Video coding method based on region of interest (ROI)

A region-of-interest and video coding technology, which is applied in the field of video coding based on regions of interest, can solve the problems of not considering the degree of interest of macroblocks and being unable to improve the subjective quality of regions of interest

Inactive Publication Date: 2011-01-12
ZHENJIANG TANGQIAO MICROELECTRONICS
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Problems solved by technology

Ordinary macroblock prediction mode selection technology does not consider the degree of interes

Method used

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  • Video coding method based on region of interest (ROI)
  • Video coding method based on region of interest (ROI)
  • Video coding method based on region of interest (ROI)

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Embodiment Construction

[0044] A region-of-interest-based video encoding method proposed by the present invention is applied in the encoding loop of a video encoder.

[0045] Such as figure 2 As shown, a video coding method based on a region of interest (ROI) works:

[0046] First, the video encoder receives the original video data of a macroblock, and the ROI preprocessing module classifies all the macroblocks in a frame by using the image content analysis method. Then, the mode selection module calculates the Lagrangian multiplier according to the macroblock class to which the current macroblock belongs. The video encoder uses this multiplier to select a macroblock prediction mode.

[0047] Then, the quantization parameter adjustment module adjusts the initial quantization parameter of the macroblock set according to the sensitivity of human vision to the current macroblock. The video encoder encodes the current macroblock according to the adjusted quantization parameter. Statistical informati...

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Abstract

The invention relates to a video coding method based on a region of interest (ROI). A video coder receives the original video data of a macroblock; an ROI preprocessing module divides the macroblocks in a frame image into ROI macroblocks and non-ROI macroblocks according to the ROI predefined by a user; if the user does not define the ROI, the macroblocks in the frame are categorized by adopting an image content analyzing method; the ROI preprocessing module calculates a Lagrangian multiplier; a quantification parameter adjusting module adjusts the sensitive degree of the current macroblock and the macroblock set initial quantification parameters according to the human vision; the video coder codes the current macroblocks according to the adjusted quantification parameters; and a multiple macroblock set bit allocation module distributes the target bits for each macroblock according to the macroblock set coding statistic information after the macroblocks in the frame are completely coded, and finally calculates the initial quantification parameter of each macroblock set.

Description

technical field [0001] The invention relates to a video coding method based on an area of ​​interest, which is applied in the field of video image coding, and can be applied to low-rate video coding in fields such as video monitoring and video conferencing. Background technique [0002] Low-rate video transmission is one of the important transmission services in bandwidth-limited network environments such as PSTN and mobile communications. Due to the limitation of network bandwidth, the image quality is always unsatisfactory. Low-rate video coding is not only used in narrowband network environments. With the introduction of high-definition video into applications such as video surveillance and video conferencing, existing broadband networks cannot meet the transmission of high-definition video streams, and there is also a great demand for low-rate video coding. [0003] Region of Interest (ROI, Range of Interest) video coding is an important research field of low-rate video ...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/50H04N19/124H04N19/147H04N19/167H04N19/19
Inventor 高伟孙翼
Owner ZHENJIANG TANGQIAO MICROELECTRONICS
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