Average Dithering |
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The Average Dithering is a basic two-level algorithm for halftone image. It consists in choosing a certain constant gray level, in particular the average value of image pixels, and using it as a global threshold in deciding whether a pixel should be quantized to 0 or to 1. All pixels whose intensity level lies above the average value (the threshold) are quantized to 1; all others get a value of 0. This method is simple to implement but it has a disadvantage: quantization contouring is quite perceptible. Exemplifying:
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