Standard test image
A standard test image is a digital image file used across different institutions to test image processing
Image processing
In electrical engineering and computer science, image processing is any form of signal processing for which the input is an image, such as a photograph or video frame; the output of image processing may be either an image or, a set of characteristics or parameters related to the image...

 and image compression
Image compression
The objective of image compression is to reduce irrelevance and redundancy of the image data in order to be able to store or transmit data in an efficient form.- Lossy and lossless compression :...

 algorithms. By using the same standard test images, different labs are able to compare results, both visually and quantitatively. 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.

Common test images

The standard size of the images are usually 512x512 or 720x576. Most of these images are freely available as TIFF
Tagged Image File Format
TIFF is a file format for storing images, popular among graphic artists, the publishing industry, and both amateur and professional photographers in general. As of 2009, it is under the control of Adobe Systems...

 files from the University of Southern California
University of Southern California
The University of Southern California is a private, not-for-profit, nonsectarian, research university located in Los Angeles, California, United States. USC was founded in 1880, making it California's oldest private research university...

's Signal and Image Processing Institute. Kodak has released a set of 24 768×512 images, available as PNGs, that are widely used for comparing image compression techniques.

External links

  • The USC-SIPI Image Database — A large collection of free standard test images
  • Computer Vision website — A large collection of links to various test images
  • A Few Test Images — Collection of various test images
  • Vision @ ReadingUniversity of Reading
    University of Reading
    The University of Reading is a university in the English town of Reading, Berkshire. The University was established in 1892 as University College, Reading and received its Royal Charter in 1926. It is based on several campuses in, and around, the town of Reading.The University has a long tradition...

    's set of popular test images
  • CIPR still images — Some sets of test images at Rensselaer Polytechnic Institute
    Rensselaer Polytechnic Institute
    Stephen Van Rensselaer established the Rensselaer School on November 5, 1824 with a letter to the Rev. Dr. Samuel Blatchford, in which van Rensselaer asked Blatchford to serve as the first president. Within the letter he set down several orders of business. He appointed Amos Eaton as the school's...

     (including the Kodak set)
  • True-color Kodak test images — The Kodak set in PNG format
  • Compression Database — The superset of all available (as well as taken down) corpora used for image compression, segmentation and classification, contains most of the images of the mentioned standard corpora with detailed information about relevant quantities (entropy, statistics, etc.)
  • TESTIMAGES — Large database of free images for testing image processing methods. The archive includes reference images for standard interpolation (enlargement) methods, testing scripts and calculated metrics.
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