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HEVC (High Efficiency Video Coding) code rate control method based on region-of-interest

A region of interest and rate control technology, applied in the field of HEVC rate control based on region of interest

Active Publication Date: 2015-11-11
SHANGHAI UNIV
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Problems solved by technology

However, the existing rate control does not take this aspect into account

Method used

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  • HEVC (High Efficiency Video Coding) code rate control method based on region-of-interest
  • HEVC (High Efficiency Video Coding) code rate control method based on region-of-interest
  • HEVC (High Efficiency Video Coding) code rate control method based on region-of-interest

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[0064] The technical solutions of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0065] Take the test sequence Tennis recommended by coding JCT-VC as an example, HM10.0 is adopted in the example of the present invention, the encoder GOP is a layered B frame structure, the number of B frames in a GOP is 7, and the number of I frames or P frames is 1. The video encoding frame rate is 24 frames per second, the encoding frame number is 240 frames, and the target bit rate is set to 1000kbps. Such as figure 1 As shown, an HEVC code rate control method based on the region of interest in this embodiment is as follows: before starting to encode a frame of the sequence, first obtain the saliency map of the spatial domain of the frame through the GBVS (GraphBasedVisualSaliency) model, and then use the motion vector information The saliency map in the time domain of each frame is obtained, and the two saliency maps are fus...

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Abstract

The invention provides an HEVC (High Efficiency Video Coding) code rate control method based on region-of-interest. The HEVC code rate control method based on region-of-interest comprises the steps: generating a spatial domain significance graph of the current frame according to a GBVS (Graph Based Visual Saliency) model; generating a time domain significance graph of the current frame through motion vector information; integrating the time domain significance graph and the spatial domain significance graph by using the consistency normalization method to obtain the eventual significance graph; performing regional division for the current frame image by using the significance graph so as to divide the region into a region-of-interest and a non-region-of-interest; performing bit distribution for the region-of-interest and the non-region-of-interest respectively; performing bit distribution for each LCU in the current frame according to the significance; calculating lambda and a QP (Quantization Parameter) value according to the distributed code rate, and clipping and correcting the lambda and the QP value; and performing coding by using the eventually obtained lambda and the QP value. The HEVC code rate control method based on region-of-interest can improve the subjective quality for video coding and accurately control the output bit at the same time.

Description

technical field [0001] The invention belongs to the technical field of multimedia communication, and in particular relates to an HEVC (High Efficiency Video Coding, High Efficiency Video Coding) code rate control method based on an area of ​​interest. Background technique [0002] In the process of video encoding, the output video quality and bit rate are closely related. If the output video quality is better, the output bit rate will be higher. However, due to the limitation of bandwidth or storage capacity, it is necessary to control the number of output bits of the video encoder within a certain range, so as to obtain the best video image as possible at the decoding end while meeting the limitation of bandwidth or storage capacity. Here The control strategy adopted is rate control. The human visual system (HumanVisualSystem, HVS) can quickly locate the "significant" or "interesting" objects in the video, and then recognize these objects, mainly because HVS can quickly sc...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/146H04N19/167
Inventor 沈礼权胡乾乾赵振军李飞飞张兆扬
Owner SHANGHAI UNIV
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