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Method for reducing compressed image encoding noise

A technology for compressing images and noise, which is applied in the field of reducing the coding noise of compressed images and can solve problems such as affecting video quality.

Inactive Publication Date: 2012-07-25
SYSU HUADU IND SCI & TECH INST
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Problems solved by technology

Both effects will seriously affect the video quality, the higher the compression rate, the more obvious the image loss

Method used

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  • Method for reducing compressed image encoding noise
  • Method for reducing compressed image encoding noise

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Embodiment Construction

[0033] The present invention will be further elaborated below in conjunction with the accompanying drawings.

[0034] Such as figure 1 As shown, the basic idea of ​​the method for reducing compressed image coding noise of the present invention is:

[0035] In the first step, the invention detects a 3×3-based observation window. In order to obtain the Weber ratio, each pixel in the window is compared with the central pixel. In this way, the Weber ratio of 8 neighboring points in the window needs to be calculated at a time. According to the characteristics of the human visual system, when the Weber ratio of the pixel relative to the center point is less than the threshold value, the effect appears to be similar in brightness, and it is difficult for the human eye to distinguish the difference in brightness between two pixels; When similar, that is, the Weber ratio is less than the threshold value, mark the center pixel as 1 to indicate that the point has continuous brightness i...

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Abstract

The invention discloses a compressed image encoding noise filter device, which reduces Gibbs oscillation in an image boundary area after decoding recovery and discontinuity in a block boundary area due to loss of discrete cosine coefficient caused by quantization. A method for reducing compressed image encoding noise includes: according to pixel characteristics of images, dividing pixel belonging area of original images into a smooth area and a non-smooth area, wherein the non-smooth area is an area with large luminance variation in images and comprises a boundary area and a line area, the smooth area is an area with slow luminance variation in the images; performing smooth filter processing to the smooth area in the original image by a variable filters with directional strokes; telling fineness and noise of the original image by noise detection and detecting noise belonging to block effect in the original images; filtering and reducing noise belonging to the block effect in the images subjected to smooth filter process by the variable filters with directional strokes and different smoothness coefficient.

Description

technical field [0001] The present invention relates to a kind of technology that reduces the coding noise of compressed image, specifically, relate to a kind of loss of discrete cosine term (Discrete Cosine Transform, DCT) coefficient due to quantization, cause the Gibbs appearing in the border area of ​​image after decoding restores. Oscillating phenomena, and methods for reducing coding noise in compressed images for discontinuities occurring in block boundary regions. Background technique [0002] With the popularity of high-definition and high-quality LCD TVs, people's requirements for picture display quality are increasing day by day. The application of image compression technology effectively solves the problems of high-quality video sources occupying a large storage space and limiting transmission bandwidth, making high-definition, Communication of high-quality video is possible. At present, compression technology has been widely used in static image and dynamic ima...

Claims

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Application Information

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IPC IPC(8): H04N5/21H04N7/26H04N19/625
Inventor 陆许明谭洪舟徐永键孙旭
Owner SYSU HUADU IND SCI & TECH INST
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