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A panoramic video diamond sampling method and device

A panorama video and diamond technology, applied in the field of video coding, can solve the problems of rectangles without complete adjacency, unfavorable video coding and compression, sampling redundancy, etc., to avoid sampling structure redundancy, improve coding and compression efficiency, and complete content. The effect of adjacency

Active Publication Date: 2019-08-23
SHANGHAI GMT DIGITAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • A panoramic video diamond sampling method and device
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  • A panoramic video diamond sampling method and device

Examples

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Embodiment 1

[0079] Such as Figure 6 Shown is one image of a panoramic video represented by a latitude and longitude map with a resolution of 4096×2048. In a specific embodiment of the present invention, the panoramic video is a color video with three components. Assuming that the color components used are RGB, RGB is still used to represent the color of each sampling point after sampling. Assume that the requirements for spatial resolution are the same for the three components, all of which are N=1024 and M=2048, and the requirements for quantization precision are also the same for each component, all of which are quantized to 256 levels. Then for each component, repeat steps 1 to 4 as follows:

[0080] In the first step, the spherical surface is divided into 1024=2*512 toroidal surfaces with equally spaced parallels. Record the obtained toroidal surface as O i , i=0,1,...,1023, viewed from the center of the sphere, O i Arranged in order from top to bottom;

[0081] In the second st...

Embodiment 2

[0093] Such as Figure 6 Shown is one image of a panoramic video represented by a latitude and longitude map with a resolution of 4096×2048. In a specific embodiment of the present invention, the panoramic video is a color video with three components. Assuming that the color component used is YCbCr, and the sampling ratio is 4:4:4, YCbCr is still used to represent the color of each sampling point after sampling. Assume that the requirement for spatial resolution is N=1024, 2N=2048 for the Y component, and N=512, 2N=1024 for the Cb and Cr components, and the quantization precision requirement is the same for each component, which is quantized to 256 levels.

[0094] For the Y component, the following steps are performed:

[0095] In the first step, the spherical surface is divided into 1024=2*512 toroidal surfaces with equally spaced parallels. Record the obtained toroidal surface as O i , i=0,1,...,1023, viewed from the center of the sphere, O i Arranged in order from top ...

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Abstract

The invention discloses a panoramic video diamond sampling method and device. The method comprises the following steps of dividing a spherical surface into N=2K ring curved surfaces by using equally spaced latitudes according to a spatial resolution requirement, and orderly marking the ring curved surfaces as Oi; evenly dividing the ring curved surfaces Oi into Ti=2N-2-4M areas by using equally spaced longitudes; calculating and obtaining an average value of light rays in each area on the spherical surface as sampling values of sampling points corresponding to the area; and arranging the sampling values into one NxN matrix. The panoramic video diamond sampling method provided by the invention can enable the sampling points to meet the characteristics that the sampling points are more near the equator and the sampling points are less at the two poles on the spherical surface; the distribution characteristic of the number of the sampling points has the property of diamond distribution on a longitude and latitude graph, so that it is called the diamond sampling. The sampling method avoids sampling structure redundancy, so that the number of the sampling points is reduced and the amount of data after sampling is reduced under the condition that the same spatial resolution is achieved.

Description

technical field [0001] The present invention relates to video coding technology, in particular to a panoramic video diamond 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 m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/132
CPCH04N19/132
Inventor 吴成家顾晓林畅赵海武李国平滕国伟王国中
Owner SHANGHAI GMT DIGITAL TECH
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