Image analysis – Histogram processing – For setting a threshold
Patent
1989-06-01
1991-12-31
Moore, David K.
Image analysis
Histogram processing
For setting a threshold
382 1, 358101, 358106, 358107, G06K 900
Patent
active
050778064
ABSTRACT:
A machine vision analysis apparatus and method for automatically checking objects for specified characteristics. A video camera is provided for producing an analog video input signal corresponding to an area having an object therein being observed by the video camera. A video timer and synchronizer is used for coordinating synchronous operation of the machine vision apparatus. A digital-to-analog converter is also provided for converting a digital threshold gray level into an analog threshold level corresponding to said digital threshold level, wherein an upper and a lower threshold level are produced. A comparator is used for digitizing the analog video input signal into a digitized video signal based on the analog threshold gray levels, wherein the video input gray level must fall between the lower threshold gray level and the upper threshold gray level for a pixel to be digitized into an ON state. A pixel counter is used for summing the number of ON pixels in the digitized video signal within a predetermined portion of said video signal and produces a binary digital count output corresponding to the number of ON pixels. A microprocessor based digital control is used for analyzing and comparing said digital count output with expected and desired count results, and a program is provided for controlling operation of the microprocessor.
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pp. 241-254 (copy) from Gynecologic Oncology--article is entitled--Automated Quantitative Fluorescent Image Analysis of Cervical Cytology.
7 pages of article entitled--Image Analysis Combined with Quantitative Cytochemistry.
Elmerick Donald V.
Peters Richard K.
Spayer James L.
Walter Gerald E.
Accuron Corporation
Couso Jose L.
Moore David K.
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