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2. Comparison of image viewers - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_image_viewers

   All major formats, thumbnail view (6 predefined sizes), full screen, magnifier, slideshow. Uses second monitor for fullscreen preview. Popups image gallery, detailed image informations, editing options at the image border in fullscreen modus.

3. Wikipedia:Removal of non-free images - Wikipedia

   en.wikipedia.org/wiki/Wikipedia:Removal_of_non...

   Instead, you can list the image without actually displaying it. For example, let's say this image was a fair use image: If it were a fair use image (it isn't, it is in the public domain as a work of the U.S. government), then displaying it on one's userspace (or here in the Wikipedia project space) would be against policy. So, alternatively one ...

4. Foreground detection - Wikipedia

   en.wikipedia.org/wiki/Foreground_detection

   For calculating the image containing only the background, a series of preceding images are averaged. For calculating the background image at the instant t: (,,) = = (,,) where N is the number of preceding images taken for averaging. This averaging refers to averaging corresponding pixels in the given images.

5. Image subtraction - Wikipedia

   en.wikipedia.org/wiki/Image_subtraction

   Thus, image processing algorithms can make the fixed stars in the background disappear, leaving only the target. [2] Distinct families of astronomical image subtraction techniques have emerged, operating in both image space [ 3 ] [ 4 ] or frequency space, [ 5 ] [ 6 ] with distinct trade-offs in both quality of subtraction and computational cost.

6. Wikipedia:Guide to image deletion - Wikipedia

   en.wikipedia.org/wiki/Wikipedia:Guide_to_image...

   with vague or inappropriate justifications that do not meet non-free content guidelines, tag the image as {{subst:dfu|reason that the image does not meet the criteria}}. that are replaceable by a free image that could be found or created, tag the image as {}. that are not being used in any article, tag the image as {{subst:orfud}}.

7. Super-resolution imaging - Wikipedia

   en.wikipedia.org/wiki/Super-resolution_imaging

   Given a sufficient number of observation images, and if the set of observations vary in their phase (i.e. if the images of the scene are shifted by a sub-pixel amount), then the phase information can be used to separate the aliased high-frequency content from the true low-frequency content, and the full-resolution image can be accurately ...