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Coding method of jpeg2000 region of interest based on pre-truncation

A technology of region of interest and coding method, which is applied in the field of region of interest coding problems, can solve problems such as less calculation amount of the system, increase of JPEG2000 system calculation amount, unfavorable system maintenance, etc., to simplify the area table, improve indexing efficiency, increase system The effect of calculation volume

Active Publication Date: 2018-07-24
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this kind of algorithm greatly increases the calculation amount of JPEG2000 system due to the increase of the number of coefficient bit planes, especially for JPEG2000 hardware system, subsequent BPC, AC and optimized truncation modules need to make adaptive changes, which is not conducive to the system maintain
Other ROI coding methods, such as the implicit weighting method, increase the amount of system calculation less, but cannot obtain the ROI coding quality comparable to the coefficient shift method
In conclusion, current ROI coding techniques cannot balance ROI coding quality and system computation

Method used

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  • Coding method of jpeg2000 region of interest based on pre-truncation
  • Coding method of jpeg2000 region of interest based on pre-truncation
  • Coding method of jpeg2000 region of interest based on pre-truncation

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Embodiment

[0042] Embed the pre-truncation method into the existing JPEG2000 system (the image size is 512×512, the code block size is 32×32, 3 layers of 9 / 7 wavelet transform, the number of coefficient bit planes S after quantization is 11), and apply it to the collected image Scenarios dominated by low-frequency information (corridor monitoring). The encoding process of the pre-truncation method is as follows: figure 1 shown. In order to precisely control the number of bit planes reserved for the background at different bit rates and ROI areas, so that the ROI can obtain high quality while the background can maintain a certain degree of recognition, it is necessary to customize the bit rate lookup table and area lookup table for this scene before the system application . Before the system runs for the first time, two tasks need to be done:

[0043] a) Establish code rate lookup table. Process such as figure 2 as shown, figure 2 For a general process, N is set to 10 in the curre...

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Abstract

The present invention proposes a JPEG2000 ROI encoding method based on pre-truncation, which is located between wavelet transform and bit-plane encoding in the JPEG2000 system, and is suitable for applications where a given code rate or background is not important. The present invention allocates more code streams to the region of interest by appropriately reducing the accuracy of the background coefficient, and performs excellently in terms of the coding quality of the region of interest and the amount of system calculation. The specific process is as follows: 1. In a specific application, the code rate Lookup table; 2. In specific application occasions, establish an area lookup table; 3. Index the code rate and area lookup table with code rate and area of ​​interest area respectively, and calculate the output sum of the two lookup tables; 4. According to the original image Calculate the ROI position in each wavelet sub-band; 5. Pre-truncate the background coefficient.

Description

technical field [0001] The invention relates to a region-of-interest encoding method used in Joint Photographic Experts Group (JPEG2000), in particular to the region-of-interest encoding problem under the occasion of given encoding code rate or unimportant background. Background technique [0002] At present, the latest international JPEG2000 standard has the qualities of intra-frame coding, good compression effect, support for Region of Interest (ROI) coding and progressive transmission, so it has been promoted in high-end digital image applications. In the JPEG2000 system without ROI coding, the original image is first processed by discrete wavelet (DWT), and then bit-plane coding (BPC) and arithmetic coding (Arithmetic Coding, AC) are used to obtain the code stream of each code block , and finally optimize the truncated code stream and organize the output. [0003] ROI coding encodes part of the image with higher quality, and in applications where the bit rate is limited...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/167H04N19/21H04N19/64
Inventor 王建新朱恩王健钱进姜军祁友杰
Owner SOUTHEAST UNIV