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System and method for controlling CCSDS (consultative committee for space data system) image compressing code in spatial TDICCD (time delayed integration charge coupled device) camera application

A technology of image compression and bit rate control, which is applied in image communication, television, electrical components, etc., can solve problems such as poor protection, and achieve the effects of improved quality, less computational complexity, and less memory usage

Inactive Publication Date: 2013-06-26
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

If all content in the image frame adopts an equal distribution code rate, it will not be able to protect the image edge and the area with rich texture information very well.

Method used

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  • System and method for controlling CCSDS (consultative committee for space data system) image compressing code in spatial TDICCD (time delayed integration charge coupled device) camera application
  • System and method for controlling CCSDS (consultative committee for space data system) image compressing code in spatial TDICCD (time delayed integration charge coupled device) camera application
  • System and method for controlling CCSDS (consultative committee for space data system) image compressing code in spatial TDICCD (time delayed integration charge coupled device) camera application

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Embodiment Construction

[0049] Invention idea of ​​the present invention is:

[0050] The CCSDS image compression code rate control system and method used by the space TDICCD camera of the present invention mainly according to the characteristics of the space CCD image and the problem that the equal distribution code rate of each coding segment in the CCSDS leads to the poor quality of the image reconstruction image, and a method suitable for A code rate control system and method for space CCD camera applications. The CCD image output in line units is organized into image frames, the image frame is divided into several image blocks, the information is estimated for each image block, and the code rate is allocated once according to the estimated information value of each image block. After wavelet transform and quantization in each image block, the wavelet coefficients are coded in units of segments. Secondary code rate allocation is performed on each segment. According to the wavelet transform coef...

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Abstract

The invention relates to a system and a method for controlling CCSDS (consultative committee for space data system) image compressing code in spatial TDICCD (time delayed integration charge coupled device) camera application. The system comprises image wavelet transformation, bit plane coding, entropy coding and code stream organization. A frame construction unit, image block information estimation and once code distribution are disposed in front of the image wavelet transform. Code section entropy estimation, secondary code distribution and a bit plane depth controller are disposed in the bit plane coding. The image is a CCD image using lines as unit. An M*N image is built by the frame construction unit to be used as a frame unit for compression. By the system and the method and secondary code distribution, self-adaptation code distribution can be performed to different image contents and code sections.

Description

technical field [0001] The invention belongs to the field of space TDICCD camera image compression, in particular to a CCSDS image compression code rate control system and method for space TDICCD cameras. Background technique [0002] At present, the compression algorithm suitable for on-board payload image compression application is the image compression algorithm developed by CCSDS for deep space applications. The code rate control in the CCSDS image compression algorithm can make the compressed code stream suitable for satellite data transmission bandwidth and real-time image transmission requirements. It is an important part of the space CCD image compression encoder unit and affects the compression encoder to a large extent. performance. The CCSDS algorithm provides two reference solutions, that is, quality-based truncation and bit rate truncation, but the specific implementation requires the developer's own design. When the quality truncation method is used to contro...

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Application Information

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IPC IPC(8): H04N7/26H04N7/50H04N19/146H04N19/61H04N19/63
Inventor 李进金龙旭李国宁
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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