| 摘要 |
PURPOSE:To make it possible to discriminate points inside of a boundary line without referring to link relation among boundary points for each line independently. CONSTITUTION:Drum 2 with stuck picture original 3 is turned and irradiated with light source 4 to scan the original by scanner 5, whose photoelectric conversion output is converted by A/D converter 6, and density information on each picture element, namely, the conversion output is written to memory unit 1. By reading out the density information from memory unit 7, boundary tracing circuit 7 traces respective picture elements on the boundary line clockwise, for example, and then writes X and Y coordinates of each picture element on the boundary line to memory unit 8. Coordinates of a picture element are X and Y cooedinates of a picture element of each picture of that kind. As for the tracing of the boundary line, the scanner makes sequential scans in respective directions (d1) to (d8) in the figure to decide whether or not there is a black picture element adjoining to each black picture element and when the 1st picture element is found, the center of the scan is moved to the next picture element for the repetition of a similar scan. The boundary line is traced by the above-mentioned scan. |
