基于实时星点定位的感兴趣区域星图压缩方法

doi:10.13229/j.cnki.jdxbgxb.20240734

Abstract

Abstract:

To solve the problem of storing and transmitting star maps by space detection cameras， a method of compression of star maps of region of interest based on real-time star location is proposed in this paper. First， the top hat algorithm of the ring structure element is used to separate the star object and the background in the star map. Then， through the improved star location algorithm， the star target is detected and the coordinates are output while scanning the star map. Then， the star image is obtained by opening the window in real time according to the star coordinates of the original star map. The star image is lossless compressed by JPEG-LS image compression algorithm， and the original star map background is compressed by near lossless compression with adjustable parameters. FPGA simulation results show that the processing time of the proposed method increases by less than 6% on the basis of scanning a star map with less than 20 star points. When the background compression parameter is 2， the compression ratio of the proposed method is more than 2 times higher than that of JPEG-LS lossless compression algorithm， and the PSNR is greater than 40 dB and SSIM is greater than 0.95. This method has obvious advantages in compression performance and has significant engineering application value.

Key words: signals and signal processing, region of interst star map compression, real-time star location, JPEG-LS

CLC Number:

V448.22

Liu ZHANG,Jia-xin LIANG,He LIU,Gui-xiang ZHANG,Wei LIU,Yan LI,Jia-bao ZHANG. Region of interest star map compression method based on real-time star location[J].Journal of Jilin University(Engineering and Technology Edition), 2026, 56(3): 802-810.

Figures/Tables 11

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References 17

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测试图像名	JPEG-LS无损压缩	感兴趣区域星图压缩
测试图像名	JPEG-LS无损压缩	背景near=1	背景near=2
月光干扰图1	3.419	7.897	15.546
月光干扰图2	3.325	7.532	15.556
高斯噪声图1	2.032	3.262	4.411
高斯噪声图2	2.033	3.263	4.410
均匀噪声图1	2.029	3.250	4.403
均匀噪声图2	2.029	3.250	4.042
线性噪声图1	3.580	5.740	7.176
线性噪声图2	3.580	5.739	7.722

测试图像名	感兴趣区域星图压缩（near=1）		JPEG2000 （near=1）		感兴趣区域星图压缩（near=2）		JPEG2000 （near=2）
测试图像名	PSNR	SSIM	PSNR	SSIM	PSNR	SSIM	PSNR	SSIM
高斯噪声图1	49.405	0.992	46.534	0.983	45.145	0.975	43.806	0.967
高斯噪声图2	49.905	0.991	46.515	0.983	45.154	0.975	43.834	0.968
均匀噪声图1	49.890	0.992	46.471	0.983	45.123	0.975	43.784	0.966
均匀噪声图2	49.894	0.992	46.483	0.983	45.429	0.975	44.329	0.972
线性噪声图1	51.955	0.991	49.177	0.990	47.070	0.971	46.376	0.982
线性噪声图2	51.970	0.991	49.248	0.990	47.049	0.971	46.374	0.982
月光干扰图1	50.427	0.992	49.436	0.990	46.262	0.981	46.955	0.983
月光干扰图2	50.367	0.992	49.265	0.989	46.273	0.982	46.930	0.983

Region of interest star map compression method based on real-time star location

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