Patent ID: 6983068

Claim:
A method for classification of an input image in natural picture or synthetic graphics classes, comprising the following steps: a) extracting one or more spatial gray-level dependence texture features from the input image; b) processing each extracted feature using an algorithm associated with the feature; c) comparing the result of each feature algorithm to one or more previously selected thresholds; d) if, according to previously determined rules, any comparison is determinative of the class of the input image, classifying the input image in either the natural picture or synthetic graphics class according to the previously determined rules, otherwise indicating the result is indeterminate, step a) includes the following steps: e) processing the input image using a low-pass filter and initializing a spatial gray-level dependence matrix to zero, in any order; f) building a spatial gray-level dependence matrix using the processed input image; and g) extracting features of the spatial gray-level dependence matrix; and wherein steps a)–g) are performed in conjunction with a variance feature, a bias feature, a skewness feature and a fitness feature of the spatial gray-level dependence matrix.