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Rapid depth map coding mode selection method based on JNDD (Just Noticeable Depth Difference) model

A depth map coding and mode selection technology, applied in the field of depth map coding, can solve the problems of slight drawing distortion, not easy to be noticed, annoying drawing distortion, etc., and achieve the effect of reducing coding complexity

Active Publication Date: 2012-11-28
SHANGHAI UNIV
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  • Claims
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AI Technical Summary

Problems solved by technology

Drawing artifacts introduced by encoding artifacts in edge regions are annoying and easily noticeable in synthetic views
In flat areas, however, the rendering artifacts caused by depth encoding are usually slight and imperceptible

Method used

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  • Rapid depth map coding mode selection method based on JNDD (Just Noticeable Depth Difference) model
  • Rapid depth map coding mode selection method based on JNDD (Just Noticeable Depth Difference) model
  • Rapid depth map coding mode selection method based on JNDD (Just Noticeable Depth Difference) model

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Embodiment Construction

[0022] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but the scope of protection of the present invention is not limited to the following embodiments.

[0023] The application environment of the embodiment of the present invention is as follows: the video used for depth coding and depth-based rendering is the "Leave_Laptop" standard test sequence, and the resolution of this sequence is 1024×768; figure 2 A colored texture image for the test sequence "Leave_Laptop"; image 3 for figure 2 The depth map corresponding to the color texture image shown; the decoder uses the reference software JM of H.264 / AVC standard; the frame rate of the encoder is 30, and the number of reference frames is 2 frames.

[0024] see figure 1 , the fast depth map encoding method based on JNDD model of the present invention, its steps are:

[0025] (1) Edge detection of coded macroblocks: edge detection is performed ...

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Abstract

The invention relates to a rapid depth map coding mode selection method based on an JNDD (Just Noticeable Depth Difference) model, and the method comprises the following steps of: carrying out edge detection on a coding macro-block to obtain an edge value of the current block; determining a threshold value which cannot be preceived by human eyes of a depth difference in different depth value regions in the macro-block by utilizing a minimum perceptible depth difference model, comparing the threshold value with the edge value, and dividing a depth map into a vertical edge region and a flat region; and adopting a full search strategy on the edge region, and adopting SKIP (Simple Key Internet Protocol) mode search, interframe 16*16 mode search and intraframe mode search on the flat region. By utilizing the rapid depth map coding mode selection method, according to the characteristics of depth data and influences of depth coding distortion on the drawing visual quality, on the premise of ensuring the virtual visual quality and the coding rate to be basically invariable, the coding complexity can be greatly lowered, and the coding speed of a depth map coding module in a three-dimensional video system is increased.

Description

technical field [0001] The present invention relates to a depth map coding technology in 3D video coding, in particular to a coding mode selection method based on a Just Noticeable Depth Difference (JNDD) model that reduces the complexity of depth map coding. Background technique [0002] The depth-enhanced three-dimensional video (Three-Dimensional Video, 3DV) structure is composed of color video and its corresponding depth map. The expression method of FVV). In MVV and FVV application devices, the depth image based rendering technology (Depth Image Based Rendering, DIBR) uses the geometric information contained in the depth image to synthesize a high-quality virtual viewpoint, which has the characteristics of easy compression, good compatibility, and support for interactivity. . In order to meet the requirements of data storage and network transmission, depth maps are usually represented by grayscale image sequences, and can be encoded by video coding technologies such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N13/00H04N7/26H04N19/176H04N19/55
Inventor 邬芙琼安平郑专张秋闻张兆杨
Owner SHANGHAI UNIV
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