Method and apparatus to process drawing images

Details Method and apparatus to process drawing images Method and apparatus to process drawing images

1996-10-24

1999-08-31

Boudreau, Leo H.

Image analysis

Pattern recognition

Feature extraction

382159, 382181, 382187, 382190, 382209, 382217, 382218, 382221, 382222, 348241, 348246, 348248, G06K 946

Patent

active

059464151

ABSTRACT:
The processing time and memory in converting scanned images to a hardware scription language is significantly reducer by using a "peephole" method to examine only partial images of features of the scanned image that is to be converted. The present method generated minimized feature templates (MFTs) by systematically removing all non-feature image pixels. In particular, the method and apparatus of the present invention establishes pattern estimates from image samples, eliminates unnecessary image pixels using off-line statistical analysis, and extracts feature templates from the larger size image patterns. Pattern recognition is then conducted by processing a few pixels of the unknown image pattern. An application of this technique is to recognize drawing symbols, such as, AND, NAND, OR, NOR, XOR, and XNOR gates, buffers, inverters, registers, and I/O pins from scanned images of electronic drawings.

REFERENCES:
patent: 3609686 (1971-09-01), Savory et al.
patent: 4541114 (1985-09-01), Rutenbar et al.
patent: 4773099 (1988-09-01), Bokser
patent: 4949388 (1990-08-01), Bhaskaran
patent: 5572437 (1996-11-01), Rostoker et al.
patent: 5751850 (1998-05-01), Rindtorff

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