Reprocessing Historical Images - II, Restoring images from antiquated and/or poor quality sources |
Reprocessing Historical Images - II, Restoring images from antiquated and/or poor quality sources |
Aug 29 2008, 03:34 PM
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Interplanetary Dumpster Diver Group: Admin Posts: 4404 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
I figure that it is time for another thread like this. I still find it astonishing to see the versions of a lot of images that are reproduced over and over again. For example, this is the last mosaic of Triton taken before the close encounter began. The version on the Planetary Photojournal is on the left, my version on the right. Clearly, this image was produced as part of the "instant science" campaign. They did a superb job getting images to the public in a speedy manner, but they are extremely rough, since the team was busy running the spacecraft. However, it is this version that keeps being recycled. Worse, the version on the photojournal is clearly scanned from a printed copy, causing further degradation.
Here is a similar comparison, this time using Proteus (still 1989N-1 on the Planetary Photojournal!). This discussion started in the thread about Viking crescents but was getting off topic, so I thought I would start a new thread here. -------------------- |
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Feb 3 2009, 06:13 PM
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Member Group: Members Posts: 378 Joined: 21-April 05 From: Portugal Member No.: 347 |
Hi all,
I wrote a small program in Actionscript 3 (Flash) that performs linear interpolation to 8 bits on images with low bit levels originally. It's very basic and only works in one axis, but i can get around that simply rotating the original image 90º and averaging the results with the non rotated interpolation. I tried it on the Voyager 2 Proteus image discussed in earlier posts. I must say I like the results. The raw image was histogram stretched and cleaned of noise before interpolation. The interpolated image was then processed in Photoshop. What I got is the image bellow. Any ideas regarding other good images to test the program, besides the Viking sunset/sunrise images that I've already thought about? -------------------- _______________________
www.astrosurf.com/nunes |
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Feb 4 2009, 02:46 AM
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Interplanetary Dumpster Diver Group: Admin Posts: 4404 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
That looks like a good result, but could you explain your use of "interpolated." Usually it is used to remove missing lines and pixels, but I am assuming this is used to reduce the "stair-stepping" effect. Am I correct?
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