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Apparatus of inter prediction for spherical images and cubic images

A cube and image sequence technology, applied in the field of image and video codec, can solve problems such as no border

Inactive Publication Date: 2018-08-31
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the two commonly used projection formats, spherical and cubic, can be set into rectangular frames, there are geometrically no boundaries in 360-degree frames

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  • Apparatus of inter prediction for spherical images and cubic images
  • Apparatus of inter prediction for spherical images and cubic images
  • Apparatus of inter prediction for spherical images and cubic images

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Embodiment Construction

[0038] The following description is a preferred mode of carrying out the present invention. The purpose of this description is to illustrate the general principles of the invention, not to limit it. The scope of protection of the present invention should be defined by the claims.

[0039] As before, conventional video codecs process spherical and cubic images from conventional cameras as regular frames. When inter prediction is applied, a reference block in a reference frame is identified and used as a temporal predictor for the current block. Typically, a preset search window of reference frames is searched to find the best matching block. The search window can cover areas outside the reference frame, especially the area currently close to the frame boundary. When the search area is outside the reference frame, motion estimation is not performed, or in order to apply motion estimation, pixel data outside the reference frame is artificially generated. In traditional video ...

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Abstract

Methods and apparatus of video encoding and decoding for a spherical image sequence and a cubic image sequence using circular Inter prediction are disclosed. For the spherical image sequence, the search window includes an area outside or crossing a vertical frame boundary of the reference frame for at least one block of the current spherical image to be encoded. Candidate reference blocks within the search window are determined, where if a given candidate reference block is outside or crossing one vertical frame boundary, the reference pixels are accessed circularly from the reference frame ina horizontal direction crossing the vertical frame boundary of the reference frame. For the cubic image sequence, circular edges of the cubic frame are determined. The search window includes an areaoutside or crossing a circular edge of the reference frame for at least one block of the current cubic frame to be encoded.

Description

[0001] priority statement [0002] This application claims the priority of U.S. Provisional Patent Application No. 62 / 281,815 filed on January 22, 2016 and U.S. Patent Application No. 15 / 399,813 filed on January 06, 2017. The aforementioned related application is incorporated herein by reference in its entirety. technical field [0003] The present invention relates to image and video codecs. In particular, the present invention relates to inter-prediction techniques for spherical images and cubic frames converted from spherical images. Background technique [0004] 360-degree video, also known as immersive video, is a promising technology that can provide "the feeling of being there". Immersion is achieved by surrounding the user with a surrounding scene covering a panoramic view, specifically a 360-degree field of view. The "sense of being there" can be further enhanced by cube image rendering. Therefore, panoramic video is being widely used in virtual reality (Virtua...

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Application Information

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IPC IPC(8): H04N19/51
CPCH04N19/597H04N19/56H04N19/563H04N19/577
Inventor 林鸿志张胜凯
Owner MEDIATEK INC