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{{Short description|Digital image used to test image algorithms}} |
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In order to intuitively test the effects of an image-processing algorithm on a "natural picture" a number of '''test images''' are in common use in the image-processing field. These images are generally chosen because they present a range of challenges to image reconstruction algorithms, such as the reproduction of fine detail and textures, sharp transitions and edges, and uniform regions. The most famous image is the ] image, from a centerfold photograph of a 1972 Playboy model ]. |
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A '''standard test image''' is a digital image file used across different institutions to test ] and ] algorithms. By using the same standard test images, different labs are able to compare results, both visually and quantitatively. |
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The images are in many cases chosen to represent natural or typical images that a class of processing techniques would need to deal with. Other test images are chosen because they present a range of challenges to image reconstruction algorithms, such as the reproduction of fine detail and textures, sharp transitions and edges, and uniform regions. |
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== Historical origins == |
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Test images as transmission system calibration material probably date back to the original Paris to Lyon fax link. Analogue Fax equipment (and photographic equipment for the printing trade) were the largest user groups of the standardized image for calibration technology until the coming of television and digital image transmission systems. |
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== Common test image resolutions == |
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The standard ] of the images is usually 512×512 or 720×576. Most of these images are available as ] files from the ]'s Signal and Image Processing Institute.<ref></ref> ] has released 768×512 images, available as ]s, that was originally on ] with higher resolution, that are widely used for comparing image compression techniques.<ref>{{cite web | url = http://r0k.us/graphics/kodak/ | title = Kodak Lossless True Color Image Suite | author = Rich Franzen | access-date = 2007-08-13}}</ref> |
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==See also== |
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==See also== |
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* ] |
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* ] (DARPA/NIST face recognition database) |
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* ] |
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* ] |
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==References== |
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* ] |
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{{reflist}} |
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== External links == |
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== External links == |
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* - A large collection of links to various test images. |
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* — A large collection of standard test images |
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* http://www.hlevkin.com/ Collection of various test images |
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* — A large collection of links to various test images |
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* - University of Reading's set of popular test images |
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* {{Webarchive|url=https://archive.today/20121223143333/http://www.cvg.rdg.ac.uk/datasets/index.html |date=2012-12-23 }} — ]'s set of popular test images |
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* {{Webarchive|url=https://web.archive.org/web/20180320184326/http://www.cipr.rpi.edu/resource/stills/index.html |date=2018-03-20 }} — Some sets of test images at ] (including the Kodak set) |
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* — The Kodak set in ] format |
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* — Large collection of sample images designed for analysis and quality assessment of different kinds of displays (i.e. monitors, televisions and digital cinema projectors) and image processing techniques |
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{{Compression Methods}} |
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{{Standard test item}} |
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The images are in many cases chosen to represent natural or typical images that a class of processing techniques would need to deal with. Other test images are chosen because they present a range of challenges to image reconstruction algorithms, such as the reproduction of fine detail and textures, sharp transitions and edges, and uniform regions.
Test images as transmission system calibration material probably date back to the original Paris to Lyon fax link. Analogue Fax equipment (and photographic equipment for the printing trade) were the largest user groups of the standardized image for calibration technology until the coming of television and digital image transmission systems.
