Method and system for stabilizing video data
First Claim
1. A method for stabilizing video data, said method comprising the steps of:
- subdividing said video into a plurality of successive framesdividing each of said successive frames into a plurality of blocks;
determining for each block of each frame a motion vector representing the direction and magnitude of the motion in said block, said vector GMV at an instant t being called global motion vector GMV(t) and representing said motion at the instant t with respect to the previous frame;
defining a modified vector, called integrated motion vector IMV(t) at the instant t and designating the final motion vector correction to be applied to the current frame in view of its motion correction, said integrated motion vector being given by the expression;
IMV(t)=GMV(t)+a(E) . IMV(t−
1)where GMV(t) is the global motion vector of the current frame at the instant t, a(E) is a variable adaptive factor depending on an expression E and IMV(t−
1) is the integrated motion vector corresponding to the previous current frame; and
modifying the video data according to the modified integrated motion vectors defined for each successive current frame.
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Accused Products
Abstract
The invention relates to a method for stabilizing a video recording of a scene made by a video camera and represented by video data, said method comprising the steps of subdividing said video data into a plurality of successive frames themselves divided into a plurality of blocks, determining for each block of each frame a motion vector representing the direction and magnitude of the motion in said block, said vector at an instant t being called global motion vector GMV(t) and representing said motion at the instant t with respect to the previous frame, defining a modified vector called integrated motion vector IMV(t) at the instant t and designating the final motion vector correction to be applied to the current frame in view of its motion correction, said integrated motion vector being given by the expression:IMV(t) = GMV(t)+a(E). WIV(t−1) where a(E) is a variable adaptive factor depending on an expression E and IMV(t−1) is the integrated motion vector corresponding to the previous current frame, and modifying the video data according to the modified integrated motion vectors defined for each successive current frame.
13 Citations
5 Claims
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1. A method for stabilizing video data, said method comprising the steps of:
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subdividing said video into a plurality of successive frames dividing each of said successive frames into a plurality of blocks; determining for each block of each frame a motion vector representing the direction and magnitude of the motion in said block, said vector GMV at an instant t being called global motion vector GMV(t) and representing said motion at the instant t with respect to the previous frame; defining a modified vector, called integrated motion vector IMV(t) at the instant t and designating the final motion vector correction to be applied to the current frame in view of its motion correction, said integrated motion vector being given by the expression;
IMV(t)=GMV(t)+a(E) . IMV(t−
1)where GMV(t) is the global motion vector of the current frame at the instant t, a(E) is a variable adaptive factor depending on an expression E and IMV(t−
1) is the integrated motion vector corresponding to the previous current frame; andmodifying the video data according to the modified integrated motion vectors defined for each successive current frame. - View Dependent Claims (2, 3, 4)
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5. A system for stabilizing video data, said system comprising:
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a frame storage for storing a plurality of successive frames of video data of the video recording; a processor coupled to said frame storage for dividing each frame into a plurality of blocks, determining for each block of each frame a motion vector which represents the direction and magnitude of the motion in said block, said vector at an instant t being called global motion vector GMV(t) and representing said motion at the instant t with respect to the previous frame, defining a motion vector, called integrated motion vector IMV(t) at the instant t and designating the final motion vector correction to be applied to the current frame in view of its motion correction, said integrated motion vector being given by the expression
IMV(t)=GMV(t)+a(E) . IMV(t−
1)where GMV(t) is the global motion vector of the current frame at the instant t, a(E) is a variable adaptive factor depending on an expression E and IMV(t−
1) is the integrated motion vector corresponding to the previous current frame, and modifying the video data according to the modified integrated motion vectors defined for each successive current frame.
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Specification