Registers – Coded record sensors – Particular sensor structure
Patent
1993-09-15
1994-12-13
Pitts, Harold
Registers
Coded record sensors
Particular sensor structure
235384, 235472, 235494, G06K 710
Patent
active
053731476
ABSTRACT:
An apparatus and method for reading, at high speed and with high precision, an angle of an angular modulation bar code directly from a multilevel brightness image of the bar code without the need for subjecting the image to preprocessing, such as binarization (conversion to a black-and-white image). The apparatus includes: means for dividing a multilevel brightness image of a bar code into a plurality of small sampling regions having the same area; means for detecting a maximum brightness value and a minimum brightness value among brightness values of pixels in each of the small sampling regions; means for setting a measurement origin and a threshold of light and dark in each of the small regions on the basis of the maximum and minimum brightness values; means for measuring a length from the measurement origin to a point where the brightness of the pixel reaches the threshold of light and dark in each of the small regions; means for accumulating, for each direction, length values measured in all the small regions, and for judging a direction having a maximum accumulated length value to be the bar code direction.
REFERENCES:
patent: 5276315 (1994-01-01), Surka
Aker David
International Business Machines - Corporation
Pitts Harold
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