Method for preprocessing noise reduction and block effect removal in low bit-rate video application

A technology of video application and deblocking effect, which is applied to the components of color TV, the components of TV system, and the modification of digital video signals. Problems affecting the visual effect of reconstructed images

Inactive Publication Date: 2009-10-28
NANTONG UNIVERSITY
View PDF0 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The noise contained in the source image input to the compression coding system not only affects the subjective and objective quality of the image, the accuracy of motion search during coding, but also leads to the increase of DCT high-frequency coefficients and reduces the coding efficiency, etc.
The filtering scheme based on no motion compensation will cause temporal distortion in the motion area of ​​the video
In addition, due to the low bit-rate application of block-based video coding, when the quantization step size of adjacent blocks differs greatly, distortions such as block effect, mosquito noise (ring effect) and base image penetration effect will inevitably appear in the reconstructed image. Phenomenon, which seriously affects the visual effect of the

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preprocessing noise reduction and block effect removal in low bit-rate video application
  • Method for preprocessing noise reduction and block effect removal in low bit-rate video application
  • Method for preprocessing noise reduction and block effect removal in low bit-rate video application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0037] A preprocessing method for noise reduction and deblocking in low-bit-rate video applications, comprising the following steps:

[0038] (1) Use the eigenvalues ​​of the matrix to perform gradient analysis, use the gradient analysis module to perform edge detection, and then perform an erosion operation on the gradient map corresponding to the original image to eliminate the gradient points caused by isolated noise, and perform an expansion operation to remove The edges corresponding to the gradient points are connected;

[0039] (2) adopt motion detection module to do motion detection to estimate the motion area of ​​image;

[0040] (3) Using the filter strength judgment module, according to the code rate, gradient and motion characteristics, select a bilateral filter with appropriate strength for filtering. The two parameters of the bilateral filter are gray level difference information and distance information.

[0041] The specific functions of each module are:

[0...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for preprocessing noise reduction and block effect removal in low bit-rate video application. The method comprises the following steps: analyzing gradient by matrix eigenvalue; carrying out edge detection by a gradient analysis module; carrying out corrosion operation on a gradient map corresponding to an initial image to eliminate a gradient point generated by single noise; carrying out expansive operation to connect edges corresponding to the gradient point; performing motion detection by adopting a motion detection module to evaluate the motion area of the image; and selecting a two-sided filter with proper strength for filtration by adopting a filter strength determine module according to the code rate, gradient and motion characteristic. Two parameters of the two-sided filter are grey difference information and distance information. The method not only reduces noise, filters unimportant details for high efficient compression, avoids generation of the block effect, but also can play the effect of code rate control in certain degree.

Description

Technical field: [0001] The invention relates to a method for preprocessing and removing block effects in low code rate video applications. Background technique: [0002] The noise contained in the source image input to the compression coding system not only affects the subjective and objective quality of the image, the accuracy of motion search during coding, but also leads to the increase of DCT high-frequency coefficients and reduces the coding efficiency. However, based on the filtering scheme without motion compensation, it will cause time-domain distortion in the motion area of ​​the video. In addition, due to the low bit-rate application of block-based video coding, when the quantization step size of adjacent blocks differs greatly, distortions such as block effect, mosquito noise (ring effect) and base image penetration effect will inevitably appear in the reconstructed image. The phenomenon seriously affects the visual effect of the reconstructed image (especially ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H04N5/14H04N5/21H04N7/26H04N19/117H04N19/80
Inventor 谢正光包志华徐晨章国安
Owner NANTONG UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap