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Video denoising system based on noise distribution feature detection

A technology of noise distribution and feature detection, applied in the field of video processing, can solve the problems of "speckle" noise and moving object smearing, and achieve the effect of good denoising effect

Active Publication Date: 2015-07-22
北京集朗半导体科技有限公司
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Problems solved by technology

[0008] In order to solve the distortion problems such as "spot" noise and moving target smearing when performing time-domain denoising on videos whose noise characteristics do not satisfy independent and identi

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  • Video denoising system based on noise distribution feature detection
  • Video denoising system based on noise distribution feature detection

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[0033] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following will first analyze the causes of distortion and video noise distribution characteristics in conjunction with specific embodiments and with reference to the drawings, and then further describe the embodiments of the present invention in detail.

[0034] 1. Analysis of the causes of distortion and video noise distribution characteristics

[0035] (1) Analysis of the causes of distortion

[0036] Such as figure 1 The motion detection unit in the video time-domain denoising system shown below compares the local inter-frame difference of each pixel with a threshold to obtain the motion probability of the pixel. No matter how the threshold is selected, two errors will occur, one The error is that static pixels are mistakenly classified as moving pixels, and one error is that moving pixels are mistakenly classified as static pixels. Misclassification of stationary pix...

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Abstract

The invention discloses a video denoising system based on noise distribution feature detection. On the basis of a time domain denoising system composed of a frame memory, an interframe difference calculation unit, a motion detection unit, a filtering weight calculation unit and a time domain filtering unit, a noise distribution independence feature detection unit, a noise distribution synchronism feature detection unit, a combination judgment unit and a filtering weight maximum value adjusting unit are provided additionally. The reliability of independent and identical distribution of noise is calculated, a weight maximum value of time domain filtering is adjusted according to the reliability, and accordingly, filtering distortion is controlled. By the video denoising system, the distortion problem caused by conventional video time domain denoising systems when video noise cannot meet independent and identical distribution is solved.

Description

technical field [0001] The present invention relates to the technical field of video processing, in particular to the technical field of time-domain noise reduction for video, such as the technical field of video processing in digital television chips. Background technique [0002] Since the camera equipment (CMOS, CCD sensor) is often affected by noise during the acquisition process, resulting in random noise in the video, it is necessary to use video denoising technology to remove the noise. In addition, with the mobile Internet and more and more sources of video, various video sources need to be played and displayed on display terminal devices such as TVs. These video sources include not only traditional digital broadcast videos, but also videos from the Internet and handheld interrupts. . The multi-source of video poses new challenges to the video denoising system. [0003] Video noise reduction technology includes spatial noise reduction and temporal noise reduction t...

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Application Information

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IPC IPC(8): H04N5/21H04N5/14
Inventor 郭若杉罗杨韩睿韩松
Owner 北京集朗半导体科技有限公司
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