Image analysis – Applications – Document or print quality inspection
Patent
1997-10-10
1999-12-07
Chang, Jon
Image analysis
Applications
Document or print quality inspection
382217, 348 88, 25055905, 25055906, 25055908, G06K 900, G06K 964, H04N 718, G01N 2186
Patent
active
059996366
ABSTRACT:
An apparatus and process for inspecting print material having a reference template generator circuit, a defect detector circuit for comparing a target image to a reference image and a defect rejecter circuit for determining the acceptability of the target image. The reference template generator circuit is made up of a pixel intensity range circuit, a pixel classifier circuit and a reference address circuit. Each pixel data of the target image is compared, according to the pixel classification of the pixel data, to each pixel data of the reference image. The flaw severity code is generated from the reference pixel comparison, which is then weighted and accumulated for the image area. The weighted sum of the occurrences of the flaw severity codes is compared with the user specified threshold for determining the acceptability of the test sample. Each entry of the look-up table contains a corresponding flaw severity code.
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Chang Jon
Dastouri Mehrdad
Deleault Robert R.
PrintProbe Technology, LLC
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