Planar projection method and coding method of 360-degree panoramic video

Abstract

The invention discloses a planar projection method and a coding method of a 360-degree panoramic video. Active region area of a plane figure formed by projecting a spherical surface to a plane is just equal to area of spherical surface, thus, area of an object can be guaranteed to be constant and be stretched or resized never; and according to the corresponding coding method of the 360-degree panoramic video, almost 40% of blank region is processed by a skipped macroblock mode, only limited bit needs to be coded, little data is consumed, proportion in a whole frame is very low, and it can be considered that only the active region consumes data, thus, coding for almost 40% of figure area is saved, and corresponding code rate is saved.

Description

technical field [0001] The present invention relates to a plane projection method of 360-degree panoramic video, and also relates to a coding method of 360-degree panoramic video. 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 cylindrical p...

AI Technical Summary

Problems solved by technology

However, after this method is projected to the plane, the area of ​​the plane rectangle is enlarged by π / 2 times, which will result in maintaining the same compression quality, which requires a corresponding bit rate increase to ensure that it consumes more storage and network transmission. bandwidth

[0005] In addition, there is a more common cubic projection method, which is to project the spherical surface onto the six faces of the embedded cube of the ball, so that the projected plane area is smaller than that of the spherical surface, but its disadvantage is that the unit area on the spherical surface is projected onto the plane The area on , which varies by location—especially the cube edges—causes the scaling to be more pronounced, which can lead to loss of original image information and final display distortion

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