Deep-sky image live stacking via star descriptor 
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1 State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China
2 Computer Science Department, University of Southern California, 941 Bloom Walk, Los Angeles, CA 90089, USA
Figures & Tables
Fig. 1. Flow diagram of our proposed algorithm.
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Fig. 2. Comparison of thresholding results: (a) Original M42 image. (b) Otsu result. (c) Our result.
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Fig. 3. Schematic diagram of the rotation invariant descriptor.
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Fig. 4. Description results using our proposed star descriptor.
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Fig. 5. Matching results using SIFT, SURF, and our descriptor. (a) Star detection results. (b) SIFT result. (c) SURF result. (d) Our result.
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Fig. 6. Matching ratio results among SIFT, SURF, and our descriptor.
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Fig. 7. Live stacking results while photographing M51. (a) No stack. (b) Three frames stacked. (c) Six frames stacked. (d) Nine frames stacked.
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Fig. 8. Comparison results using ten-frames-stacked M92 images and their zoomed views. (a) Result with alignment enabled. (b) Result with alignment disabled.
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Table1. Quantitative Registration Evaluation Against SIFT and SURF
| | RMSE |
|---|
| SIFT | 0.8880 | 0.4051 | 0.0161 | 0.1150 | 0.7101 | 0.8650 | 0.4309 | 0.9072 | 0.4314 | 0.9771 | | SURF | 0.1475 | 0.2306 | 0.0152 | 0.0704 | 0.4595 | 0.7986 | 0.0199 | 0.5854 | 0.3452 | 0.7318 | | OUR | 0.0106 | 0.0180 | 0.0143 | 0.0455 | 0.0224 | 0.0281 | 0.0127 | 0.0380 | 0.0307 | 0.0230 | | Joint Entropy | | SIFT | 9.3339 | 9.3715 | 8.3369 | 9.3600 | 9.4503 | 9.3734 | 7.0749 | 9.3636 | 9.3717 | 9.8534 | | SURF | 9.3354 | 9.3711 | 7.3365 | 9.3588 | 9.3185 | 9.3651 | 6.2628 | 9.3414 | 9.3663 | 7.2840 | | OUR | 6.0073 | 6.2474 | 6.6522 | 8.0960 | 6.8046 | 7.0414 | 6.1535 | 7.0749 | 7.4858 | 6.8305 |
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Haiyang Zhou, Yunzhi Yu. Deep-sky image live stacking via star descriptor[J]. Chinese Optics Letters, 2016, 14(12): 121501.
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