Braille recognition system with ternary-coding
First Claim
1. A braille recognition system comprising:
- imaging means for obliquely irradiating light onto the surface of a document in braille and receiving its reflected light, to obtain a first gray image; and
projected point extracting means for extracting each of projected points on the surface of said document in braille on the basis of said first gray image,said projected point extracting means comprisingdifferentiating means for subjecting, while scanning the first gray image in a direction corresponding to a direction parallel to the direction of light irradiation, said first gray image to differentiation processing in the scanning direction, to produce a second gray image whose light and dark portions respectively produced by the projected points have a particular pattern,ternary-coding processing means for subjecting said second gray image 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, andpattern matching processing means for extracting each of the projected points by pattern matching with respect to said ternary-coded image.
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Accused Products
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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Citations
8 Claims
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1. A braille recognition system comprising:
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imaging means for obliquely irradiating light onto the surface of a document in braille and receiving its reflected light, to obtain a first gray image; and projected point extracting means for extracting each of projected points on the surface of said document in braille on the basis of said first gray image, said projected point extracting means comprising differentiating means for subjecting, while scanning the first gray image in a direction corresponding to a direction parallel to the direction of light irradiation, said first gray image to differentiation processing in the scanning direction, to produce a second gray image whose light and dark portions respectively produced by the projected points have a particular pattern, ternary-coding processing means for subjecting said second gray image 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, and pattern matching processing means for extracting each of the projected points by pattern matching with respect to said ternary-coded image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification