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Method for eliminating image noise

A technology for noise elimination and imaging, which is used in image communication, TV, color TV components, etc., and can solve problems such as no luminance noise and color noise suppression.

Inactive Publication Date: 2013-05-15
NOVATEK MICROELECTRONICS CORP
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  • Abstract
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Problems solved by technology

[0005] However, in traditional image processing, there is no effective suppression of luminance noise and color noise

Method used

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  • Method for eliminating image noise
  • Method for eliminating image noise

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Embodiment Construction

[0036] The invention provides an image processing mechanism. In the coordinate space (domain) of YCbCr, an arithmetic processing accelerator is used to realize an order-adjustable filter, and different orders are used to correspond to different frequencies to realize the YCbCr space. It is a low-pass filter with adjustable order and edge judgment, which can effectively reduce the brightness and color noise of the image for different frequencies, and at the same time enhance the edge of the image through deformation operations.

[0037] Basically, the present invention divides the image into Y brightness and C saturation. Generally speaking, the change of chroma is not as strong as the change of luminance, that is to say, the spatial frequency of chroma is much lower than that of luminance. The present invention utilizes such image characteristics, applies different orders to brightness and chroma respectively, and proposes a low-pass filter that is more capable of judging obje...

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Abstract

The invention discloses a method for eliminating image noise and an image processing device. The method for eliminating the image noise comprises the following steps: receiving an image and performing a first stage processing on the image so as to acquire brightness information Y corresponding to a pixel array and color information Cb and / or Cr which are separated under a YCbCr coordinate space (domain); aiming at the brightness information Y, performing a second stage processing so as to at least reduce brightness noise; aiming at the color information Cb and / or Cr, performing a third stage processing so as to at least reduce color noise; and combining the brightness information Y with the color information Cb and / or Cr.

Description

technical field [0001] The present invention relates to an image processing technology, in particular to an image compression technology for separately filtering brightness information Y and a color information Cb and / or Cr. Background technique [0002] Image processing technology, for example, requires a more efficient processing mechanism with the development of digital cameras in recent years. Generally, consumers need to shoot color photos in digital cameras at low brightness in order to have anti-shake requirements, which also makes the requirements for high-sensitivity (High ISO) noise-cancelling functions increasingly high. Generally speaking, the lower the sensitivity, the smaller the noise. The higher the sensitivity, the greater the noise. How to suppress image noise due to high sensitivity is a subject. Among them, the noise part, especially the color noise, is more unacceptable. [0003] Generally speaking, to process a photo of a digital camera, a digital i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/21
Inventor 江铭峰
Owner NOVATEK MICROELECTRONICS CORP
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