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Image whiteout RRS feed

  • Question

  • From its description, I think that I'm running into a similar problem as this post:

    http://social.microsoft.com/Forums/en-US/ice/thread/0e4aa5d4-0864-4ed1-99c9-a5bd127ba4ef

    Here's my situation.  I have a bunch of images that were taken with an infrared camera under magnification. The basic process is that we snap a shot, move the platform underneath the camera, and snap another shot.  I guess it's kind of like taking multiple images underneath a scanner bed.  ICE seems to work brilliantly at stitching these together in structured panoramic mode.  The only problem is that after I stich about 3 images together, the image on the far right starts turning totally white.  I've attached a couple of samples.  Is there any way around this?  Unfortunately, the left 25% of each image is dark, due to an issue with either the camera or lens (neither of which are under my control to fix).  We overlapped each image to try and mitigate that issue.  Even if there's nothing that ICE can do to resolve this, is there anything that I can do to the images (e.g. preprocessing) to make ICE a little happier?  Unfortunately, recollecting these images isn't really an option either.  Any help would be appreciated.

    Friday, September 7, 2012 7:24 PM

All replies

  • After determining alignment, there are two main steps in the composition process: (1) picking where to put the seams between the images, then (2) adjusting the image colors/intensities to make the seams invisible. I'm guessing that what is happening here is that ICE is choosing to transition between the images somewhere where one image is dark and the other is not, causing the over brightening. 

    One way that you might be able to work around this is to add an alpha channel to the images. If you create an alpha channel in the images that is '0'/transparent where the images are too dark then ICE will no longer consider these pixels for inclusion in the result.

    Monday, September 10, 2012 2:47 AM
  • Perhaps I'm misunderstanding you because I have almost no experience with this.  But I went back and added alpha channels to each image, then cut away the dark rectangle to the left of each image (so that gimp is showing me the checkerboard pattern that I think is indicative of transparency).  When I do that, I still get the results above with the rightmost side of the image totally white.  Do I have any other options?

    Friday, September 14, 2012 8:15 PM
  • Do you have a small set of images that show the issue?  If so could you post them somewhere that we can take a look?

    Friday, September 14, 2012 11:13 PM
  • Sure, I've posted links to images used to create the panoramas above.  They're in order, top link is the left-most image, center link is the center image, and bottom link is the right-most image.  The first group of images (png) are those that I cropped with the alpha channels.  The second group (jpg) are the originals.  I had to use the structured panorama to get the images above.  Thanks for all of your help!

    http://i1164.photobucket.com/albums/q572/jpnw/6b6b0794.png

    http://i1164.photobucket.com/albums/q572/jpnw/ac60fd9c.png

    http://i1164.photobucket.com/albums/q572/jpnw/83d87680.png

    http://i1164.photobucket.com/albums/q572/jpnw/2cf0d1f9.jpg

    http://i1164.photobucket.com/albums/q572/jpnw/0cc37d62.jpg

    http://i1164.photobucket.com/albums/q572/jpnw/274401df.jpg

    Monday, September 17, 2012 8:54 PM