Camera calibration

Camera calibration technique using a calibration target — computer vision.

Embodiments herein include systems, methods and articles of manufacture for calibrating a camera. In one embodiment, a computing system may be coupled to a calibration apparatus and the camera to programmatically identify the intrinsic properties of the camera. The calibration apparatus includes a plurality of light sources which are controlled by the computer system. By selectively activating one or more of the light sources, the computer system identifies correspondences that relate the 3D position of the light sources to the 2D image captured by the camera. The computer system then calculates the intrinsics of the camera using the 3D to 2D correspondences. After the intrinsics are measured, cameras may be further calibrated to in order to identify 3D locations of objects within their field of view in a presentation area. Using passive markers in a presentation area, computing system may use an iterative process that estimates the actual pose of the camera.

BRIEF DESCRIPTION OF THE DRAWINGS(1) So that the mannerin which the above recited aspects are attained and can be understood in detail, a more particular description of embodiments of the invention, briefly summarized above, may be had by reference to the appended drawings.(2) It is to be noted, however, that the appended drawings illustrate only typical embodiments of this invention and are therefore not to beconsidered limiting of its scope, for the invention may admit to other equally effective embodiments.(3) FIG. 1 is an automated system for calibrating a camera, according to one embodiment described herein.(4) FIG. 2 is a computing system for calibrating the camera, according to one embodiment described herein.(5) FIGS. 3A-3C illustrate various calibration apparatuses, according to embodiments described herein.(6) FIG. 4 illustrates a view of a calibration apparatus from the perspective of the camera, according to one embodiment described herein.(7) FIG. 5 is a method for calculating the intrinsics of the camera, according to one embodiment described herein.(8) FIG. 6 illustrates pixel locations in a captured image corresponding to light sources, according to one embodiment described herein.(9) FIG. 7 illustrates a system for calibrating a camera using passive markers, according to one embodiment described herein.(10) FIG. 8 is a computing system for performing pose estimation, according to one embodiment described herein.(11) FIG. 9 illustrates a system for calibrati