Patent ID: 7755640

Claim:
A gamma image correction method, comprising: receiving an original image data point; retrieving p conversion values (p is larger than 2) from a memory unit according to the original image data point; and performing arithmetical operations for the p conversion values to generate an image parameter value from the original image data point after gamma image correction wherein the original image data point is represented by N bits, the memory unit contains 2 k conversion values, and N is larger than k; wherein p, N, and k are positive integers and the image parameter value is used for display; wherein p equals to 3 and the three conversion values comprise a first conversion value, a second conversion value, and a third conversion value; and wherein the memory unit stores the 2 k conversion values in a predetermined sequence and the first conversion value, the second conversion value, and the third conversion value are three conversion values successively stored in the memory unit.