Spherical image compression method based on spherical wavelet transform

Abstract

In order to solve the problem of spherical image compression efficiency, the invention provides a spherical image compression method based on spherical wavelet transform, which comprises the following steps of: indexing a spherical triangular pixel by using the existing spherical image representation SMSIR based on spherical measurement, transforming the spherical triangular pixel by using the spherical wavelet transform based on the SMSIR, and compressing the spherical image by using the spherical wavelet transform based on the SMSIR. Spherical wavelet coefficients after transformation are scanned, coded and decoded by using an SMSIR image compression scheme S-SPIHT to complete spherical image compression, the S-SPIHT is an improvement on the SPIHT, the improvement lies in setting of pixel coordinates, that is, a spherical image is represented by using three-dimensional coordinates dk (pk, qk, mk), and the spherical image is compressed by using the three-dimensional coordinates dk (pk, qk, mk). In addition, the improvement also can be that the setting of pixel coordinates is changed and the scanning sequence of the SPIHT is redesigned at the same time, and specifically comprises ordered root tree index scanning ORTIS, binary index line-by-line scanning DIPS and binary index cross scanning DICS.

Description

technical field [0001] The invention belongs to the field of computer vision, and specifically relates to image compression and encoding technology. Background technique [0002] In recent years, with the development of VR and AR technologies, 360° images / videos have gradually become popular and received widespread attention in extended reality such as game entertainment, education and medical fields. For an immersive visual experience, 360° images / videos require higher resolution. Therefore, improving the compression efficiency of 360° image / video is an urgent problem to be solved. For this reason, the present invention proposes a compression method for spherical images. [0003] Regarding spherical image compression, the existing technologies generally map spherical images to two-dimensional planes, such as representation methods such as equirectangular projection, cubic mapping projection, and octahedral projection format. However, these representations often lead to d...

AI Technical Summary

Problems solved by technology

[0006] In view of this, in order to solve the problem of spherical image compression efficiency, the present invention proposes a spherical image compression method based on spherical wavelet transform

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