Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
1991-12-02
1994-08-16
Oberley, Alvin E.
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
345 87, 345904, 324770, G09G 336
Patent
active
053390938
ABSTRACT:
The present invention makes it possible for unskilled to inspect the total surface of a liquid crystal panel accurately in short time. It is defined that a liquid crystal panel can be divided into a single part which is a constituent, isolable, and an inspectable area, and that the single part to be "unit area of image" which is defined as a pattern to be inspected. Before the inspection, a unit area of an image without defect is selected from a liquid crystal panel to be inspected. The upper limit reference pattern and the lower limit reference pattern are generated by giving the maximal brightness in a convolution and adding the predetermined brightness and by giving the minimal brightness in the convolution and subtracting the predetermined brightness, respectively, to each pixel of the convolution. Comparing a brightness of each pixel of the upper limit and the lower limit reference pattern with a brightness of a pixel of a pattern to be inspected corresponding to it, the liquid crystal panel to be inspected is judged to be up to standard when more than a predetermined number of pixels are within the range between the upper limit and the lower limit brightness of the reference pattern.
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Darwish, et al., "A Rule Based Approach for Visual Pattern Inspection", IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. 10, (1988) Jan., No. 1, New York, N.Y., pp. 56-68.
Chin, et al., "Automated Visual Inspection: A Survey", IEEE Transaction on Pattern Analysis and Machine Intelligence, vol. PAMI-4 (1982) No. 6, New York, N.Y., pp. 557-573.
Hiiro Kaoru
Kumagai Eryohei
Shimizu Harumi
Takahashi Tooru
Ezel Inc.
Oberley Alvin E.
Saras Steve
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