Image analysis – Pattern recognition – Feature extraction
Patent
1995-11-07
1999-07-06
Chang, Jon
Image analysis
Pattern recognition
Feature extraction
382269, G06K 948
Patent
active
059206489
ABSTRACT:
At step 1 in the flowchart of FIG. 1, multi-valued image data representing an image are read. After the image data are sliced at luminance values of 0 through 255 at step 2, boundary contours are extracted from the image data at step 3. Each boundary contour is converted to an inclined vector contour through an inclined vector process, which is executed according to predetermined conditions at step 4. The inclined vector contour undergoes a desired transformation of coordinates at step 5 before an orthogonal process, which is executed at step 6 to re-convert the inclined vector contours having transformed coordinates to outer and inner boundary contours. At step 7, the CPU (110) fills between the outer boundary contour and the inner boundary contour to generate image data of a closed figure, and combines a plurality of image data in the order of luminance values to generate multi-valued image data. A resulting image is then recorded at step 8 based on the multi-valued image data. The image processing method of the invention allows the resolution of a processed image after transformation of coordinates to be independent of the resolution of an input device and to be maintained at substantially the same level as the resolution of an original image.
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Chang Jon
Dainippon Screen Mfg. Co,. Ltd.
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