Double-C-type panoramic video projection method for spherical equatorial region

An equatorial area, panoramic video technology, applied in the field of spherical double C-type projection, can solve the problems of image quality degradation and distorted pixels, and achieve the effect of overcoming distortion and pixel redundancy and saving storage space.

Active Publication Date: 2019-07-30
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose a new projection method that can overcome the distortion problem and the image quality degradation problem caused by pixel redundancy in the existing equidistant cylindrical projection (ERP) format panoramic video image

Method used

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  • Double-C-type panoramic video projection method for spherical equatorial region
  • Double-C-type panoramic video projection method for spherical equatorial region
  • Double-C-type panoramic video projection method for spherical equatorial region

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Embodiment Construction

[0021] The method of the present invention is further specifically described below by examples in conjunction with the accompanying drawings.

[0022] The present invention proposes a novel projection method for spherical panoramic video, which improves the problems of distortion and pixel redundancy in panoramic video images in the equidistant cylindrical projection (ERP) format.

[0023] The present invention is divided into two parts: the projection from the sphere to the plane and the projection from the plane to the sphere.

[0024] Projection from a sphere to a plane of size W*H, where for figure 1 The spherical coordinates described in (a), (u,v) are figure 1 The plane coordinates described in (b), The specific steps are:

[0025] First determine the position of the point on the sphere, and use the spherical coordinates to describe the position of the point, such as figure 1 shown. judge first Whether it falls in the range [-3π / 4, 3π / 4], whether θ falls i...

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Abstract

The invention belongs to the technical field of digital videos, and particularly relates to a double-C-type panoramic video projection method for a spherical equatorial region. According to the method, two strips with mutually perpendicular normal directions are used for wrapping the spherical surface, and equidistant columnar projection is carried out in the two strips respectively to realize mutual conversion between the spherical surface and a plane, which is called 'spherical surface double-C-shaped projection'. The method provided by the invention has good symmetry, and the picture projected onto the plane by using the method is closer to the common vision of human eyes. The projection mode can save 25% of planar image area under the condition that spherical pixel information which isthe same as that of the ERP is kept.

Description

technical field [0001] The invention belongs to the technical field of digital video, and in particular relates to a spherical double-C projection method. Background technique [0002] With the rapid development of electronic multimedia technology, people's demand for panoramic video is also becoming more and more vigorous. Whether watching movies, playing games or video conferencing, people are pursuing a more immersive experience. People can feel the atmosphere of the video more personally and get more information than traditional multimedia forms. As an important branch of virtual reality technology, panoramic video has received more and more attention in recent years. [0003] The difficulties restricting the popularization of panoramic video at this stage are mainly the uniformity of the spherical projection method and the limitation of transmission bandwidth. Since the panoramic video is generally acquired by multiple cameras in the range of 360 degrees in the horiz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N21/81H04N9/31H04N21/44
CPCH04N9/3179H04N21/44H04N21/816
Inventor 范益波孟子皓池俊曾晓洋
Owner FUDAN UNIV
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