Device and method for sub-band decomposition of image signals

Details Device and method for sub-band decomposition of image signals Device and method for sub-band decomposition of image signals

2007-02-20

2007-02-20

Wu, Jingge (Department: 2624)

Image analysis

Image enhancement or restoration

Image filter

C382S265000, C382S254000, C358S001900

Reexamination Certificate

active

10252786

ABSTRACT:
A 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 (x0, y0), (x0−1, y0), (x+1, y0), (x0, y0−1) and (x0, y0+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 (x0, y0), (x0−2, y0), (x0+2, y0), (x0, y0−2) and (x0, y0+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 (x0, y0), (x0−3, y0), (x0+3, y0), (x0, y0−3) and (x0, y0+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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