1. A computerized system, comprising: one or more processors; and a memory storing one or more programs for execution by the one or more processors, the one or more programs including: a dividing unit operable that divides a video into a plurality of segments; a feature extracting module that extracts a set of features of each segment, wherein the set of features comprises a color variable feature, a movement variable feature, a background variable feature, and a movement ratio variable feature; and a calculating module that calculates a set of factors of each segment according to the set of features of each segment, calculates an abnormal value of each segment based on the set of factors of each segment, and determines one or more abnormal segments of the video according to the abnormal value of each segment; wherein the feature extracting module further calculates a background variable ratio of each segment while the background variable ratio is a ratio of the factor corresponding to the background variable feature and the factor corresponding to the movement variable feature; and the abnormal value is calculated based on the background variable ratio and the factors corresponding to the color variable feature, the movement variable feature and the movement ratio variable ratio feature, and the movement ratio variable feature is extracted based on a number of times that a rate of change between each two continuous frames of a segment has exceeded a predetermined threshold.