Adaptive hybrid noise reduction method for CMOS image sensor noise reduction processing

An image sensor and noise reduction processing technology, which is applied in image data processing, image enhancement, instruments, etc., can solve problems such as unfavorable hardware implementation, mean and median filtering cannot achieve the expected effect alone, and high complexity

Active Publication Date: 2016-01-20
UNITED MICROELECTRONICS CENT CO LTD
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Problems solved by technology

[0004] For the mixed noise composed of Gaussian noise and salt-and-pepper noise, neither the mean nor the median filter alone can achieve the desired effect, and in the prior art, the complexity of the method used to deal with the mixed noise is high, which is not conducive to hardware implementation

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  • Adaptive hybrid noise reduction method for CMOS image sensor noise reduction processing
  • Adaptive hybrid noise reduction method for CMOS image sensor noise reduction processing
  • Adaptive hybrid noise reduction method for CMOS image sensor noise reduction processing

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[0056] An adaptive hybrid noise reduction method for CMOS image sensor noise reduction processing, including the image output by the CMOS image sensor, the image is composed of three types of R, G, and B pixel units, and its innovation lies in: the self Adaptive hybrid denoising methods include:

[0057] In the image, an array composed of a single type of pixel unit is recorded as a processing unit (see figure 2 , the array shown in the figure is the R, G, and B pixel arrays used to form the image, and the processing unit, that is, one of R, G, or B, is an array formed by the positional relationship shown in the figure; The subscripts in R, G, or B represent the row and column where they are located), wherein, the processing unit corresponding to the R-type pixel unit is denoted as processing unit 1, and the processing unit corresponding to the G-type pixel unit is denoted as Processing unit 2, the processing unit corresponding to the B-type pixel unit is recorded as process...

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Abstract

The invention discloses an adaptive hybrid noise reduction method for CMOS image sensor noise reduction processing. According to the adaptive hybrid noise reduction method, an image outputted by a CMOS image sensor comprises R, G and B three types of pixel units. The adaptive hybrid noise reduction method is characterized in that, noise reduction processing with high efficiency on mixed noise can be realized through the adaptive hybrid noise reduction method. The adaptive hybrid noise reduction method is advantaged in that, processing complexity is relatively low, the processing effect is further realized, and hardware cost is greatly reduced.

Description

technical field [0001] The invention relates to a CMOS image sensor noise reduction technology, in particular to an adaptive hybrid noise reduction method for CMOS image sensor noise reduction processing. Background technique [0002] The current single-chip color CMOS image sensor converts the light signal into an electrical signal through the pixel unit after being photosensitive by the CFA (ColorFilterArray) array. After a series of analog circuits and digital image processing, even in the process of image transmission and display , will inevitably introduce interference noise, resulting in a decrease in image quality and affecting the visual effect. Therefore, in order to truly display image information and avoid image distortion, noise reduction processing must be performed on noisy images. [0003] Under normal circumstances, the most common image noises are Gaussian noise and salt and pepper noise. For these two kinds of image noise problems, the commonly used denois...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 李明李梦萄刘昌举
Owner UNITED MICROELECTRONICS CENT CO LTD
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