1. A method for image/video segmentation using texture feature, adopted for segmenting an image signal into plural texture color feature regions, implemented by a computer, the method comprising the steps of: (A) receiving the image signal including plural image pixels; (B) applying a Gabor filter bank for executing a Gabor filtering process on each of the plural image pixels, and executing a value operation process on an output of the Gabor filtering process; (C) designating each of the plural image pixels with a corresponding texture feature vector based on a result of the value operation process; (D) executing a segmentation process on the image signal based on the texture feature vector designated to each of the plural image pixels, so that the image signal has plural texture feature regions; and (E) executing a re-segmentation process on the plural color feature regions included in the image signal based on a distribution of the plural texture feature regions in the image signal, so that at least one of the color feature regions includes plural texture color feature regions; wherein the image pixels located in the same texture feature region have texture feature vectors with identical group and color feature vectors with identical group, and wherein the Gabor filter bank is composed of an internal sub-band Gabor filter bank and an external sub-band Gabor filter bank.