Free view-point image quality evaluation method based on light space

A viewpoint image and quality evaluation technology, applied in image communication, television, electrical components, etc., can solve the problems of no universally used results and less research

Inactive Publication Date: 2009-07-08
SHANGHAI UNIV
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Problems solved by technology

[0004] So far, there are few studies on image quality evaluation based

Method used

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  • Free view-point image quality evaluation method based on light space
  • Free view-point image quality evaluation method based on light space
  • Free view-point image quality evaluation method based on light space

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Experimental program
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Embodiment Construction

[0068] One implementation of the invention is as follows.

[0069] The test data of the present invention is: the original ray space of xmas sequence, the ray space obtained by fixed direction interpolation of xmas and rena sequence, the ray space obtained by bilinear interpolation of xmas and rena sequence, the ray space obtained by nearest neighbor interpolation of xmas and rena sequence , and the viewpoint images generated from these interpolated ray spaces.

[0070] see figure 1 , this free viewpoint quality evaluation method based on ray space can evaluate the quality of ray space through the direction and angle consistency parameters of straight line edge pixels with the same ray space direction in the case of passive reference images. High-quality ray spaces produce high-quality viewpoint images, so this method can measure the quality of viewpoint-free images produced by different ray spaces.

[0071] The steps are:

[0072] (1) Obtain the high-frequency energy map o...

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Abstract

The present invention relates to a free viewpoint image quality evaluation method based on ray space. The invention uses the edge pixel direction consistency parameter of lines which have same direction in ray space for elevating the ray space quality obtained by three different interpolation methods. Firstly the high-frequency energy diagrams of all pixel direction angles in the ray space are obtained from three interpolation methods. Simultaneously the edge graph of ray space, which has low noise and same direction, is obtained. Then the average high frequency energy value of pixel direction angle in the edge graph is calculated, and the value is used as an important criterion which is used for evaluating the consistency of ray space edge pixel direction obtained through interpolation. Finally whether the evaluated high-quality ray space can generate high-quality viewpoint picture is checked. The test shows that when the ray space obtained through fixed-direction interpolation, ray space obtained through bilinear interpolation and ray space obtained through most adjacent interpolation are executed with quality evaluation, the obtained parameter variation is more uniform and is more adjacent with the variation characteristic of PSNR evaluation result compared with the prior art.

Description

technical field [0001] The invention relates to a passive quality evaluation method, in particular to a free viewpoint image quality evaluation method based on light space. Background technique [0002] Free viewpoint video is a new visual technology gradually developed at the beginning of this century. Free viewpoint video is a kind of multi-dimensional video image with extremely high performance (stereoscopic and viewing angle optional) that can be generated by processing two-dimensional video images obtained by camera arrays. The representation method of , has broad application prospects in the fields of 3D TV, free-viewpoint TV, immersive 3D video conferencing, 3D video surveillance, 3D virtual reality, and exhibition technology. Among the various applications of free-viewpoint video, the most essential content is to experience the real 3D world directly from the display device. This is mainly achieved by recording 3D scene data, effectively representing these data, and...

Claims

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Application Information

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IPC IPC(8): H04N17/00
Inventor 周利安平张兆杨刘苏醒
Owner SHANGHAI UNIV
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