1. A method for steganalysis of an image, comprising: generating a prediction-error image from a gray-scale image corresponding to the image; computing at least one discrete wavelet transform (DWT) of at least one image selected from the group consisting of the gray-scale image and the prediction-error image; computing moments for multiple sub-bands associated with the at least one DWT, wherein computing moments is based on histograms of the multiple sub-bands; using the moments to provide input features for one or more classifiers configured to detect changes in the histograms that indicate if there is hidden data in the image.