Target bit allocation method, system and device for H.265 code rate control

Abstract

The invention discloses a target bit allocation method, system and device for H.265 code rate control. The method comprises the steps of: allocating the GOP target bit number; calculating the coded bit number of frame images in a GOP; according to the coded bit number of the frame images and the GOP target bit number, calculating the bit allocation weight of the frame images in the GOP; accordingto the bit allocation weight, performing target bit allocation of the frame images; calculating the intra-frame gradient of a current LCU; judging whether the current frame image is the I frame or not, and if so, taking the intra-frame gradient as the gradient of the LCU; otherwise, calculating the inter-frame gradient of the LCU; judging whether the intra-frame gradient of the LCU is greater thanthe inter-frame gradient or not, and if so, taking the inter-frame gradient as the gradient of the LCU; otherwise, taking the intra-frame gradient as the gradient of the LCU; calculating the total gradient of the current frame image; and, according to the weight of the LCU complexity calculated based on the total gradient, performing target bit allocation on an LCU layer. According to the targetbit allocation method, system and device for H.265 code rate control disclosed by the invention, the target bit allocation accuracy is improved; and thus, the target bit allocation method, system anddevice for H.265 code rate control can be widely applied to the field of video coding.

Description

technical field [0001] The present invention relates to code rate control technology, in particular to a target bit allocation method, system and device for H.265 code rate control. Background technique [0002] Explanation of technical terms: [0003] GOP: Group of pictures. [0004] With the development of science and technology, the video resolution is gradually increased, and people's requirements for video quality are also continuously improved, which prompts the continuous improvement and update of video coding technology. H.265 was born as a new generation of video coding standard. Under the same application conditions and video quality, the code rate of H.265 is 50% lower than that of H.264 / AVC. about. [0005] In the actual application process, because the amount of information in each frame of the video sequence is different, the encoding bit rate fluctuates to a certain extent, and the storage space and transmission bandwidth are also limited, so it is necessar...

AI Technical Summary

Problems solved by technology

[0006] At present, the bit allocation scheme in the H.265 standard is realized by encoding frame information to obtain frame-level correlation characteristics, but it ignores the characteristics of the current frame and causes inaccurate bit allocation.

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