Patent ID: 8270739
Filing Date: 2012-09-18
Classification: G06T,H04N

Abstract:
1. A method for selecting transcoding parameters and transcoding an input image into an output image for a terminal having terminal constraints including a maximum device file size, the method comprising: (a) determining a file size, and an encoding quality factor QF(I) of the input image; (b) providing an array of relative file size prediction values and predicted quality metric values characterizing a measure of distortion of an image introduced by transcoding, the array being indexed by encoding quality factor QF(I), output encoding quality factor QFT and a resolution scaling factor zT; (c) computing a maximum relative file size as the maximum device file size divided by the file size of the input image; (d) selecting, from the array, a set of feasible transcoding parameters, yielding those predicted relative file size values not exceeding the maximum relative file size, which correspond to the file size and the encoding quality factor QF(I) of the input image; (e) obtaining, from the array, predicted quality metric values corresponding to the set of feasible transcoding parameters; and (f) selecting those transcoding parameters from the set of feasible transcoding parameters, which yield the highest predicted quality metric value.