Device and method for sub-band decomposition of image signals
00000000000000000000000000000A device that receives and processes an image signal for sub-band decomposition of an image includes a first median filter that receives the image signal and processes signal values of pixel locations (x, y), (x−1, y), (x+1, y), (x, y−1) and (x, y+1) of the image signal...
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| Main Author | |
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| Format | Patent |
| Language | English |
| Published |
20.02.2007
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| Online Access | Get full text |
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| Summary: | 00000000000000000000000000000A device that receives and processes an image signal for sub-band decomposition of an image includes a first median filter that receives the image signal and processes signal values of pixel locations (x, y), (x−1, y), (x+1, y), (x, y−1) and (x, y+1) of the image signal to provide a first median filter output signal. A second median filter receives the first median filter output signal and processes signal values at pixel locations (x, y), (x−2, y), (x+2, y), (x, y−2) and (x, y+2) of the first median output signal to provide a second median filter output signal. A third median filter receives the second median filter output signal and processes signal values at pixel locations (x, y), (x−3, y), (x+3, y), (x, y−3) and (x, y+3) of the second median filter output signal to provide a third median filter output signal. A first summer computes the difference between the image signal and the first median filter output signal to provide a first sub-band signal. A second summer computes the difference between the first median filter output signal and the second median filter output signal to provide a second sub-band signal, while a a third summer computes the difference between the second median filter output signal and the third median filter output signal to provide a third sub-band signal. |
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