MSL - Astronomical Observations, Phobos/Deimos, planetary/celestial observations and more |
MSL - Astronomical Observations, Phobos/Deimos, planetary/celestial observations and more |
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#31
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![]() Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 4252 Joined: 17-January 05 Member No.: 152 ![]() |
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#32
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 ![]() |
The 17 Sol 351 Mastcam Right Phobos images available by now can be processed in a way to get a glance at the dark side of Phobos:
![]() Processing roughly sketched: - Calculating with double precision floating point rgb values, - magnifying twice, interpolating subpixels, - registering images to Phobos, iteratively by brightness barycenter of shrinking region (reducing Deimos effect), then by least squares of image deltas. - averaging each pixel pos over main mode (accepting 20/256 delta from average) of all frames to filter out Deimos, stars, artifacts, and to reduce noise, - subtracting background (estimated to 27/256 grey value), - using logarithm to get bright and dark colors within 8-bit rgb range, - additional manual stretching (brightness, saturation). Some chromatic aberration seems to get visible this way. Some processing artifacts (bright pixels) seem to be induced by (undefined) logarithm of 0 for pixels below 27/256, can be fixed. I've been trying to suggest, that long exposure times can be simulated successfully by registered image sequences, and that motion blur can be limited at the same time. So I'm optimistic, that comet observations will become possible. |
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