1. A color rolling detection method for an input image, comprising: an extracting step for extracting parameter values indicative of color or brightness of the image in a detection time period T 3 which satisfies relations of T 3 =m×T 2 and T 3 >T/2, wherein T 2 is representative of a detection cycle within the detection time period T 3 , T is representative of a predetermined color rolling cycle, and m>1, and the detection cycle T 2 satisfies a relation of T 2 <T/2; a preprocessing step for performing a preprocess to the extracted parameter values, so as to obtain characteristic values of the image; an initial value setting step for obtaining a first initial value for calculating an average value of the characteristic values based on the characteristic values in an initialization time period of the detection time period T 3 ; an average value calculating step for calculating, with respect to each detection cycle T 2 within the detection time period T 3 , the average value of the characteristic values in the detection cycle T 2 on a time axis based on the obtained first initial value; and a detecting step for detecting whether there exists in the detection time period T 3 such a detection cycle T 2 that the characteristic values within the detection cycle T 2 always maintains a deviation in a certain direction relative to the average value of the characteristic values within the detection cycle T 2 on the time axis, wherein if such a detection cycle T 2 is detected, it is judged that color rolling occurs, otherwise it is judged that the color rolling does not occur.