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Double C-shaped panoramic video projection method in spherical equatorial area

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

Active Publication Date: 2021-06-04
FUDAN UNIV
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  • Abstract
  • Description
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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-shaped panoramic video projection method in spherical equatorial area
  • Double C-shaped panoramic video projection method in spherical equatorial area
  • Double C-shaped panoramic video projection method in spherical equatorial area

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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 invention proposes a novel projection method for spherical panoramic video, which improves the problems of distortion and pixel redundancy in the panoramic video image of 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 in the...

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Abstract

The invention belongs to the technical field of digital video, in particular to a double C-shaped panoramic video projection method in a spherical equator region. The present invention uses two strips whose normal directions are perpendicular to each other to realize the wrapping of the spherical surface, and performs equidistant cylindrical projection in the two strips to realize the mutual conversion between the spherical surface and the plane, which is called "spherical double C type". projection". The method of the invention has good symmetry, and the picture projected on the plane by using the method is closer to the common vision of human eyes. This projection method can save 25% of the planar image area while maintaining the same spherical pixel information as ERP.

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 Patents(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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