome field signal of the current picture according to R, G, B data further comprises: according to different combinations of R, G, B values, the monochrome field signal of the current display picture is judged to comprise a cyan field signal, a purple field signal, a yellow field signal and a skin color field signal.
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