| histogram | 1. A graphic columnar or bar representation to compare the magnitudes of frequencies or numbers of items. 2. Graphical representation of the frequency distribution of a variable, in which rectangles are drawn with their bases on a uniform linear scale representing intervals, and their heights are proportional to the values within each of the intervals. Origin: histo-+ G. Gramma, a writing (05 Mar 2000) |
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| gray level histogram | <microscopy> In digital image processing, a histogram that depicts the number of pixels at each gray value. The histogram can be used to measure the areas that have given ranges of gray values or to adjust image contrast by histogram stretching or equalisation. See: Image histogram. (05 Aug 1998) |
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