Patent ID: 7729022

Claim:
A method for processing an image, applied to a display apparatus, wherein the image is displayed by at least one first frame f(N), and the at least one first frame f(N) is composed of a plurality of pixels, each of which respectively corresponds to an original gray level, the method comprising: calculating the amount of the original gray levels according to an original gray level difference between every adjacent two of the pixels and generating a first transfer function Fi(X) relative to the amount of the original gray levels, where i is a positive integer ranging from 1 to N; generating a Gamma curve according to the first transfer function Fi(X); and selectively adjusting the original gray levels to a plurality of adjusted gray levels according to the Gamma curve to obtain an image having enhanced contrast for display on said display apparatus; wherein the image is further displayed by a second frame f(N−1) prior to the first frame f(N), and the step of adjusting the original gray levels to the adjusted gray levels comprises: integrating the first transfer function FN(X) of the first frame f(N) into a first integral; generating a difference by subtracting the first transfer function F N−1(X) of the second frame f(N−1) from the first transfer function FN(X) of the first frame f(N) and integrating an absolute value of the difference to obtain a second integral; and adjusting the original gray levels of the first frame f(N) into the adjusted gray levels according to the first transfer function FN(X) of the first frame if a ratio of the second integral to the first integral is larger than a second predetermined value, or otherwise, adjusting the original gray levels of the first frame f(N) into the adjusted gray levels according to the first transfer function FN−1(X) of the second frame f(N−1).