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Image compression method and device for real-time code rate pre-distribution

An image compression and pre-allocation technology, applied in the field of image processing, can solve problems such as poor flexibility and high difficulty in implementing complex algorithms, and achieve simple implementation, broad market prospects and practical application value, and improve coding efficiency.

Inactive Publication Date: 2013-07-10
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

At present, some image compression processing systems use FPGA to implement reconfigurable computing systems, which have fast operation speed, but it is difficult to implement complex algorithms and has poor flexibility.

Method used

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  • Image compression method and device for real-time code rate pre-distribution

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Embodiment Construction

[0021] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] See figure 1 Show that the compression method process of the present invention comprises:

[0023] Step S1: Preprocessing the input original image data to obtain the DC level shift of the original image data;

[0024] Step S2: Utilize the hardware description language (VHDL) to design the intelligent characteristic (IP) core of multi-level two-dimensional 5 / 3 wavelet transform in field programmable logic device, only need the intelligent characteristic of multi-level two-dimensional 5 / 3 wavelet transform ( IP) The core caches three lines of original image data to realize multi-level integer wavelet transform to remove the correlation redundancy between the original image pixels and obtain the sub-bands at all levels of the image; ...

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Abstract

The invention discloses an image compression method and device for real-time code rate pre-distribution. The method comprises the steps of transform, code rate pre-distribution and entropy coding, wherein multilevel integer wavelet transform is adopted in the transform to remove related redundancy among original image pixels, to-be-contributed code rate of each sub band in actual coding is guidedby combining the rate distortion theory and the importance principle of each sub band of the transformed image on image reconstruction quality influence, and the final entropy coding is guided by using the pre-distributed code rate to realize real-time stop of the coding rate. The tasks of the method are divided in the compression device, the compression device comprises a field programmable gatearray (FPGA) and a digital signal processor (DSP), high-speed multilevel integer wavelet transform is realized by using the FPGA, and the transformed data are transmitted to the DSP through a high-speed serial input output (SRIO) module interface and are compressed and coded. By using the current most typical embedded architecture and combining the corresponding mathematical principle, the storage space of mass data is effectively saved, and the limited transmission bandwidth problem is solved.

Description

technical field [0001] The invention belongs to the field of image processing, and relates to a method for encoding images in real time and an engineering realization device thereof. In particular, the code rate pre-allocation image compression method based on wavelet analysis and Shannon information theory and the image compression processing device based on field programmable logic device and digital signal processor (FPGA+DSP). Background technique [0002] With the development of aerospace science and technology, the payload of space vehicles and the resolution and sampling rate of CCD cameras carried by them continue to increase, which will inevitably bring heavy pressure to the limited transmission channel bandwidth and large-capacity data recording systems. Therefore, the application of image compression technology has become an urgent need, and the purpose of image coding is to compress image data. There are many image compression methods, which can be divided into ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N5/232H04N19/91
Inventor 任国强李其虎姚俊黄静张峰
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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