Video image coded data display method, device, and communications system

摘要

The present invention relates to a displaying method for video image coded data which prevents deterioration of image quality of a video image as much as possible, and conceals, from an observer, deteriorated video quality caused due to a transmission error. The displaying method selects target image frames to be decoded and target image frames to be discarded, by performing error determination (32) in parallel with an error recovery process and other image restoration processes, and decodes (33) only the selected target image frames. A predetermined display device sequentially displays (34) only the decoded target image frames while adjusting a frame rate.

主权项

1. A displaying method for video image coded data which is configured by coded data of a plurality of compressed image frames each configured by a plurality of types of hierarchical scalabilities and distributed through predetermined transmission means, the method comprising:
a receiving step of sequentially receiving the coded data of the plurality of image frames through the transmission means; an error determination step of calculating a missing data rate of missing data caused due to a transmission error, for the coded data of each of the scalabilities included in target image frames, which are to be displayed per unit time and disposed at a predetermined frame interval, from among the received image frames, and then searching, from among the received target image frames, a target image frame which has data quality deteriorated to a certain level or lower, the certain level being defined by a result of the calculation of the missing data rate and continuity of the received coded data; a destruction determination step of determining re-transmission or discard for a deteriorated target image frame which is found in the error determination step; a destruction step of discarding, from among the received target image frames, a deteriorated target image frame to be discarded which is determined in the destruction determination step; a decoding step of decoding only the coded data of the target image frames remained from among the received target image frames; an adjusting step of adjusting a frame rate on the basis of the number of the target image frames remained from among the received target image frames; and a display step of causing a predetermined display device to display the target image frames decoded in the decoding step, according to the adjusted frame rate.