A panoramic video hexagonal sampling method and device

Abstract

The invention discloses a panoramic video hexagonal sampling method and apparatus. The method comprises the following steps: dividing a spherical surface into N=6 annular curved surfaces by using latitude lines with equal intervals, making the annular curved surfaces as Oi in sequence, i = 0, and 1 ,... N-1, observing from the angle of the centre of sphere, and arranging the Oi from top to bottom; uniformly dividing the annular curved surface Oi into Ti areas by using meridians with equal intervals; calculating an average value of light within each area on the spherical surface to serve as a sampling value of a sampling point corresponding to the area; and arranging the sampling values in a matrix. By adoption of the sampling method, the redundancy of the sampling structure is avoided, and under the condition of realizing the same spatial resolution, the number of the sampling points is reduced, and the data size after sampling is reduced.

Description

technical field [0001] The invention relates to video coding technology, in particular to a panoramic video hexagonal sampling method and device. Background technique [0002] Panoramic video refers to all the scenes around an observation point in space, which is composed of all the light that this observation point can receive. Panoramic video can be abstracted into a sphere centered on the observation point. [0003] When using a computer to process panoramic video, it is inevitable to perform discretized spatial sampling on the panoramic video. When discretizing the spatial sampling of the panoramic video, it is necessary to ensure a certain spatial sampling density to achieve the required definition. At the same time, it is also necessary to consider that the memory of the computer is not suitable for storing data of a spherical structure, and it is necessary to arrange the sampling points on the plane in a certain way. [0004] The existing spherical sampling method ...

AI Technical Summary

Problems solved by technology

In the third step, when arranging, the content is often not completely adjacent, which brings disadvantages to video encoding and compression.

The distribution of sampling points of hexahedron sampling on the spherical surface is also uneven, there is still a large redundancy, and the content of the rectangle does not have complete adjacency

[0010] To sum up, the main disadvantages of the existing panoramic video sampling methods are that there is a large redundancy in the sampling structure and the resulting rectangle does not have complete adjacency of content.

The uneven distribution of sampling points on the spherical surface will not only bring sampling redundancy, but also bring inconvenience to video quality evaluation, because the spherical area corresponding to the final sampling point is different, so the distortion of each sampling point has a great impact on video quality. The impact is also different. When calculating the quality loss of the panoramic video after some processing, such as compression and decompression, it must be considered that the importance of each sampling point is different.

The non-adjacency of rectangular video in content is also not conducive to the compression coding of video coding

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