Patent ID: 8400565

Claim:
A video scan converter for decoding an encoded video stream and then outputting the decoded stream with its scan method converted, wherein the video scan converter comprises: a decoder receives a video stream including a first coding unit, which has been obtained by compressing a pair of fields N 1 and N 2 that has come from a first frame of film video, and a second coding unit, which has been obtained by compressing a pair of a field N 3 that has also come from the first frame and a field M 1 that has come from a second frame, not the first frame, decodes the first and second coding units, and sequentially outputs the data of the respective fields N 1 , N 2 , N 3 and M 1 ; and a scan converter, which receives the data of the respective fields from the decoder and which generates and outputs a frame based on the data of associated two of those fields that have been supplied from the decoder, and wherein in outputting a frame associated with the data of the field N 3 , the scan converter generates the frame based on the data of the fields N 1 and N 2 which are obtained by decoding a coding unit which has been obtained by compressing a pair of two fields coming from a same frame without using the data of the field N 3 which is obtained by decoding a coding unit which has been obtained by compressing a pair of two fields coming from different frames from each other.