A digital image is a rectangular array of dots, or picture elements, arranged in m rows and n columns. The expression mxn is called the resolution of the image, and the dots are called pixels (except in the cases of fax images and video compression, where they are referred to as pels). The term “resolution” is often also used to indicate the number of pixels per unit length of the image. Thus, dpi stands for dots per inch. For the purpose of image compression it is useful to distinguish the following types of images:
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© 2008 Springer-Verlag London Limited
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(2008). Image Compression. In: A Concise Introduction to Data Compression. Undergraduate Topics in Computer Science. Springer, London. https://doi.org/10.1007/978-1-84800-072-8_5
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