Patent ID: 8311358

Claim:
A method for extracting an image texture signal, comprising the steps of: (a) extracting a first image signal, the first image signal is formed by the multiplication product of a first low-frequency illuminance signal and a first high-frequency texture signal; (b) obtaining a second image signal by applying a first operation procedure to the first image signal, the second image signal comprising a second low-frequency illuminance signal and a second high-frequency texture signal, wherein the intensity of the second low-frequency illuminance signal is lower than the intensity of the first low-frequency illuminance signal and the intensity of the second high-frequency texture signal is not lower than the intensity of the first high-frequency texture signal; (c) obtaining a third image signal by applying a second operation procedure to the second image signal, the third image signal having a third high-frequency texture signal, wherein the intensity of the third high-frequency texture signal is not lower than the intensity of the second high-frequency texture signal, the third high-frequency texture signal further comprising a first noise signal; (d) obtaining a fourth image signal by applying a third operation procedure to the third image signal, the fourth image signal having a fourth texture signal, the fourth texture signal further comprising a second noise signal, wherein the intensity of the second noise signal of the fourth texture signal is lower than the intensity of the first noise signal of the third high-frequency texture signal; and (e) outputting the fourth image signal, whereby the first image signal is transformed through the method for extracting the image texture signal to become an extracted texture signal, wherein the fourth image signal is thereby defined as the extracted texture signal.