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Method for Detecting Cursor

IP.com Disclosure Number: IPCOM000044587D
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-06

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Fujisawa, H [+details]


This article describes the precise detection of slidably mounted white cursors on a black background level, by counting the total black bits in each of the small areas of the cursor, summing the counts of three successive small areas, and comparing the summed counts with a threshold value. Such cursors are mounted on the side of a document glass platen of a document scanner to specify a partial area of the document to be scanned. The figure shows two cursors CL and CR, which are slidably mounted, in parallel with the scan direction, on the black background color. The cursors are white colored, and sometimes, black dust or other material deposits on the white cursors, resulting in a decrease of reliability of the cursor detection. The algorithm in this article solves this problem.