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Spherical image compression method based on spherical wavelet transform

An image compression and wavelet transform technology, applied in the field of computer vision, can solve problems such as compression efficiency of spherical images, and achieve efficient compression

Pending Publication Date: 2022-05-06
BEIJING UNIV OF TECH
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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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  • Spherical image compression method based on spherical wavelet transform
  • Spherical image compression method based on spherical wavelet transform
  • Spherical image compression method based on spherical wavelet transform

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Embodiment Construction

[0044] In order to present the technical content of the present invention more clearly, the specific implementation methods and experimental comparison effects of the present invention will be introduced in detail below.

[0045] The spherical image compression method based on the spherical wavelet transform proposed by the present invention can realize high-efficiency compression of the spherical image. The frame process of the present invention is as attached figure 1 Shown, including spherical wavelet transform and S-SPIHT codec. The spherical wavelet transform module transforms the input spherical image to generate spherical wavelet coefficients. The spherical wavelet coefficients are composed of different high and low frequency subbands. Scanning is an important part of the S-SPIHT codec. There are three scanning methods in the scanning part to scan the spherical wavelet coefficients of each subband. The wavelet coefficients are then encoded using a spherical SPIHT enco...

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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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N13/161H04N19/124H04N19/129H04N19/182H04N19/46H04N19/63G06T9/00
CPCH04N13/161H04N19/63H04N19/46H04N19/124H04N19/129H04N19/182G06T9/007G06T9/008
Inventor 施云惠王欢王瑾吴刚尹宝才
Owner BEIJING UNIV OF TECH
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