Pattern discriminator
First Claim
1. In a pattern discriminator which receives scanning data obtained by scanning objects within defined window regions with a photoelectric converter of the two-dimensional scanning type, and having means for converting the scanned data into pixel binary data representing characteristics of the objects scanned by using a threshold value, and having means for evaluating the binary data in accordance with predetermined criteria and for producing an output signal indicative of said evaluation, the improvement comprising means for obtaining data which defines polygonal window regions within which scanning data is obtained, comprising:
- data input means for inputting apex data representing the location of the pixels at the apexes of at least one window polygon representing at least one desired window region;
computing means for computing coordinate data representing the coordinates of each pixel on the polygon perimeter lines connecting adjacent apexes by taking the coordinates of sequentially inputted apex data as adjacent apexes of the window polygon; and
memory means for storing the apex and coordinate data as starting and ending pixels of each polygonal window region on each scanning line of said scanning.
1 Assignment
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Accused Products
Abstract
A pattern discriminator receives scanning data obtained by raster scanning objects within predefined window regions with a photoelectric converter, converts the scanned data into pixel binary data by using a threshold value dependent upon the scanning position and window region and evaluates the binary data in accordance with predetermined criteria to produce an output signal indicative of the evaluation. Data specifying the shapes of the desired window regions approximated by polygons is obtained by specifying the apexes of the polygons and a programmed CPU computes the coordinates of each picture element or pixel on the lines connecting adjacent apexes along each window region perimeter. A memory stores the apex and coordinate data which defines the starting and ending points of each window region. Polygonal masks within each window and sub-mask polygonal window regions within each mask can be defined in a similar manner. A shifting detector and position corrector detects the amount of any positional shift of an object being scanned in relation to the position of a previously scanned reference object, and shifts the locations of the defined window regions by the amount of the positioned shift detected.
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Citations
8 Claims
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1. In a pattern discriminator which receives scanning data obtained by scanning objects within defined window regions with a photoelectric converter of the two-dimensional scanning type, and having means for converting the scanned data into pixel binary data representing characteristics of the objects scanned by using a threshold value, and having means for evaluating the binary data in accordance with predetermined criteria and for producing an output signal indicative of said evaluation, the improvement comprising means for obtaining data which defines polygonal window regions within which scanning data is obtained, comprising:
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data input means for inputting apex data representing the location of the pixels at the apexes of at least one window polygon representing at least one desired window region; computing means for computing coordinate data representing the coordinates of each pixel on the polygon perimeter lines connecting adjacent apexes by taking the coordinates of sequentially inputted apex data as adjacent apexes of the window polygon; and memory means for storing the apex and coordinate data as starting and ending pixels of each polygonal window region on each scanning line of said scanning. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification