A code rate control method for motion region detection based on HEVC
A motion area and bit rate control technology, applied in the field of video coding, can solve the problems of high hardware requirements, high computational complexity, memory consumption, etc., and achieve the effects of improved coding quality, strong portability, and quality improvement.
Active Publication Date: 2019-07-12
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
The background subtraction method needs to cache several frames when building and updating the background model, which will consume a lot of memory
The optical flow method can accurately calculate the speed of moving objects, and has good detection accuracy even in dynamic scenes, but the calculation complexity is high, and the hardware requirements are also high, so it is not suitable for real-time applications
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Embodiment 1
[0039] The present invention proposes a code rate control model based on HEVC under medium and low bit rate conditions. The model provides a coding method that can detect visual attention areas in video content and achieve better visual quality under medium and low bit rates. In this way, fast code rate allocation optimization can be realized. Concrete implementation method of the present invention is finished by following two steps:
[0040] 1. Implementation scheme of motion region detection technology based on inter-frame difference method, such as figure 2 Shown:
[0041] Input: the luminance component Y of the I frame to be encoded i and the luminance component Y of the previous coded I-frame i-1
[0042] Output: LCU Classified I-Frames
[0043] ① Initialize structure space and variables;
[0044] ②Find the absolute value matrix of brightness difference diff=|Y i -Y i-1 |;
[0045] ③Find the maximum brightness difference y in diff Max ;
[0046] ④ According to...
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The invention discloses an HEVC-based bit rate control method for motion region detection. The HEVC-based bit rate control method comprises the steps of: encoding a first GOP according to a bit rate control method of an HEVC encoder; starting from a second GOP, and marking LCU of each I frame for each I frame by adopting a motion region detection technology based on inter-frame differential method, wherein marker types include motion region, ordinary region and stationary region; adjusting QP of the LCU according to the marked LCU, decreasing the QP of the LCU marked as the motion region, increasing the QP of the LCU marked as the stationary region, and keeping the QP of the LCU marked as the ordinary region unchanged; encoding each LCU in the I frame according to the adjusted QP by adopting the bit rate control method of the HEVC encoder; and encoding B frames and P frames in the GOP according to the bit rate control method of the HEVC encoder. The HEVC-based bit rate control method cam detect a visual region of interest in video content at middle-and-low bit rate and ensures the visual quality of the visual region of interest, and realizes rapid and precise bit rate allocation optimization.
Description
technical field [0001] The present invention relates to the technical field of video coding, in particular to a HEVC-based code rate control method for motion region detection. Background technique [0002] When the bit rate is sufficient, the quality of each frame of the video can be guaranteed; however, when the bit rate is relatively insufficient, especially in high-resolution video applications, how to allocate limited bit resources more reasonably , in order to obtain better video coding quality, the bit rate allocation strategy is particularly important at this time. The ultimate recipient of video information is human, and human eyes are selective when watching video, and the visual focus will be attracted by certain specific information. Moving objects in the picture are often eye-catching. If the same objective distortion (such as MSE) occurs in the moving area as the stationary area, then the perceptual distortion produced by the moving area tends to be larger. ...
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IPC IPC(8): H04N19/114H04N19/172H04N19/543H04N19/147
CPCH04N19/114H04N19/147H04N19/172H04N19/543
Inventor 林育蓓郑奕新张星明林俊明
Owner SOUTH CHINA UNIV OF TECH