Method and device for adjusting television image
A technology for image adjustment and TV, applied in the direction of TV, color TV, color TV components, etc., can solve the problems of blurred edges and poor noise filtering effect, and achieve the effect of filtering noise.
Inactive Publication Date: 2010-12-08
MSTAR SOFTWARE R&D (SHENZHEN) LTD +1
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Problems solved by technology
The disadvantage of Li's filter is that its noise filtering effect is not good, and the edge part is easily blurred by averaging
Method used
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example 1
[0051] Example 1. 3×3 image screen: brightness average value = 64, brightness variation value = 10
[0052] →m1=e -K(10 / 4096) , m2=e -K(20 / 4096)
example 2
[0053] Example 2. 3×3 image screen: brightness average value = 64, brightness variation value = 100
[0054] →m1=e -K(100 / 4096) , m2=e -K(200 / 4096)
example 3
[0055] Example 3.3×3 image screen: average brightness value=128, brightness variation value=10
[0056] →m1=e -K(10 / 16384) , m2=e -K(20 / 16384)
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The invention discloses a method and a device for adjusting a television image, which can be used for effectively filtering the noise of the television image and maintaining remarkable edge parts. The method comprises the following steps of: carrying out variance operation on brightness values of adjacent pixels of a plurality of target pixels of an image frame so as to generate a weight index value; carrying out the decay function according to a weight index value so as to generate weight value distribution corresponding to the adjacent pixel of the equal target pixel, wherein the function value of the decay function is in inverse proportion to the weight index value and is in inverse proportion to the target pixel distance of the adjacent pixel of the equal target pixel, and the target pixel distance of the adjacent pixel of the equal target pixel is the sum of the vertical distance and the horizontal distance of the adjacent pixel of the equal target pixel and the target pixel; and carrying out the weighing operation on the brightness value of the adjacent value of the equal target pixel so as to generate the brightness value of an output pixel.
Description
technical field [0001] The invention relates to television image processing, in particular to a method and device for television image noise processing. Background technique [0002] In the reception of TV images, due to various types of interference in the transmission process and the discontinuous block effect caused by image compression coding, the TV image is inevitably noisy, and the discontinuous block effect can be regarded as high frequency noise. In order to eliminate the noise of the TV image signal, the general practice is to use a low-pass filter to filter out the high-frequency components of the image signal, and to smooth the discontinuous area caused by the block effect. However, in the filtering process, although the noise is reduced, some edge parts formed by the boundary of two groups of different pixel brightness values are blurred due to smoothing. [0003] In order to solve this problem, there are existing non-linear correspondence techniques---Gamma...
Claims
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IPC IPC(8): H04N5/14H04N5/21H04N5/57
Inventor 陈美如吴振禧
Owner MSTAR SOFTWARE R&D (SHENZHEN) LTD
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