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Visual entropy acquisition method and device

An acquisition method and visual technology, applied in the computer field, can solve the problems of inaccurate calculation results, inability to truly reflect the complexity of the image area, and failure to measure the probability distribution.

Active Publication Date: 2015-09-23
HUAWEI TECH CO LTD
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  • Application Information

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Problems solved by technology

The existing visual entropy calculation method only considers the richness of the pixel values ​​of each pixel in the specified image area, that is, it measures the probability distribution of the texture intensity of each pixel, but does not measure the texture direction of each pixel in the specified image area. Therefore, the visual entropy calculation method has certain limitations, and the calculation results are not accurate, and cannot truly reflect the complexity of the specified image area.

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  • Visual entropy acquisition method and device
  • Visual entropy acquisition method and device

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Embodiment approach

[0204] In the first embodiment, the second determining module 102 is configured to calculate the joint entropy of the texture direction and texture intensity corresponding to all target pixels in the specified image area, and use the joint entropy as the specified image Visual entropy of the area;

[0205] The visual entropy can be the joint entropy of the texture direction and texture intensity corresponding to each target pixel. The specific calculation method can be, assuming that the number of target pixels is N, the texture direction and texture intensity corresponding to all target pixels are respectively Dn and Sn (n=1,…,N, N> 1, N is a positive integer), for the N sets of texture directions and texture strengths, the second determining module 102 calculates the joint entropy of the texture direction and texture strength as the visual entropy E of the specified image area, namely:

[0206] E = - X i X j p ( d i , s j ) log p ( ...

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Abstract

An embodiment of the invention discloses a visual entropy acquisition method and device. The method includes: acquiring at least two target pixel points in a designed image area; determining a texture direction and texture intensity corresponding to each target pixel point; and determining entropy of the texture direction and the texture intensity corresponding to each target pixel, and obtaining a visual entropy of the designated image area according all entropy. By adoption of the visual entropy acquisition method, not only is the texture direction of each target pixel point considered, the texture intensity of each target pixel point is also considered, the acquired visual entropy is high in accuracy, and can truly reflect the complexity of the designated image area.

Description

Technical field [0001] The invention relates to the field of computer technology, in particular to a method and device for obtaining visual entropy. Background technique [0002] The image is composed of multiple pixels, and the pixels in the image are usually obtained by sampling the shooting scene. In different designated image areas in the image, because the pixels that make up the designated image area are different, the complexity of different designated image areas is different. When the distorted signal of the same physical strength (for example, the same mean square error) appears in different complex Different visual intensities will appear on the designated image area. Visual experiments have found that when the designated image area is more complex, the distortion appearing on the designated image area is more difficult to be found. This phenomenon is called entropy masking effect. In practical applications, in order to obtain the entropy masking effect of a specifie...

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Application Information

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IPC IPC(8): G06T7/40
Inventor 赵寅杨海涛周炯
Owner HUAWEI TECH CO LTD