Image determining method and apparatus

Details Image determining method and apparatus Image determining method and apparatus

H - Electricity

04

N

178/3.1

H04N 1/40 (2006.01) G06F 15/70 (1990.01)

Patent

CA 1315700

ABSTRACT An image determining apparatus for determining a dot matrix image or a character/line picture on the basis of a halftone image signal obtained by scanning an original image including a dot matrix image or a character/line picture. In order to perform such image determination, first, a pixel block corresponding to a two-dimensional region of a predetermined area is extracted from the halftons image signal, the average pixel density of the extracted pixel block are binarized using the calculated average pixel density as a density threshold. The binarized pixel block is accessed sequentilly in the main scan and subscan directions to check the length and frequency of occurrence of runs of a particular color pixel. If the length and frequency of occurrence of these runs are in a predetermined relationship, it is determined that the pixel block concerned is a dot matrix image or a character/line picture.

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