Patent ID: 7577196
Filing Date: 2009-08-18
Classification: H04N

Abstract:
1. Device for coding video frame sequences, comprising first means for measuring the spatial activity of the video frames to be coded, second means for measuring the temporal activity of the video frames to be coded, means for coding the frames as a frame structure or as a field structure, said coding means being able to choose the one of the field or frame structure dynamically as a function of a quotient between the measurements of spatial and temporal activity means for determining whether the video sequences are of interlaced type or of progressive type on the basis of the measurements of spatial and temporal activity wherein, each frame comprising a first field interlaced with a second field; the first measuring means are adapted for measuring the spatial activity of the first field of a frame and representing the same by a first value, and for measuring the spatial activity of the second field of said frame and representing the same by a second value; the second measuring means are adapted for measuring the temporal activity between the first and second fields of said frame and representing the same by a third value; and for measuring the temporal activity between the first field of said frame and the second field of a previous frame and representing the same by fourth value; and the coding means are adapted to compute a weighted temporal activity as follows: where: C_intra[ C_intra[ C_T[ C_T[ max(a,b) is a function returning the maximum value between value a and value b; and min (a,b) is a function returning the minimum value between value a and value b.