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An Adaptive QP Adjustment Method for Coding Cube Projection Format

An adjustment method and a cube technology, which are applied in the field of computer encoding and decoding, can solve the problem that the video encoding and decoding scheme cannot be effectively adapted, and achieve the effect of saving the code rate and improving the encoding efficiency.

Active Publication Date: 2022-03-22
BEIJING UNIV OF TECH
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Problems solved by technology

For this feature, traditional video codec schemes cannot be effectively adapted

Method used

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  • An Adaptive QP Adjustment Method for Coding Cube Projection Format
  • An Adaptive QP Adjustment Method for Coding Cube Projection Format
  • An Adaptive QP Adjustment Method for Coding Cube Projection Format

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specific Embodiment approach

[0018] The implementation of the present invention can be implemented under the current international standard encoding framework, such as H.265 / HEVC, H.266 / VVC and other frameworks. For the cube projection format of 360 ° panoramic video, targeted QP adjustment is carried out during the encoding process, and the specific implementation method is as follows:

[0019] 1: Set the coordinates of the lower left corner as the origin. For the frame to be encoded, start from the first CTU to obtain the position of the center pixel as a reference position. Determine the area where the reference position is located.

[0020] 2: Carry out different QP adjustment schemes according to the region. like figure 2 As shown, set the basic setting QP to QP 0 , for area 3, the pixel density is insufficient, but the pixel density is greater the farther away from the center of each circle, according to this feature, let the QP of area 3 be QP 3 :

[0021] QP 3 =QP 0 -3log 2 (2-X 3 ) (1)...

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Abstract

The invention relates to an adaptive QP adjustment method for encoding cube projection format, which belongs to the field of computer encoding and decoding. Based on the traditional encoding and decoding technology, the present invention makes targeted improvements aiming at the pixel distribution characteristics of the cube projection. Through adaptive QP adjustment, suitable solutions are adopted for different regions in the same frame to realize the optimization of the cube projection format. Compared with the traditional coding method unified QP, it can be more adapted to the cube projection format, which not only improves the coding efficiency but also saves the bit rate.

Description

technical field [0001] The method is a method for cube projection (CMP) format in 360° panorama video, and belongs to the field of computer codec. Background technique [0002] 360° panoramic video, also known as immersive video, can change the observation direction at the same position, and can browse all the surrounding scenes. It has been widely used in landscape display, digital entertainment, video conferencing, telemedicine and consultation, remote monitoring, robot automatic navigation, military confrontation simulation and virtual battlefield. [0003] The application of 360° panoramic video mainly includes acquisition, splicing, encoding, transmission and playback. 360° panoramic video capture requires multiple cameras to complete at the same time. After synchronous capture is completed, the videos captured by multiple cameras need to be spliced. Since the images taken at different angles are not on the same projection plane, direct seamless splicing of overlappin...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/593H04N19/124H04N19/182H04N13/122
CPCH04N19/593H04N19/124H04N19/182H04N13/122
Inventor 尹宝才李煜聪施云惠齐娜
Owner BEIJING UNIV OF TECH
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