The performance of a printer or an imaging system using transform-based quality measures
First Claim
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1. A method for characterizing the performance of a device, comprising the following steps:
- (a) providing a printed symbol, said printed symbol having been generated with a printer, said printed symbol comprising an array of printed polygons;
(b) generating a pixel image of said printed symbol with camera;
(c) locating an imaged symbol in said image using a computer processor, wherein the imaged symbol comprises an array of imaged polygons;
(d) transforming at least a portion of said imaged symbol into a frequency domain using the computer processor;
(e) calculating a quality measure in accordance with said transformed portion using the computer processor, wherein the quality measure indicates periodic differences between the imaged polygons and an array of specified polygons; and
(f) characterizing the performance of said device in accordance with said quality measure, wherein said device is one of said printer and said camera.
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Abstract
A method and apparatus for characterizing the performance of either a printer used to print a two-dimensional symbol or an imaging system used to generate an gray-scale image of the printed symbol. After the image is generated, an acquisition target of the symbol is located. The fast Fourier transform of the gray-scale image is generated and certain hexagon-position quality measures are computed to characterize the quality of the acquisition target.
37 Citations
8 Claims
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1. A method for characterizing the performance of a device, comprising the following steps:
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(a) providing a printed symbol, said printed symbol having been generated with a printer, said printed symbol comprising an array of printed polygons; (b) generating a pixel image of said printed symbol with camera; (c) locating an imaged symbol in said image using a computer processor, wherein the imaged symbol comprises an array of imaged polygons; (d) transforming at least a portion of said imaged symbol into a frequency domain using the computer processor; (e) calculating a quality measure in accordance with said transformed portion using the computer processor, wherein the quality measure indicates periodic differences between the imaged polygons and an array of specified polygons; and (f) characterizing the performance of said device in accordance with said quality measure, wherein said device is one of said printer and said camera. - View Dependent Claims (2, 3, 4)
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5. An apparatus for characterizing the performance of a device, comprising:
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(a) a camera; and (b) a computer processor, wherein; said camera generates a pixel image of said printed symbol, said printed symbol having been generated with a printer, said printed symbol comprising an array of printed polygons; said computer processor locates an imaged symbol in said image, wherein the imaged symbol comprises an array of imaged polygons; said computer processor transforms at least a portion of said imaged symbol into a frequency domain; said computer processor calculates a quality measure in accordance with said transformed portion, wherein the quality measure indicates periodic differences between the imaged polygons and an array of specified polygons; and said computer processor characterizes the performance of said device in accordance with said quality measure, wherein said device is one of said printer and said camera. - View Dependent Claims (6, 7, 8)
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Specification