Device and method for coding video data
First Claim
1. Device for coding video frame sequences, comprisingfirst 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;
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Abstract
The invention relates to a device for coding video frame sequences, comprising
- means (1) for measuring the spatial activity of the video frames to be coded,
- means (1) for measuring the temporal activity of the video frames to be coded,
- means (2) for coding the frames as a frame structure or as a field structure.
According to the invention, the means (2) for coding the frames as a frame structure or as a field structure are able to choose the field or frame structure dynamically as a function of the measurements of spatial and temporal activity of the said frame.
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Citations
4 Claims
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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; - View Dependent Claims (2, 3, 4)
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Specification