Image analysis – Image enhancement or restoration – Intensity – brightness – contrast – or shading correction
Reexamination Certificate
2002-10-03
2008-11-25
Bella, Matthew C. (Department: 2624)
Image analysis
Image enhancement or restoration
Intensity, brightness, contrast, or shading correction
C348S362000
Reexamination Certificate
active
07457476
ABSTRACT:
An optical sensor device has an illuminating light source and an image sensor. The image sensor captures a sequence of images under exposure of light from the light source. A controller in the optical sensor device has a control output and generates an exposure time control signal on the control output. The controller includes an exposure time control loop. Each iteration of the loop includes the steps: calculating an error between a set value and an actual luminance condition value determined in a current image in the sequence of images; calculating a current exposure time as a function of the error and an exposure time calculated during the preceding iteration of the control loop; and generating the exposure time control signal on the control output based on the current exposure time. The exposure time may thereby be determined so as to yield optimum contrast in an image which is to be captured by the image sensor.
REFERENCES:
patent: 5223935 (1993-06-01), Tsuji et al.
patent: 5661506 (1997-08-01), Lazzouni et al.
patent: 5702059 (1997-12-01), Chu et al.
patent: 5764611 (1998-06-01), Watanabe
patent: 5831254 (1998-11-01), Karpen et al.
patent: 5852434 (1998-12-01), Sekendur
patent: 6270013 (2001-08-01), Lipman et al.
patent: 0602637 (1994-06-01), None
patent: WO 97/05560 (1997-02-01), None
patent: WO 01/16691 (2001-03-01), None
patent: WO 01/26032 (2001-04-01), None
patent: WO 01/26033 (2001-04-01), None
patent: PCT/SE02/01244 (2002-10-01), None
HIR204 From Everlight Electronics Co, Ltd, No. 25 Land 76, sec 3, Chung Yang Rd., Ticheng 236, Tapei, Taiwan.
Intelligent Paper, Marc Dymetman and Max Copperman, Xerox Research Centre Europe, pp. 392-406, XP-002328425.
Tim Wescott, PID Without a PhD, Embedded Systems Programming, Miller Freeman, San Francisco, CA, US, 2000, pp. 86-108.
Anoto AB
Bella Matthew C.
Birch, Stewart, Kolasch and Birch LLP
Tucker Wesley
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