Image analysis – Pattern recognition – Feature extraction
Patent
1997-07-22
1999-07-06
Shalwala, Bipin
Image analysis
Pattern recognition
Feature extraction
382114, 382182, 382190, 382203, 382205, 382232, 341 57, 434114, 34082519, 4001091, G06K 952, G06K 900, G06K 918, G06K 936
Patent
active
059206497
ABSTRACT:
Light is obliquely irradiated onto the surface of a document in braille, and its reflected light is received, to obtain a first gray image. The first gray image is subjected, while being scanned in a direction corresponding to a direction parallel to the direction of light irradiation, to differentiation processing in the scanning direction, to produce a second gray image whose light and dark portions respectively produced by projected points have a particular pattern. The second gray image is subjected to such ternary-coding processing that the particular pattern of the light and dark portions respectively produced by the projected points in the second gray image is emphasized, to produce a ternary-coded image. Each of the projected points is extracted by pattern matching with respect to the ternary-coded image.
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Enomoto Mitsunobu
Yasuda Naotaka
Sanyo Electric Co,. Ltd.
Shalwala Bipin
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