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A block size computing method and transmission method for cylinder panorama video code

A cylindrical panorama and video encoding technology, which is applied in the field of video and image encoding and decoding, can solve the problems of increasing the amount of transmitted data and not considering the block size, etc., and achieve the effect of small amount of data and high compression efficiency

Active Publication Date: 2008-02-20
INST OF COMPUTING TECHNOLOGY - CHINESE ACAD OF SCI
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Problems solved by technology

However, in some systems at home and abroad, the size of the block is basically not considered. The block size is generally determined according to experience, which leads to an increase in the amount of transmitted data.

Method used

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  • A block size computing method and transmission method for cylinder panorama video code
  • A block size computing method and transmission method for cylinder panorama video code
  • A block size computing method and transmission method for cylinder panorama video code

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Embodiment Construction

[0023] Partial view visual quality is determined by the panoramic video raw encoding quality. During the coding process, quantization parameters (QP) are used to control the quality of panoramic video coding. It is necessary to calculate the block size a to minimize the amount of transmitted data under certain QP conditions, even if the transmission code rate r a The smallest chunk size a. So first calculate the transmission code rate r a Functional relationship with block size a.

[0024] Assume that the width of the target area is M macroblocks, and the block size is a macroblocks, as shown in FIG. 1 . Because the position where the target area falls in the panoramic video will change, the number of related blocks will also change accordingly. One case is that the right boundary of the target area is in the range of a', and the number of related blocks is N'; the other case is that the right border of the target area is in the range of a", and the number of related block...

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Abstract

The utility model provides a calculation method of block size of cylindrical panoramic video coding and a transmission method, which is characterized in that: a code rate of the panoramic video coding is got without direct blocking pre-coding to the cylindrical panoramic video; blocking pre-coding to the video is operated according to an optional block size, and the code rate in the block size is got; the increment of the two code rate is computed; the impact factor of the video is computed based on the increment; and the optimal coding block size is computed based on the impact factor. The utility model also provides a transmission method of the cylindrical panoramic video block coding based on the block size computed by the calculation method. The utility model has the advantages of computing the optimal coding block size by twice pre-coding, and having lowest transmission data size in the same visual quality of users by using the optimal block size to code the cylindrical panoramic video.

Description

technical field [0001] The invention relates to the field of video and image coding and decoding, in particular to a block size calculation method of cylindrical panoramic video coding and a transmission technology of cylindrical panoramic video coding based on blocks. Background technique [0002] Panoramic video is an emerging media. Compared with traditional video, it has the characteristics of large field of view, high resolution, and large amount of data. With the panoramic video, the viewer's point of view remains unchanged, and the entire surrounding scene can be observed by changing the observation direction, while the ordinary two-dimensional video only reflects a certain part of the panoramic video. [0003] Cylindrical panoramic video is a common panoramic video, which is equivalent to a virtual camera that projects three-dimensional objects in space onto a cylindrical surface. Cylindrical panoramic video can be generated by using a multi-camera or single-camera ...

Claims

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Application Information

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IPC IPC(8): H04N7/26G03B37/00H04N19/124H04N19/146H04N19/176
Inventor 代锋张勇东张冬明
Owner INST OF COMPUTING TECHNOLOGY - CHINESE ACAD OF SCI
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