Image analysis – Histogram processing – For setting a threshold
Patent
1993-02-18
1995-01-03
Mancuso, Joseph
Image analysis
Histogram processing
For setting a threshold
382 21, 382 60, G06K 948
Patent
active
053793501
ABSTRACT:
The present invention provides an improved technique for extracting contours in an image without waiting for processing of all the scanning lines in the image. Run-data on two boundary scanning lines, each representing the boundary coordinates at which the image changes, are stored in a run-data buffer. A contour extraction unit compares two sets of the run-data with one another to extract segment vectors and detect a set of closed-loop vectors defining a contour of a image area. Three registers in a working buffer store specific data representing the relationship between a starting point and a terminal point of each vector sequence and are used in detecting closed-loop vectors. A vector data memory stores vector data including coordinate values of start and end points of closed-loop vectors. The contour extraction unit detects a vector sequence which has a starting point identical with a terminal point as a function of the data registered in the working buffer to identify the vector sequence as a closed-loop.
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Asano Tetsuo
Nakai Kazuhiro
Shimazu Shigeaki
Usui Nobuaki
Chang Jon
Dainippon Screen Mfg. Co,. Ltd.
Mancuso Joseph
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