05208667 is referenced by 29 patents and cites 7 patents.

In, for example, a motion compensated video standards converter wherein blocks in a first field or frame of a video signal are each compared with a plurality of blocks in the following field or frame of the video signal for deriving motion vectors representing the motion of the content of respective blocks between the first field or frame and the following field or frame, and wherein a correlation surface is generated for each block in the first field or frame, the correlation surface representing the difference between the content of the first block in the first field or frame and the content of each block in the following field or frame with which it has been compared; the minimum difference represented by the correlation surface and differing from the next smallest difference represented by the correlation surface by more than a predetermined threshold value is found to derive a motion vector, the number of motion vectors so derived is averaged (62) over a predetermined number of fields or frames, and the threshold value is varied (67, 68, 69) in dependence on the average.

Title
Motion compensated video standards converter and method of deriving motion vectors
Application Number
7/713988
Publication Number
5208667
Application Date
June 12, 1991
Publication Date
May 4, 1993
Inventor
Nicholas I Saunders
Basingstoke
GB
Agent
Alvin Sinderbrand
William S Frommer
Assignee
Sony Broadcast & Communications
GB
IPC
H04N 7/12
H04N 7/18
H04N 7/01
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