Patent ID: 8875200
Filing Date: 2014-10-28
Classification: H04N

Abstract:
1. A method of outputting video frames while changing channels using a digital broadcast receiver, the method comprising: sequentially tuning to a plurality of channels and receiving a plurality of digital broadcast signals from the respective channels; extracting a plurality of video frames from the respective digital broadcast signals and storing the video frames; receiving a digital broadcast signal from a desired channel to be tuned upon receiving a channel change command; outputting at least one of the stored video frames before a digital broadcast signal of the desired channel is output; determining whether a video frame extracted from the digital broadcast signal of the desired channel is an intra-frame or an inter-frame; if it is determined that the extracted video frame is an intra-frame, decoding the intra-frame without reference to the stored video frames and outputting the decoded intra-frame; if it is determined that the extracted video frame is an inter-frame, decoding the inter-frame without converting the inter-frame into an intra-frame, detecting an error of the decoded inter-frame, and correcting the detected error by performing an error-concealment operation; and skipping outputting the decoded inter-frame if a degree of picture-quality degradation of the decoded inter-frame caused by the error-concealment operation is higher than a reference level.