Image analysis – Image enhancement or restoration – Variable threshold – gain – or slice level
Patent
1995-01-31
1996-08-06
Couso, Jose L.
Image analysis
Image enhancement or restoration
Variable threshold, gain, or slice level
G06K 938
Patent
active
055442404
ABSTRACT:
An image processing apparatus comprises a first memory for storing a plurality of data words corresponding to different pixels of a test image, each data word being set to a common test data value. The data words are converted into one or more analog video signals using an digital to analog convertor. The one or more video signals are converted, using an analog to digital convertor, into captured data values with each captured data value corresponding to a different one of the data words stored in the first memory. The captured data values are stored in a second memory and averaged to generate a mean captured value. Any difference between the mean captured value and the test data value is determined to identify any amplification error in the captured data values. First and second tolerance values are set to be respectively greater than and less than the mean captured value. The captured data values between the first and second tolerance limits are then counted to identify any quantization errors in the captured data values.
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Couso Jose L.
International Business Machines - Corporation
LaBaw Jeffrey S.
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