Patent ID: 8666183
Filing Date: 2014-03-04
Classification: G06T,H04N

Abstract:
1. A method for transcoding an input image into an output image for display on a terminal having device file size and image size constraints, the method comprising: (a) extracting features of the input image including dimensions and a file size of the input image; (b) predicting, from transcoding a set of training images, a file size of the output image taking into account the constraints of the terminal and the extracted features, comprising selecting a set of feasible transcoding parameters so that a corresponding predicted file size of the output image meets the device file size constraint of the terminal; (c) determining predicted quality metric (QM) values of the output image, the predicted QM values characterizing a predicted measure of distortion of the input image introduced by transcodings, corresponding to various feasible transcoding parameters in the set of feasible transcoding parameters; the predicted QM values being determined by a comparison between the input image and corresponding output images resulting from the transcodings; the predicted QM values being further determined based on viewing conditions, comprising respective resolutions at which the input image and the corresponding output images have been scaled for determining the predicted QM values; and (d) selecting those transcoding parameters from the set of feasible transcoding parameters, which yield the highest predicted QM value, corresponding to the highest predicted visual quality for the output image for the set of feasible transcoding parameters.