Self-adaptive noise intensity estimation method based on encoder frame work

An adaptive, noise-intensive technology, applied in instrumentation, computing, image data processing, etc., can solve the problems of underestimation and overestimation, achieve accurate estimation, overcome the phenomenon of underestimation and overestimation, and achieve low computational complexity. Effect

Inactive Publication Date: 2009-08-12
上海视涛电子科技有限公司
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Problems solved by technology

Underestimation or overestimation generally

Method used

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  • Self-adaptive noise intensity estimation method based on encoder frame work
  • Self-adaptive noise intensity estimation method based on encoder frame work
  • Self-adaptive noise intensity estimation method based on encoder frame work

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Embodiment Construction

[0020] The specific embodiment of the present invention is described in detail below in conjunction with the accompanying drawings, and the texture complexity analysis method of an 8x8 block is as follows:

[0021] Divide each 8 x 8 block into four 4 x 4 blocks, such as figure 2 shown. with S 00 , S 01 , S 10 , S 11 Respectively represent the average strength of the corresponding block, calculated as follows:

[0022] S uv = 1 16 Σ i = 0 3 Σ j = 0 3 p ( 4 u + i , 4 v + j ) , u , v = 0,1 ...

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Abstract

The invention relates to an encoder frame-based and self-adaptive method for estimating noise intensity, which comprises the following steps: firstly, segmenting a frame of image into a series of non-superimposed blocks, performing the texture analysis of each block and removing all blocks with textures; calculating a minimum noise standard difference of consistent blocks; selecting consistent blocks with the smallest difference between the standard differences of the consistent blocks and the minimum standard difference, and performing the Gaussian filtration of the blocks; calculating a difference between an original block and an image subjected to noise filtration; and estimating noise standard difference as the average of the standard differences of the differential blocks. The technical method of the invention uses a video image encoder to quick calculate the value of the intensity of interference noises without influencing the speed of the encoder substantially.

Description

technical field [0001] The invention relates to the technical field of digital image processing, in particular to the occasion of performing noise correlation estimation and processing on images disturbed by noise during image processing. Background technique [0002] In applications such as image quality enhancement, denoising filtering, improving compression efficiency, motion estimation, and motion segmentation, special attention needs to be paid to the presence of noise in images. If the prior knowledge of the noise intensity in the image can be obtained in advance, it will be of great help to the above processing and encoding. Therefore, it is necessary to accurately estimate the noise of the image. [0003] Noise in video sequences can be estimated by intra-frame or inter-frame estimation methods. The intra-frame noise estimation method belongs to the spatial domain estimation, while the inter-frame estimation method belongs to the time domain estimation. The intra-...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T7/40
Inventor 朝晖苏晶桂义才
Owner 上海视涛电子科技有限公司
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