Evaluating images
First Claim
1. An evaluation method, comprising:
- receiving a reference pattern corresponding to an output pattern over a network, wherein the output pattern is printed on a medium based on the received reference pattern;
rendering a scan based instance of the output pattern, wherein the rendered scan based instance comprises;
a set of features at least corresponding to the printed output pattern; and
zero or more defect features in addition to the set of features at least corresponding to the printed output pattern, the zero or more defect features comprising zero or more printed defect features;
computing a difference image based on a comparison of the rendered scan based instance to the received reference pattern, the computed difference image comprising the zero or more defect features of the rendered scan based instance; and
evaluating the computed difference image upon the zero or more defect features comprising at least one defect feature in relation to a proximity of at least one feature to a location of one or more picture elements of the received reference pattern.
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Abstract
A method for evaluating an output pattern printed on a medium is described. A reference pattern is stored. The output pattern is printed on the medium based correspondingly on the stored reference pattern. A scan based instance of the output pattern is rendered, which has a set of features at least corresponding to the printed output pattern and zero or more features additional thereto. A difference image, having the zero or more features of the rendered scan instance, is computed based on a comparison of the rendered scan instance to the stored reference pattern. Upon the zero or more features including at least one feature, the computed difference image is evaluated in relation to a proximity of at least one feature to locations pixels of the reference pattern.
448 Citations
20 Claims
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1. An evaluation method, comprising:
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receiving a reference pattern corresponding to an output pattern over a network, wherein the output pattern is printed on a medium based on the received reference pattern; rendering a scan based instance of the output pattern, wherein the rendered scan based instance comprises; a set of features at least corresponding to the printed output pattern; and zero or more defect features in addition to the set of features at least corresponding to the printed output pattern, the zero or more defect features comprising zero or more printed defect features; computing a difference image based on a comparison of the rendered scan based instance to the received reference pattern, the computed difference image comprising the zero or more defect features of the rendered scan based instance; and evaluating the computed difference image upon the zero or more defect features comprising at least one defect feature in relation to a proximity of at least one feature to a location of one or more picture elements of the received reference pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system, comprising:
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a scanner operable for receiving a reference pattern corresponding to an output pattern over a network and rendering a scan based instance of the output pattern, wherein the rendered scan based instance comprises; a set of features at least corresponding to the printed output pattern; and zero or more defect features in addition to the set of features at least corresponding to the printed output pattern, the zero or more defect features comprising zero or more printed defect features; and one or more image processors operable for; computing a difference image based on a comparison of the rendered scan based instance to the received reference pattern, the computed difference image comprising the zero or more defect features of the rendered scan based instance; and evaluating the computed difference image upon the zero or more defect features comprising at least one defect feature in relation to a proximity of at least one defect feature to a location of one or more picture elements of the received reference pattern. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A method, comprising:
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receiving a reference pattern corresponding to an output pattern printed on a medium; scanning the printed output pattern to determine (i) a set of features of the printed output pattern and (ii) zero or more printed defect features of the printed output pattern; computing a difference image by comparing the scanned, printed output pattern to the received reference pattern, the computed difference image comprising the zero or more printed defect features; and evaluating the computed difference image if the zero or more printed defect features comprise at least one printed defect feature in proximity to at least one feature of one or more picture elements of the received reference pattern. - View Dependent Claims (20)
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Specification