Image analysis – Pattern recognition – Feature extraction
Patent
1995-12-27
1998-10-06
Rogers, Scott
Image analysis
Pattern recognition
Feature extraction
382261, 382275, 358463, G06K 940, G06T 500, H04N 1409
Patent
active
058189645
ABSTRACT:
A device and method for filtering out the noise generated due to coding of image data signals. The device has a threshold determining unit, a binary index unit, a filter selecting unit, and an adaptive filtering unit. The threshold determining unit 4 divides each pixel of the input image data into two gray levels. The binary indexes defined by the gray level are checked by a window with a prescribed size. If the region in the window is determined to be a homogeneous region, a heterogeneous region, or an impulse noise region (block 5), the filter selecting unit selects a filter corresponding to the determined region, and the image data is processed by the selected filter.
REFERENCES:
patent: 5245445 (1993-09-01), Fujisawa
patent: 5333211 (1994-07-01), Kanda et al.
patent: 5408337 (1995-04-01), Kanda
Donaldson Richard L.
Kempler William B.
Laws Gerald E.
Rogers Scott
Texas Instruments Incorporated
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