Method and Device for Stabilising Images Supplied by a Video Camera
First Claim
1. A method of stabilizing images obtained by a controllable video camera (1) of an environment that has a given three-dimensional frame of reference associated therewith and in which objects (4) can move on preferred lanes (5), the method being characterized in that it consists:
- in a first stage;
in determining, in relatively stable first images (20) obtained by the controllable camera, first portions (21) that correspond to the preferred movement lanes (5) for said objects (4);
then in determining in said first images, by a differential process, remaining second portions (22) that are complementary to the first portions; and
then in determining, in said remaining second portions (22), the reference position of the image point (Pi) corresponding to a first stationary object point (Po) belonging to said environment (3), said first stationary object point having brightness different from the brightness of the zone of the environment that surrounds it; and
in a second stage following the first;
in determining in at least one second image (30) taken by the controllable camera (1) after said first images (20), the vector (Vd) corresponding to the movement of said image point relative to its reference position determined with said first images; and
in processing the second image (30) output by the controllable camera as a function of the modulus and the direction of said vector (Vd) in such a manner that relative to said three-dimensional frame of reference associated with the environment, said image point (Pi) returns to its reference position.
1 Assignment
0 Petitions
Accused Products
Abstract
Method and device for stabilizing images obtained by a video camera of an environment with objects moving along lanes. The method a first stage of determining in first images obtained by the camera, portions corresponding to the movement lanes, determining the remaining second portions complementary to the first portions, determining, in the second portions, the reference position of the image point corresponding to a first stationary object point, and a second stage of determining in at least one second image taken after the first images, the vector that corresponds to the movement of the image point relative to its reference position determined by the first images, and processing the second image as a function of the modulus and direction of the vector such that, relative to the three-dimensional frame of reference the image point returns to its reference position.
-
Citations
5 Claims
-
1. A method of stabilizing images obtained by a controllable video camera (1) of an environment that has a given three-dimensional frame of reference associated therewith and in which objects (4) can move on preferred lanes (5), the method being characterized in that it consists:
-
in a first stage;
in determining, in relatively stable first images (20) obtained by the controllable camera, first portions (21) that correspond to the preferred movement lanes (5) for said objects (4);
thenin determining in said first images, by a differential process, remaining second portions (22) that are complementary to the first portions; and
thenin determining, in said remaining second portions (22), the reference position of the image point (Pi) corresponding to a first stationary object point (Po) belonging to said environment (3), said first stationary object point having brightness different from the brightness of the zone of the environment that surrounds it; and
in a second stage following the first;
in determining in at least one second image (30) taken by the controllable camera (1) after said first images (20), the vector (Vd) corresponding to the movement of said image point relative to its reference position determined with said first images; and
in processing the second image (30) output by the controllable camera as a function of the modulus and the direction of said vector (Vd) in such a manner that relative to said three-dimensional frame of reference associated with the environment, said image point (Pi) returns to its reference position. - View Dependent Claims (2, 3, 4, 5)
-
Specification