Image determining method and apparatus

Details Image determining method and apparatus Image determining method and apparatus

1989-09-19

1991-05-14

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358456, H04M 140

Patent

active

050161180

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 half-tone image signal, the average pixel density of the extracted pixel block is calculated, and the respective pixels of the pixel block are binarized using the calculated average pixel density as a density threshold. The binarized pixel block is accessed sequentially in the main scan and subscan directions to check the length and frequency of occurrance 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.

REFERENCES:
patent: 4403257 (1983-09-01), Hsieh
patent: 4447830 (1984-05-01), Stoffel
patent: 4587633 (1986-05-01), Wang et al.

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