ABSTRACT An image determining apparatus for determining adot matrix image or a character/line picture on the basisof a halftone image signal obtained by scanning anoriginal image including a dot matrix image or acharacter/line picture. In order to perform such imagedetermination, first, a pixel block corresponding to atwo-dimensional region of a predetermined area isextracted from the halftons image signal, the averagepixel density of the extracted pixel block are binarizedusing the calculated average pixel density as a densitythreshold. The binarized pixel block is accessedsequentilly in the main scan and subscan directions tocheck the length and frequency of occurrence of runs of aparticular color pixel. If the length and frequency ofoccurrence of these runs are in a predeterminedrelationship, it is determined that the pixel blockconcerned is a dot matrix image or a character/linepicture.

Title
Methode et appareil danalyse dimages
Image determining method and apparatus
Application Number
612109
Publication Number
1315700
Application Date
September 20, 1989
Publication Date
April 6, 1993
Inventor
Nannichi Toshihiko
Agent
MARKS & CLERK
Assignee
Kabushiki Kaisha Toshiba
IPC
G06F 15/70
H04N 01/40
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