Panoramic surveillance system
DCFirst Claim
1. A panoramic imaging system for a space, said system comprising:
- a dome-like convex mirror, having a generally smoothly curved surface; and
a camera mounted relative to said mirror so that at least a major portion of the surface of the mirror is within the field of view of the camera, the camera having an aperture lens;
said mirror having an elevation gain, α
, which is greater than 3 and a profile such that said mirror reflects radiation from at least a major part of said space onto the image plane of the camera, said profile satisfying the relationship, in polar co-ordinates,
space="preserve" listing-type="equation">Sin A+0.5(1+α
)θ
!=C*r* -0.5(1+α
)!where the origin of the co-ordinates is at the actual or virtual position of the aperture lens of said camera, r is the distance of a point on the mirror profile from the origin along a direction inclined at an angle θ
with respect to the optical axis of the camera, C is a constant, and A specifies the inclination of the profile to the optical axis of the camera at the point on said dome-like mirror which is closest to the aperture lens of the camera.
1 Assignment
Litigations
0 Petitions
Accused Products
Abstract
A panoramic imaging system, for monitoring a space, comprises a single camera and a dome-like convex mirror. The camera is mounted relative to the mirror so that at least most of the surface of the mirror is within the field of view of the camera. The mirror has an elevation gain, α, greater than 3 and a profile which (a) ensures that radiation from at least most of the space is reflected by the mirror onto the image plane of the camera, and (b) satisfied the relationship, in polar co-ordinates,
Sin A+0.5(1+α)θ!=C.r. -0.5(1+α)!
where C is a constant and A specifies the inclination of the profile to the optical axis of the camera at the point on the mirror which is closest to the aperture lens of the camera. The camera may be an electronic camera having a charge coupled device (CCD) sensor at its image plane, and the processed image of the space produced by the camera may be displayed on a monitor screen as a dewarped image. A motion sensing algorithm may be included in the image processing system of the electronic camera to generate an alarm when motion is sensed in the space.
87 Citations
13 Claims
-
1. A panoramic imaging system for a space, said system comprising:
-
a dome-like convex mirror, having a generally smoothly curved surface; and a camera mounted relative to said mirror so that at least a major portion of the surface of the mirror is within the field of view of the camera, the camera having an aperture lens; said mirror having an elevation gain, α
, which is greater than 3 and a profile such that said mirror reflects radiation from at least a major part of said space onto the image plane of the camera, said profile satisfying the relationship, in polar co-ordinates,
space="preserve" listing-type="equation">Sin A+0.5(1+α
)θ
!=C*r* -0.5(1+α
)!where the origin of the co-ordinates is at the actual or virtual position of the aperture lens of said camera, r is the distance of a point on the mirror profile from the origin along a direction inclined at an angle θ
with respect to the optical axis of the camera, C is a constant, and A specifies the inclination of the profile to the optical axis of the camera at the point on said dome-like mirror which is closest to the aperture lens of the camera. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
Specification