Visual sensor for capturing images with different exposure periods
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United States of America Patent
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Mar 13, 2007
Grant Date -
Nov 14, 2002
app pub date -
May 9, 2002
filing date -
May 9, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A visual sensor capable of expanding a dynamic range with a little load of processing for arithmetic operations and performing a stable detection not affected by change of conditions such as ON/OFF state of projection of reference light. A multiplying parameter A (A>1) and the number N of times of image capturing are set in accordance with ON/OFF state of the reference light projection. N images are captured with a shutter speed varying by successively multiplying an initial value by (1/A). Values of density of each pixel in the captured images are summed. Values of constants B and C in equations: 1=BZmax+C; 0=BZmin+C are obtained based on the maximum value Zmax and the minimum value Zmin of the summed values of densities of all the pixels. An output value Z' of each pixel is obtained according to an equation: Z'=BZ+C, using the determined values of B and C.
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