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Method and apparatus for mapping virtual-reality image to a segmented sphere projection format

A technology of spherical projection and virtual reality, applied in 3D image processing, image rendering, image communication, etc., can solve problems such as not optimal mapping, codec performance impact, etc.

Active Publication Date: 2019-12-13
MEDIATEK INC
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Problems solved by technology

However, the mapping for the North Pole image as well as the South Pole image for SSP may not be optimal, there may be other mappings that lead to better performance
Moreover, there are some redundant areas (i.e., blank areas) around the circular area, which may have a negative impact on the codec performance

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  • Method and apparatus for mapping virtual-reality image to a segmented sphere projection format
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  • Method and apparatus for mapping virtual-reality image to a segmented sphere projection format

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Embodiment Construction

[0066] The ensuing description is the best mode for carrying out the present invention, and the descriptions are made to illustrate the basic principle of the present invention and should not be interpreted as limiting. The scope of the invention is best determined by reference to the appended claims.

[0067] Segmented Spherical Projection (SSP)

[0068] In the present invention, various technical fields for improving codec efficiency are related to SSP, and disclose a projection method including mapping the north and south poles of a sphere into a circular area, the layout of two pole images, and rectangular segmentation, and the A projection method that maps a circular area to a square area.

[0069] Projection method for mapping the North Pole and South Pole into a circular area

[0070]As mentioned before, in JVET-E0025, the North Pole image is generated according to the upper part of Equation (1) and the South Pole image is generated according to the lower part of Equa...

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Abstract

Methods and apparatus of processing spherical images related to segmented sphere projection (SSP) are disclosed. According to one method, a North Pole region of the spherical image is projected to a first circular image and a South Pole region of the spherical image is projected to a second circular image using a mapping process selected from a mapping group comprising equal-area mapping, non-uniform mapping and cubemap mapping. Methods and apparatus of processing spherical images related to rotated sphere projection (RSP) are also disclosed. According to this method, the spherical image is projected into a first part of rotated sphere projection corresponding to a region of the spherical image and a second part of rotated sphere projection corresponding to a remaining part of the spherical image using equal-area mapping.

Description

[0001] Related references [0002] This application claims priority to U.S. Provisional Patent Application No. 62 / 490,647, filed April 27, 2017, which is incorporated by reference in its entirety. technical field [0003] The present invention relates to 360° virtual reality images, in particular, the present invention relates to mapping 360° virtual reality images into segmented spherical projection (segmented sphere projection, referred to as SSP) format, rotated spherical projection (rotatedsphere projection, referred to as RSP) format or modified The cube map projection (cubemap projection, referred to as CMP) format. Background technique [0004] 360° video, also known as immersive video (immersive video), is an emerging technology that can provide a "live-like experience". The immersive experience can be realized by surrounding the user with a surround-type scene covering a panoramic view (panoramic view). Specifically, the panoramic view can be a 360° field of view. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T3/00G06T15/10H04N5/232
CPCG06T15/10G06T2215/08G06T3/0043H04N23/698G06T3/005
Inventor 李亚璇林建良张胜凯
Owner MEDIATEK INC
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