High order bit reconstruction |
High order bit reconstruction |
Feb 24 2015, 12:16 PM
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#1
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Member Group: Members Posts: 241 Joined: 22-August 05 From: Stockholm Sweden Member No.: 468 |
I have noticed that Cassini sometimes sends back images as 8bit by dropping the high order values in the 16 bit data. (edit: correction, the 12bit original data)
I wrote some code that follows the gradients in the images and tries to guess the most likely high order bits. Then i use manual methods to fix the areas where my code got it wrong... Am I reinventing the wheel here? Is there any official method for dealing with these kinds of images? |
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Feb 26 2015, 07:50 PM
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#2
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Senior Member Group: Members Posts: 1591 Joined: 14-October 05 From: Vermont Member No.: 530 |
Why are images sometimes mangled this way? What factors lead to it?
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Feb 27 2015, 12:19 PM
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#3
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Member Group: Members Posts: 241 Joined: 22-August 05 From: Stockholm Sweden Member No.: 468 |
I would guess that it is a storage space issue. When saving 8 instead of 12bit images one can save 4 bits per pixel to do other things. You end up being able to shoot extra frames before the memory fills up. For a once in a mission encounter I guess they try to eek out as many observations as possible. Since it is an orbiting mission we only see this happening on a few occasions.
And if someone as crappy a programmer as me can get a reasonable reconstruction of the data it seems like a good trade off... |
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