Method for utilizing 3D (three dimensional) dictionary to eliminate block effect in 3D display system

Abstract

The invention discloses a method for utilizing a 3D (three dimensional) dictionary to eliminate the block effect, mainly solving the problem of the block effect in existing 3D display system based on DIBR (depth image-based rendering) after block discrete cosine transform compression. The method comprises the following implementing steps of: (1) utilizing a KSVD (k-singular value decomposition) algorithm and batch-processing orthogonal matching pursuit algorithm to train a 3D dictionary; (2) controlling a quality factor in the JPEG (Joint Photographic Experts Group) standard to compress an original 3D image; (3) taking the block effect as Gaussian white noise and calculating the noise standard difference of the 3D compressed image; (4) calculating an error threshold according to the quality factor and the noise standard difference; (5) eliminating the block effect in the compressed image and acquiring a sparse coefficient representation matrix with elimination of the block effect; and (6) utilizing the 3D dictionary and the sparse coefficient representation matrix with elimination of the block effect to obtain a 3D result diagram with elimination of the block effect. Compared with the prior art, the method has the advantages that higher or similar peak signal and noise ratio and structural similarity can be obtained, and the visual effect of the image with elimination of the block effect is better.

Description

technical field [0001] The invention belongs to the field of image processing, specifically a method for eliminating block effects by using a 3D dictionary, which can be used to eliminate block effects in 3D images compressed by block discrete cosine transform BDCT in a 3D playback system based on depth image rendering DIBR . Background technique [0002] According to recent advances in multimedia processing technology, 3D TV is expected to be a new broadcasting method that can provide viewers with a more natural and lifelike home entertainment experience. In order to realize realistic 3D service in 3D TV, DIBR based depth image rendering is a necessary technology. DIBR technology was proposed for the first time in the advanced 3D TV system technology ATTEST project. It is a process of generating virtual left and right views in real scenes, which can provide 3D effects from reference image sequences and corresponding depth image sequences. The reference image and depth ima...

AI Technical Summary

Problems solved by technology

In the POCS-based method, the image prior is represented as a convex set, and the block effect is reduced through an iterative process. This method can reduce the block effect very well because the smoothness constraint is imposed at the block boundary. The disadvantage is that the calculation is complicated. High degree, long operation time

The MAP-based method can effectively reduce the block effect, but the computational complexity is high

Images