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Image high-speed compression method and system based on FPGA under CCSDS standard

A compression method and image technology, which is applied in image communication, digital video signal modification, electrical components, etc., can solve the problems of increased hardware resource consumption and limited space-borne equipment resources, and achieves strong adaptability, wide application range, and resource utilization. little effect

Active Publication Date: 2021-11-05
SHENYANG AEROSPACE UNIVERSITY
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Problems solved by technology

Whether using parallel processing or converting BIL to BIP format and then processing it will greatly increase the consumption of hardware resources
However, the resources of spaceborne equipment are extremely limited

Method used

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  • Image high-speed compression method and system based on FPGA under CCSDS standard
  • Image high-speed compression method and system based on FPGA under CCSDS standard
  • Image high-speed compression method and system based on FPGA under CCSDS standard

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Embodiment Construction

[0063] The invention will be further described below in conjunction with the accompanying drawings and specific implementation examples.

[0064] Such as figure 1 As shown, a high-speed image compression method based on FPGA under the CCSDS standard, including:

[0065] Step 1: extract the pixel values ​​in the spectral image data, and generate the area flag signal and spectrum band flag signal where each pixel value is located; including:

[0066] Step 1.1: Use BIL mode to collect spectral images, and configure the width and spectrum parameters of the image. After configuration, the trigger latches the width and spectrum parameters of the image;

[0067] Step 1.2: Store the collected spectral image data into FIFO for caching, the collected image data and configured parameters are processed across clocks and then output to the spectrum cache sub-module, and in the spectrum cache sub-module by connecting 4 FIFOs in series, At the same time, the data of the current spectrum an...

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Abstract

The invention provides an image high-speed compression method and system based on an FPGA (Field Programmable Gate Array) under a CCSDS (Consultative Committee for Space Data System) standard. Theimage high-speed compression method comprises the following steps of: firstly, extracting pixel values in spectral image data, generating a region mark signal and a spectral band mark signal of each pixel value, predicting a weight vector of each pixel according to a comparison mark bit and a predicted value of a central local difference by adopting a forward prediction mode, and obtaining an error value between a pixel true value and a predicted value, and then coding all error values in a Golomb-Rice coding mode to realize lossless compression of image data. According to the method and system, a lossless data compression algorithm of the CCSDS120.2-G-1 standard is analyzed, a forward prediction mode is adopted according to the characteristics of a feedback loop of the algorithm, meanwhile, the calculated amount in a key path is reduced, a full-pipeline structure of hardware is achieved; the method and system can be applied to hyperspectral image compression in the fields of geological exploration, agricultural research, satellite-borne remote sensing image research and the like, and is particularly suitable for real-time compression of hyperspectral image data of satellites or space stations.

Description

technical field [0001] The invention relates to the technical field of spectral image processing, in particular to an FPGA-based high-speed image compression method and system under the CCSDS standard. Background technique [0002] In order to meet the requirements for ground observation and space observation, the resolution of spaceborne hyperspectral cameras is gradually increasing, and the rapidly expanding amount of hyperspectral image data puts great pressure on the data transmission system. In the case of limited downlink bandwidth of the data transmission system and insufficient storage capacity of the data memory carried by the spacecraft, compressed transmission of hyperspectral image data has become the most effective means to solve these problems. [0003] The CCSDS120.2-G-1 standard is a lossless compression standard issued by the Spatial Data System Advisory Committee. This standard is a prediction-based compression algorithm. The difference from the traditional...

Claims

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Application Information

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IPC IPC(8): H04N19/159H04N19/182H04N19/42
CPCH04N19/159H04N19/182H04N19/42Y02D10/00
Inventor 张丽丽刘雨轩张雷屈乐乐王尔申
Owner SHENYANG AEROSPACE UNIVERSITY
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