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A method and apparatus for mapping between a sphere and a plane

An inter-plane, plane video technology, applied in the field of video coding, can solve the problem of consuming storage and network transmission bandwidth, and achieve the effect of reducing the bit rate, processing time, and data content range

Inactive Publication Date: 2018-12-28
SUPERD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is that after being projected onto the plane in the Equirectangular algorithm, the area of ​​the plane rectangle is enlarged by π / 2 times, which will lead to maintaining the same compression quality, which needs to be guaranteed by a corresponding code rate increase. The problem of consuming more storage and network transmission bandwidth

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  • A method and apparatus for mapping between a sphere and a plane
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  • A method and apparatus for mapping between a sphere and a plane

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Embodiment 1

[0076] Embodiment 1 of the present invention provides a method for mapping between a spherical surface and a plane. The collected spherical video frame data is converted into original plane video frame data by a preset method, wherein the original plane video frame data is in a rectangular format video frames; the collected spherical video frame data may be collected by multiple cameras, and the number and configuration of the cameras are in the prior art, and will not be repeated here. In the prior art, video encoding is directly performed on each original plane video frame data, but in the embodiment of the present invention, before video encoding is performed on each original plane video frame data, such as image 3 As shown, the following method steps are also performed:

[0077] In step 201, the original planar video frame is divided into n strip-shaped areas of equal length according to preset vertical intervals, wherein n is a natural number.

[0078] Such as Figure ...

Embodiment 2

[0105] In addition to providing a method corresponding to converting the existing spherical video frame into a planar rectangular video frame as described in Embodiment 1, and then further completing the transformation of the bar area change, the embodiment of the present invention also provides a method based on planar video The frame generates the method for spherical video frame, in the embodiment of the present invention, the pixel point in the plane rectangular video frame is called texel in the spherical video frame, and the graphics processed in the plane rectangular video frame (such as Figure 11 The triangle ABC shown) is called a texture in a spherical video frame (e.g. Figure 12 Triangle A'B'C' shown). Use the generated plane video frame (for example: Figure 7 Shown by the planar video frame obtained by mapping transformation), wherein, corresponding to each transformation bar area is stored with the boundary parameters of the corresponding transformation bar ar...

Embodiment 3

[0122] In addition to providing a method for mapping between a sphere and a plane as described in Embodiment 1, the embodiment of the present invention also provides a device for mapping between a sphere and a plane for performing the method described in Embodiment 1. method steps such as Figure 14 As shown, the device includes:

[0123] The original planar video frame data conversion module is used to convert the collected spherical video frame data into the original planar video frame data by a preset method; wherein, the original planar video frame data is a video frame in a rectangular format;

[0124] The planar video frame area division module is used to divide the original planar video frame into n equal-length strip areas according to the preset vertical interval, where n is a natural number;

[0125] The spherical video frame area division module divides the area between the north and south poles of the spherical video frame into n ring-shaped areas with the north a...

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Abstract

The invention relates to the technical field of video coding and provides a method and an apparatus for mapping between a sphere and a plane. The method further comprises the following steps: a plurality of right triangles separated from the transformed bar region are used as sources for obtaining corresponding pixel arrays from a spherical triangular texture pattern; a plurality of right triangles are separated from the transformed bar region; according to the boundary parameters of the transformed stripe region, pixels on each transformed stripe region are converted into the pixels constituting the spherical video frame according to the triangular texture pattern as the processing unit. The invention considers the simplified transformation processing, and avoids the problem of black edgeon the sphere caused by data loss due to invalid data area collected in the mapping process, which may be caused by re-generating the spherical video frame after decoding, and avoids the problem of black edge on the sphere caused by data loss.

Description

【Technical field】 [0001] The present invention relates to the technical field of video coding, in particular to a method and device for mapping between a spherical surface and a plane. 【Background technique】 [0002] In 360-degree panoramic video applications (such as immersive VR), the photographer will use multiple cameras to capture all angles of 360 degrees horizontally and 180 degrees up and down, and then use a video synthesis device to synthesize the video into a panoramic video, that is, a spherical video. [0003] But spherical video data is not easy to represent, store and compress. Currently in the field of video compression, various existing compression standards such as H.264, H.265, etc. are all for compressing flat rectangular areas. In order to compress and transmit video data using existing video compression standards, it is common practice to project spherical video onto a plane. [0004] At present, the methods commonly used in the market include cylind...

Claims

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Application Information

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IPC IPC(8): H04N19/182H04N19/42G06T3/00
CPCH04N19/182H04N19/42G06T3/08
Inventor 田志泽李亚鹏简培云
Owner SUPERD CO LTD