Patent ID: 7826736

Claim:
A camera comprising: a first imaging part for capturing infrared (IR) image data of a first field of view, said first imaging part comprising IR optics; a second imaging part for capturing visible light data of a second field of view at least partially overlapping the first field of view, said second imaging part comprising visible light optics; a laser pointer for providing a laser dot in the second field of view; a memory unit having stored therein a relationship between a distance d between the laser dot and a fixed point in a visible light image of an object provided by the second imaging part and a distance z between the camera and the object, wherein said relationship comprises a first parameter dependent on the distance between the laser pointer and the optical system of the visible light optics and a second parameter dependent on the angle between the optical axes of said laser pointer and said optical system of the visible light optics; a processor arranged to determine the distance z based at least in part on the distance d, using the stored relationship; and a motor for adjusting at least one of the first field of view and the second field of view relative to each other based at least in part on the distance z determined by the processor.