A technique for encoding lines and regions in engineering drawings☆

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Abstract

An improvement to a method of extracting line and region information from technical drawings is presented. A scheme for compressing this information as it is being found is also given. The encoding scheme is based on a combination of run-length codes, direction chain codes, and Huffman codes. It is efficient, requires minimal storage, and achieves favorable compression ratios. Experimental results from four typical line drawings are presented.

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This research was supported by the Control Data Corporation under grants 9571-901779 and 84V101.

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