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High-efficient image denoising algorithm and hardware realization apparatus of algorithm

A technology for image noise reduction and hardware implementation, which is applied in the field of video image processing systems, can solve additional problems, and achieve the effect of accelerating computing speed

Inactive Publication Date: 2011-08-31
SHANGHAI INFOTM MICROELECTRONICS
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Problems solved by technology

[0004] Noise is randomly distributed in the video image, so considering that inter-frame noise reduction can average the noise to multiple frames of images to achieve better results than intra-frame noise reduction, but inter-frame noise reduction often needs to store multiple frames of images, requiring additional of frame memory

Method used

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  • High-efficient image denoising algorithm and hardware realization apparatus of algorithm

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] Such as figure 1 The flow chart of the efficient noise reduction algorithm is shown. For a noisy image, a 3 by 3 matrix is ​​first formed, and the gradient pre-detection is performed. The gradient detection result is analyzed to determine whether it belongs to salt and pepper noise. If it is salt and pepper noise, enter the fast Median filter, otherwise enter the direction mean filter or directly output and save, and select the output data according to the result of gradient detection, and finally get the image after noise reduction.

[0026] Such as figure 2 The gradient detection diagram is shown. For an image, select 3 rows and 3 columns to form a 3 by 3 matrix. The central point of the matrix is ​​the pixel to be filtered. Calculate the horizontal direction, vertical direction, 45-degree direction and 135-degree direction of the pixel to be filtered. The ...

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Abstract

The present invention discloses a high-efficient image denoising algorithm and a hardware realization apparatus of the algorithm. The technical scheme comprises the steps of carrying out a gradient pre-detection of a central point of a (3*3) matrix, determining whether the noise is salt-and-pepper noise by the gradient, carrying out fast median filtering if the noise is the salt-and-pepper noise and carrying out orientation average filtering to filter Gauss noise if the noise is not the salt-and-pepper noise, and directly outputting non-noise points. The technical scheme can obtain an effect exceeding the effect of only carrying out median filtering or only carrying out average filtering under the hardware realization cost of being in need of only four rows of row cache, and has a better retentivity of image edges, and has flexible selectivity in filtering mode.

Description

Technical field: [0001] The present invention relates to a video image processing system, and more specifically relates to an efficient image noise reduction algorithm and a hardware implementation device thereof during video image processing. Background technique: [0002] In the process of shooting, processing and transmitting video image signals, it is inevitable to be disturbed by some noise. The most common types of noise are salt and pepper noise and Gaussian noise, which seriously affect the visual effect of video images, so the video images are filtered Noise reduction has become an important part of video processing system. [0003] Conventional filtering algorithms are divided into linear filtering and nonlinear filtering. Mean filtering is the most commonly used linear filtering algorithm, which can effectively filter out Gaussian noise, and at the same time make the image blurred, resulting in the loss of image edge information. For salt and pepper noise, Mean f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/21
Inventor 杨平中李兴仁王廷
Owner SHANGHAI INFOTM MICROELECTRONICS
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