Image-processing apparatus

Details Image-processing apparatus Image-processing apparatus

H - Electricity

04

N

354/68, 354/8

H04N 1/40 (2006.01) G06F 15/66 (1990.01)

Patent

CA 1306540

FC008 ABSTRACT OF THE DISCLOSURE An input gray-scale image is converted to a bilevel output signal by an image-processing apparatus with two binarizing circuits: one employing a uniform threshold and the other a dither matrix. The outputs of these circuits are selected for each pixel by deciding whether the pixel is a bilevel pixel or a gray-scale pixel. The decision is based on the maximum and minimum gray levels in a block of pixels centered on the pixel in question. Images having both bilevel and gray-scale parts can thus be binarized with clean reproduction of black-white edges.

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