| 摘要 |
Contour line data is easily extracted from line drawing data (binary image data). Run data representative of a line drawing compressed according to run-length coding is read line by line, and run data connected to a preceding line is inspected. The run data is divided into blocks in each of which present and preceding lines of run data are connected to each other in one-to-one correspondence, based on an inspected result. Connection information between the blocks of run data is added to the blocks, and the blocks of run data and the connection information are managed as run block data. Left-hand coordinates of the run block data are traced downwardly, and right-hand coordinates of the run block data are traced upwardly for thereby extracting coordinate data (contour line data).
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