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Imatest was founded by photographer/engineer Norman Koren in Boulder, Colorado in 2004 to develop software for testing digital camera image quality. Using Imatest software, a variety of image quality factors can be analyzed including Acutance (image sharpness), color response, image noise , dynamic range , tonal response, lens flare, lens ...
An image's utility or quality may be improved by cropping (to focus on the relevant portion), cleaning up scanning artifacts, correcting color balance, removing red-eye effect, or other adjustments. The caption of an image should mention such edits (e.g. introduction of false color or pseudocolor ) if a reader needs to know about them to ...
Image quality assessment is part of the quality of experience measures. Image quality can be assessed using two methods: subjective and objective. Subjective methods are based on the perceptual assessment of a human viewer about the attributes of an image or set of images, while objective methods are based on computational models that can ...
The SSIM index is a full reference metric; in other words, the measurement or prediction of image quality is based on an initial uncompressed or distortion-free image as reference. SSIM is a perception -based model that considers image degradation as perceived change in structural information, while also incorporating important perceptual ...
The Biology Image Library and the Cases Database, a database of medical case reports, [14] were closed in 2014. [15] The company also provided hosting for institutional repositories of publications based on the DSpace platform under the brand Open Repository. [16] The Open Repository activity was sold to Atmire in 2016. [17]
For color images with three RGB values per pixel, the definition of PSNR is the same except that the MSE is the sum over all squared value differences (now for each color, i.e. three times as many differences as in a monochrome image) divided by image size and by three.
The PRISMA flow diagram, depicting the flow of information through the different phases of a systematic review. PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) is an evidence-based minimum set of items aimed at helping scientific authors to report a wide array of systematic reviews and meta-analyses, primarily used to assess the benefits and harms of a health care ...
Test image of jelly beans from the USC-SIPI image database. A standard test image is a digital image file used across different institutions to test image processing and image compression algorithms. By using the same standard test images, different labs are able to compare results, both visually and quantitatively.