1. A method of enhancing a still digital image extracted from a compressed video sequence, said compressed video sequence comprising at least one I-frame and at least one P-frame, said method comprising: determining whether an I-frame or a P-frame of video has been extracted; determining the quantization matrix of the previous I-frame if a P-frame has been extracted; reconstructing the extracted video frame enhancing the image based on the quantization matrix if the present I-frame of the extracted frame is an I-frame and enhancing the image based on the quantization matrix of the previous I-frame if a P-frame has been extracted.