| 摘要 |
The invention relates to a method and apparatus for evaluating the quality of a video sequence by temporally synchronizing the encrypted input bit stream of a video decoder with the processed video sequence obtained by an external video decoder, the method comprising the steps of: a) supplying the encrypted input bit stream to an analysis module; b) analysing, in the analysis module, the packet header information of the encrypted input bit stream, and calculating the size and the type of the pictures contained in the bit stream; c) extracting, on the basis on the calculated picture sizes and types, features that are representative of the content depicted in the video pictures; d) extracting the type of content and respective features representative of the content from the pictures of the processed video sequence; e) comparing the features extracted in step d) from the current picture of the processed video sequence with the features extracted in step c) from the analysed pictures to compute the part of the bit stream that corresponds to the current PVS; f) wherein the part of the bit stream which corresponds to the current PVS is further input to a video quality assessment module; and g) estimating, by the video quality assessment module, a subjective quality score based on the obtained information from the bit stream and the processed video sequence. |
