Low storage coder based on code block in JPEG2000 standard and its coding method

An encoder and code block technology, applied in the field of image processing, can solve the problems rarely involved in saving memory, efficient structure, high power consumption, and achieve the effect of reducing storage capacity and power consumption

Inactive Publication Date: 2008-09-17
XIDIAN UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0009] Fourth, the aforementioned external storage consumes a lot of power in hardware implementation
The difference between the two is only in the source of the memory, and rarely involves efficient structures that save memory

Method used

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  • Low storage coder based on code block in JPEG2000 standard and its coding method
  • Low storage coder based on code block in JPEG2000 standard and its coding method
  • Low storage coder based on code block in JPEG2000 standard and its coding method

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Embodiment Construction

[0043] Encoder structure of the present invention adopts Xilinx ISE 9.1 integrated development software and VHDL, Verilog HDL language, realizes on the FPGA that the model of Xilinx company is XC4Vfx140-11ff1517.

[0044] refer to figure 1 According to the JPEG2000 standard, the code block-based low-storage coder structure proposed by the present invention includes: a wavelet transform module, an address mapping module, a wavelet coefficient storage area corresponding to each sub-band, a code block arbitration module to be coded, and a bit-plane coding module.

[0045] The wavelet transform module first performs discrete wavelet transform on the original image to obtain the wavelet coefficients in the frequency domain, which are output to the address mapping module. The address mapping module is composed of several binary counters. The number of these binary counters is the same as the number of stages of wavelet decomposition. The address mapping module maps the address of th...

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Abstract

The invention discloses a code-block-based low storage coder in JPEG2000 standard and the coding method thereof. The encoder comprises a wavelet transform module, an address mapping module, wavelet coefficient storing regions, an arbitration module for a code-block to be coded and a bit planar coding module. The wavelet transform module performs multi-level wavelet transform on an original image; the address mapping module maps a transform coefficient corresponding to the address of a wavelet decomposed image to an address stored in a specific wavelet coefficient storing region; the wavelet coefficient storing regions store wavelet coefficients calculated by the wavelet transform module; arbitration module for a code-block to be coded temporarily stores the code-block information not processed subsequently, and prepares the wavelet coefficients in a completely stored code-block for bit planar coding; the bit planar coding module codes and updates the coding state variables. The invention has the advantages of good image compression quality and small system occupancy storage capacity, and can be used for image compression coding for various digital equipments, especially for compression systems of high resolution images.

Description

technical field [0001] The invention belongs to the technical field of image processing and relates to compression coding, in particular to a low-storage coder and method in the still image compression standard JPEG2000, which is used for various digital image compression coding conforming to the JPEG2000 standard. Background technique [0002] With the development of multimedia and network technology and its application in medical imaging, remote sensing images and digital image / video transmission, the previous image compression coding methods have been unable to meet the requirements of efficient compression, real-time transmission and efficient storage. As the latest general standard for still image compression in the world, JPEG2000 has obvious advantages, such as: supporting single-component or multi-component lossy and lossless encoding, still having good performance at low bit rates, and also supporting image quality and resolution progressive transmission, region of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26G06T9/00H04N19/176H04N19/60
Inventor 李云松郭杰刘凯王柯俨雷杰吴成柯
Owner XIDIAN UNIV
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