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The '''back projection''' (or "project") of a histogrammed image is the re-application of the modified histogram to the original image, functioning as a look-up table for pixel brightness values.
For each group of pixels taken from the same position from all input single-channel images, the function puts the histogram bin value to the destination image, where the coordinates of the bin are determined by the values of pixels in this input group. In terms of statistics, the value of each output image pixel characterizes the probability that the corresponding input pixel group belongs to the object whose histogram is used.<ref>{{cite journal|year=2001|title=Open Source Computer Vision Library Reference Manual|url=http://www.cs.unc.edu/~stc/FAQs/OpenCV/OpenCVReferenceManual.pdf|
==Implementation==
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