Color rolling detection method and detection device

A color rolling detection device for an input image, comprising:

• circuitry configured to
• extract parameter values indicative of color or brightness of the image in a detection time period T3 which satisfies the relations of T3=m×T2 and T3≧T/2, wherein T2 is representative of a detection cycle within the detection time period T3, T is representative of a predetermined color rolling cycle, and m>1, and the detection cycle T2 satisfies a relation of T2<T/2;
• perform a preprocess to the extracted parameter values so as to obtain characteristic values of the image;
• obtain 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 T3;
• calculate, for each detection cycle T2 in the detection time period T3, the average value of the characteristic values in the detection cycle T2 on a time axis based on the obtained first initial value;
• and
• detect whether there exists in the detection time period T3 such a detection cycle T2 that the characteristic values within the detection cycle T2 always maintain a deviation in a certain direction relative to the average value of the characteristic values within the detection cycle T2 on the time axis, wherein if such a detection cycle T2 is detected, a detection result that color rolling occurs is obtained, and if such a detection cycle T2 is not detected, a detection result that the color rolling does not occur is obtained.

A non-transitory computer-readable medium including machine-readable instruction code, when said instruction code is read and executed by a machine, the following steps can be executed:

• an extracting step for extracting parameter values indicative of color or brightness of the image in a detection time period T3 which satisfies relations of T3=m×T2 and T3≧T/2, wherein T2 is representative of a detection cycle within the detection time period T3, T is representative of a predetermined color rolling cycle, and m>1, and the detection cycle T2 satisfies a relation of T2<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 T3;
• an average value calculating step for calculating, with respect to each detection cycle T2 within the detection time period T3, the average value of the characteristic values in the detection cycle T2 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 T3 such a detection cycle T2 that the characteristic values within the detection cycle T2 always maintains a deviation in a certain direction relative to the average value of the characteristic values within the detection cycle T2 on the time axis, wherein if such a detection cycle T2 is detected, it is judged that color rolling occurs, otherwise it is judged that the color rolling does not occur.