Dust Devils In Jezero Crater, single-point repository of imagery |
Dust Devils In Jezero Crater, single-point repository of imagery |
May 12 2021, 03:48 PM
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#31
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Member Group: Members Posts: 819 Joined: 3-June 04 From: Brittany, France Member No.: 79 |
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Jul 23 2021, 02:46 AM
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#32
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Member Group: Members Posts: 808 Joined: 10-October 06 From: Maynard Mass USA Member No.: 1241 |
Detecting Dust Devils with multiple images is fairly straightforward: average all the frames, and compare each image to the average -- use subtract, ratio, and other techniques.
Detecting faint DDs in one image requires a different approach: increase the contrast while retaining the image quality-- somehow. This is a test image from SOL 15 (!). The technique is Stochastic Equalization / Adaptive Contrast (SEAC) The image has a pronounced screendoor effect from the Bayer (in the sky) and has an overall 'old-timey postcard quality', but the DD is visible and the contrast is increased Another image 30 minutes before had no artifact at this position. --GIF -------------------- CLA CLL
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