Pattern analyzer
First Claim
1. A pattern analyzer comprising:
- image pick-up means for picking up an image of a pattern at a plurality of sampling points and for producing a shade sample representing the depth of shade at each sampling point;
memory means for storing said shade signals;
classifying means for classifying said shade signals into different shade depths, with the result that a graph of the classified shade signals reaches a peak at two different shade depths;
threshold level determining means for determining a threshold level of shade depth between said two different shade depths;
comparing means for comparing said shade signals stored in said memory means with said threshold level and for producing a 1-bit binary signal for each shade signal; and
distributing means for distributing said shade signals into a plurality of paths, each path carrying shade signals from a section of said image.
1 Assignment
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Accused Products
Abstract
A pattern analyzer includes a sensor (19) for picking up an image of a pattern at a plurality of sampling points and for producing a shade signal representing the depth of shade at each sampling point. The sampled shade signals are temporarily stored in a memory (23) and, at the same time, are classified into different shade depths by a histogram forming circuit (30, 31, 32 and 33). The result of the classification is such that an amount of classified shade signals reaches a peak at two different shade depths. A threshold level determining circuit (34, 35, 36 and 37) is provided for determining a threshold level of shade depth between the two different shade depths. Also, a comparator (38, 39, 40 and 41) is provided for comparing the shade signals stored in the memory with the threshold level and for producing a 1-bit binary signal for each shade signal.
27 Citations
8 Claims
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1. A pattern analyzer comprising:
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image pick-up means for picking up an image of a pattern at a plurality of sampling points and for producing a shade sample representing the depth of shade at each sampling point; memory means for storing said shade signals; classifying means for classifying said shade signals into different shade depths, with the result that a graph of the classified shade signals reaches a peak at two different shade depths; threshold level determining means for determining a threshold level of shade depth between said two different shade depths; comparing means for comparing said shade signals stored in said memory means with said threshold level and for producing a 1-bit binary signal for each shade signal; and distributing means for distributing said shade signals into a plurality of paths, each path carrying shade signals from a section of said image. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A pattern analyzer comprising
image pick-up means for picking up an image of a pattern at a plurality of sampling points and for producing a shade signal representing the depth of shade at each sampling point, said image pick-up means being a single sensor; -
memory means for storing said shade signals; classifying means for classifying said shade signals into different shade depths, with the result that a graph of classified shade signals reaches a peak at two different shade depths; threshold level determining means for determining a threshold level of shade depth between two different shade depths; comparing means for comparing said shade signals stored in said memory means with said threshold level and for producing a 1-bit binary signal for each shade signal; an analog-to-digital converter for converting said sahde signals into digital form; addressing means for producing an address signal representing a section of said image; and distributing means for distributing said shade signals from said single sensor into a plurality of paths, each path carrying shade signals from a section of said image and having said classifying means, said threshold level determining means, and said comparing means provided therein, said plurality of paths dependent on said address signals whereby a histogram is formed for each section determined by said addressing means.
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8. A pattern analyzer comprising
image pick-up means for picking up an image of a pattern at a plurality of sampling points and for producing a shade signal representing the depth of shade at each sampling point, said image pick-up means being a single sensor; -
memory means for storing said shade signals; classifying means for classifying said shade signals into different shade depths, with the result that a graph of the classified shade signals reaches a peak at two different shade depths, said classifying means being at least one histogram forming circuit; threshold level determining means for determining a threshold level of shade depth between said two different shade depths, said threshold level determining means being at least one circuit; comparing means for comparing said shade signals stored in said memory means with said threshold level and for producing a 1-bit binary signal for each said signal, said comparing means being at least one comparator; distributing means for distributing shade signals into a plurality of paths, each path carrying shade signals from a section of said image and having said classifying means, said threshold level determining means, and said comparing means provided therein, said distributing means comprising an X-axis counter, a Y-axis counter, and a data P-ROM address; and an analog-to-digital converter for converting said shade signals into digital form.
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Specification