A wavelet transform system and method for fpga-based spaceborne image compression
A wavelet transform and image compression technology, applied in image coding, image data processing, instruments, etc., can solve problems such as resource reduction and aerospace application reliability reduction, and achieve the effect of reducing usage
Inactive Publication Date: 2011-12-21
NAT SPACE SCI CENT CAS
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[0005] The purpose of the present invention is to overcome the problem that the reliability of aerospace applications is reduced and the internal resources of the FPGA are greatly reduced by using multi-chip external SRAMs in order to overcome the prior art when compressing multi-level two-dimensional wavelet transform pipelines for space-borne images. At the same time, in order to realize the pipeline operation between wavelet transform modules and save FPGA internal registers, etc., the present invention provides a wavelet transform system and method based on FPGA-based spaceborne image compression
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[0077] For a 512x512 image block, the FIFO series group used is as follows Figure 5 As shown, the calculation control strategy of the FIFO series group is shown in Table 2 below:
[0078] Table 2
[0079]
[0080] Simulation results such as Figure 6 As shown, it can be seen that the output enable signal in the three-level conversion does not have a period that is valid at the same time, that is, there is no simultaneous writing to the SRAM. Therefore, there is no need to cache data of 10 subbands, which greatly saves storage resources. This design can ensure that the wavelet transform module only utilizes two SRAMs outside the FPGA to realize pipeline operation, and the speed reaches the limit.
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The invention provides a multi-stage wavelet transformation method and a multi-stage wavelet transformation system for satellite borne image compression based on a field programmable gate array (FPGA). In the method, wavelet parameters which are output in each stage 9 / 7 wavelet transformation are combined into one-channel output, so flow line operation is realized. The method for combining the wavelet parameters which are output in each stage 9 / 7 wavelet transformation into one-channel output comprises the following steps of: buffering data which is subjected to line transformation by using aplurality of internal first-in first-out buffers which are connected in series; performing column transformation after buffering a certain number of pieces of line data; sending LL sub-band data of one-stage transformation by using a discontinuous intermittent strategy into a two-stage transformation module, and delaying LH, HL and HH sub-band data of one-stage transformation by a delay unit for a plurality of periods and then outputting the data; sending the LL sub-band data of two-stage transformation by using the discontinuous intermittent strategy into a three-stage transformation module,and delaying the LH, HL and HH sub-band data of two-stage transformation by the delay unit for the plurality of periods and then outputting the data; according to the analogy, performing multi-stage wavelet transformation at the same time; and finally, combining the sub-band data of each stage transformation into one-channel direct output.
Description
technical field [0001] The invention relates to the field of image compression, in particular to an FPGA-based spaceborne image compression wavelet transform system and method. Background technique [0002] In recent years, with the rapid development of my country's aerospace technology, the number and accuracy of satellite sensing and detection equipment have increased greatly compared to before, and the amount of image data acquired by satellites during the effective observation period is increasing. "Image data puts enormous pressure on storage and transmission. Since the capacity of the on-board memory is limited by volume, weight, power consumption, etc., it is impossible to increase infinitely, and the transmission capacity of the satellite-ground downlink is limited by the transmission bandwidth and the limited visibility time of the ground station. Orbit image compression has become an essential part of on-board data processing. The development of a high-performance...
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IPC IPC(8): G06T9/00
Inventor 顾晓东陈军王怀超安军社陈晓敏
Owner NAT SPACE SCI CENT CAS