Multimedia Gallery
September 30, 2015
Images credited to the National Science Foundation, a federal agency, are in the public domain. The images were created by employees of the United States Government as part of their official duties or prepared by contractors as "works for hire" for NSF. You may freely use NSF-credited images and, at your discretion, credit NSF with a "Courtesy: National Science Foundation" notation.
Additional information about general usage can be found in Conditions.
The Structural SIMilarity (SSIM) index provides an improved measure of image quality.
In the following image, all distorted images have roughly the same mean squared error values with respect to the original image, but very different quality. SSIM gives a much better indication of image quality.
Credit: Zhou Wang, Alan C. Bovik, Hamid R. Sheikh and Eero P. Simoncelli
Images credited to the National Science Foundation, a federal agency, are in the public domain. The images were created by employees of the United States Government as part of their official duties or prepared by contractors as "works for hire" for NSF. You may freely use NSF-credited images and, at your discretion, credit NSF with a "Courtesy: National Science Foundation" notation.
Additional information about general usage can be found in Conditions.
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