Tingwei GUO, Honglian HUANG, Xiaobing SUN, Xiao LIU, Rufang TI. Detection and removal of thin clouds in multispectral images of HJ-2A/B satellites[J]. Journal of Atmospheric and Environmental Optics, 2023, 18(4): 383
- Journal of Atmospheric and Environmental Optics
- Vol. 18, Issue 4, 383 (2023)
Fig. 1. HTM formed by extrapolating from the blue band with different window sizes. (a) Original image; (b)
Fig. 2. Judgment results of different window sizes for thin cloud masks. (a) Original image; (b)
Fig. 3. Effect of different window sizes on the final image for each band. (a) Original image; (b)
Fig. 4. Normalized spectral response curves of each spectrum segment for each CCD camera. (a) CCD 1; (b) CCD 2; (c) CCD 3; (d) CCD 4
Fig. 5. Technical route for thin cloud removal in multispectral remote sensing images
Fig. 6. Highlighted object area in area A. (a) Original image; (b) highlighted area
Fig. 7. Area A and its HTM image. (a) Original image; (b) HTM image
Fig. 8. Cloud mask image of area A. (a) Original image; (b) cloud mask image
Fig. 9. HTMi calculation results of each band in area A. (a) Band 1; (b) band 2; (c) band 3; (d) band 4; (e) band 5
Fig. 10. Linear regression coefficient of each band in area A. (a) Band 1; (b) band 2; (c) band 3; (d) band 4; (e) band 5
Fig. 11. The images for area A-D before and after thin cloud removal. (a) Original images; (b) images after removing thin clouds
Fig. 12. Comparison of clarity before and after thin cloud removal in area A-D. (a) Area A; (b) area B; (c) area C; (d) area D
Fig. 13. Comparision of image contrast before and after thin cloud removal in area A-D. (a) Area A; (b) area B; (c) area C; (d) area D
Fig. 14. Comparison of image standard deviation before and after thin cloud removal in area A-D. (a) Area A; (b) area B; (c) area C; (d) area D
Fig. 15. Histogram area selection of cloud-free area before and after thin cloud removal in area A. (a) Original image; (b) after thin cloud removal
Fig. 16. The histogram results of the cloud-free area for different bands before and after thin cloud removal in area A. (a) Original images; (b) after removing thin clouds
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Table 1. Radiance gain coefficients of different CCD cameras in different wavebands
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