Noise estimation based partial image filtering method

A technology of local filtering and filtering processing, applied in image communication, components of color TV, components of TV systems, etc., can solve the problems of complex calculation, large amount of calculation, unfavorable real-time image processing, etc., to improve processing efficiency, Ensure image quality, maintain sharpening effect

Active Publication Date: 2008-07-02
ANYKA (GUANGZHOU) MICROELECTRONICS TECH CO LTD
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Problems solved by technology

However, the above method is complex to calculate and has a large amount of calculation, which is not conducive to real-time image processing.
And it can only be effective for a specific noise, such as salt and pepper noise, white noise, etc.

Method used

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  • Noise estimation based partial image filtering method
  • Noise estimation based partial image filtering method
  • Noise estimation based partial image filtering method

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Embodiment Construction

[0028] Such as figure 1 Shown is the system application block diagram of image data processing. The image sensor transmits the collected image data to the data bus, and the image processing module performs various processing on the data on the data bus, and the processed data is transmitted to the display module for display or stored in the data storage module via the data bus.

[0029] Such as figure 2 Shown is a schematic diagram of image local filtering processing based on noise estimation. The image acquisition module transmits the acquired image data to the filter processing module for filter processing. Since the filter module only processes digital signals, if the image output by the image acquisition module is an analog signal, the analog signal needs to be converted through an analog / digital signal conversion module to make the output a digital signal; if the image output by the image acquisition module is a digital signal , then filter directly. The filtered ima...

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Abstract

The invention discloses a method for filtering a partial image based on a noise estimation, which comprises the following the steps: (1) selecting a pixel as a central pixel in the image; (2) selecting a pixel area with a size of M*N in the center of the selected central pixel; (3) obtaining averages R, G, B of a red component (R), a green component (G) and a blue component (B) of all pixel in the selected area; (4) obtaining a sum of squares between the G and the different of G component of all pixel in the selected area, and obtaining a corresponding mean square deviation SE; (5) according to the R, G, B, and the mean square deviation SE, adjusting a corresponding pixel color value and obtaining the filtered corresponding color component; (6) carrying out an iterative processing to the whole image according to the method and then obtaining a filtered image as well as storing the image data. The invention can effectively estimate a noise signal in the image and maintains a sharpening effect in the image edge details and has an effective application in a real-time system.

Description

technical field [0001] The invention relates to a filter processing method, in particular to a noise estimation-based image local filter processing method. Background technique [0002] The noise of digital images mainly comes from the image acquisition (digitization process) and transmission process. The working condition of the image sensor (Image Sensor) is affected by various factors, such as the environmental conditions in image acquisition and the quality of the sensing components themselves. For example, using a CCD camera to acquire images, the level of light and the temperature of the sensor are the main factors that generate a lot of noise in the generated image. The image is mainly affected by noise during the transmission process due to the interference of the transmission channel used. For example, images transmitted over a wireless network may be contaminated by interference from light or other atmospheric factors. [0003] The filtering process is to remove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/217H04N5/21H04N9/64
Inventor 杨祥勇
Owner ANYKA (GUANGZHOU) MICROELECTRONICS TECH CO LTD
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