Image analysis – Image enhancement or restoration – Variable threshold – gain – or slice level
Reexamination Certificate
2005-01-11
2005-01-11
Johns, Andrew W. (Department: 2621)
Image analysis
Image enhancement or restoration
Variable threshold, gain, or slice level
C382S124000
Reexamination Certificate
active
06842542
ABSTRACT:
The sensor is provided for the capacitive acquisition of images, in particular fingerprint images. The capacitors assigned to each pixel are supplemented by reference electrodes which are capacitively coupled to one another with coupling capacitances. Parallel acquisition of the image with the measuring electrodes and the additional reference electrodes yields, on the one hand, an image subdivided in accordance with the grid, and, on the other hand, local averaging resulting from the capacitive coupling is performed, which is used as a local reference value.
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Stefan Jung et al.: “A Low Power and High-Performance CMOS Fingerprint Sensing and Encoding Architecture”,ESSCIRC '98, pp. 324-327.
Alavi Amir
Johns Andrew W.
Mayback Gregory L.
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