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Panoramic video dual loop belt sampling method and device

A panoramic video and ring-band technology, applied in the field of video coding, can solve the problems of sampling structure redundancy, sampling redundancy, uneven distribution, etc., and achieve the effect of reducing sampling structure redundancy, improving compression efficiency, and reducing the number of sampling points.

Inactive Publication Date: 2017-05-31
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] In summary, the main disadvantage of the existing panoramic video sampling methods is that there is a large redundancy in the sampling structure.
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.
On the other hand, the existing panoramic video sampling methods are not fully compatible with panoramic video content. Pyramid sampling only supports panoramic video applications with the main viewpoint, and in some application scenarios, it is not necessary to store a complete spherical video. Only a 360-degree ring or half a sphere can be reserved. It is difficult for existing panoramic video sampling methods to sample an incomplete sphere through simple operations.

Method used

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  • Panoramic video dual loop belt sampling method and device
  • Panoramic video dual loop belt sampling method and device
  • Panoramic video dual loop belt sampling method and device

Examples

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Embodiment 1

[0063] Such as Figure 9 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=1252 and M=2304, and the requirements for quantization accuracy are also the same for each component, all of which are quantized to 256 levels. Then for each component, repeat steps 1 to 6 as follows:

[0064] Step 1, record the 30 degree north latitude line as O N , record the 30° south latitude line as O S , O N and O S Divide the spherical surface into one annular surface and two spherical caps, and record them as "top", "horizontal ring" and "bottom" in order from north to south.

[00...

Embodiment 2

[0073] Such as Figure 9 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 spatial definition requirements are N=1152 and M=2304 for the Y component, and N=576 and M=1152 for the Cb and Cr components, and the quantization accuracy requirements are the same for each component, and they are all quantized to 256 levels.

[0074] For the Y component, the following steps are performed:

[0075] Step 1, record the 30 degree north latitude line as O N , record the 30° south latitude line as O S , O N and O S Divide the spherical surface into one annular surface and two spherical caps, and record them as "top", "horizontal ring" ...

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Abstract

The invention discloses a panoramic video dual loop belt sampling method and device. The method comprises the following steps: using northern latitude W degree line andsouthern latitude W degree line to divide a spherical surface into 1 annular curved surface and two spherical crowns; making 2 circles using several points on the spherical surface, and separating the spherical surface to obtains six parts; using a circle consisting of the east longitude 90 degree meridian and the west longitude 90 degree meridian to separate remaining parts that are unmarked on the spherical surface to obtain eight parts, so far, dividing the spherical surface into 14 blocks; calculating to obtain a light value in each region on the spherical surface, and obtaining a sampling value of each sampling point in the region by an interpolation method. By means of using the method disclosed by the invention, redundancy of the sampling structure can be reduced, so that, under the condition of achieving the same spatial clarity, the number of the sampling points is small, and an amount of data after sampling is small. Meanwhile, the method and the device disclosed by the invention facilitate to reserve an adjacent relationship, and may effectively improve the compression efficiency for follow-up prediction codes.

Description

technical field [0001] The invention relates to video coding technology, in particular to a method and device for panoramic video double-loop sampling. 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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IPC IPC(8): H04N19/132H04N19/42
CPCH04N19/132H04N19/42
Inventor 赵海武李国平滕国伟王国中
Owner SHANGHAI GMT DIGITAL TECH
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