| 主权项 |
1. A computer system, comprising:
at least one processing unit; memory operably associated with the at least one processing unit; a system for managing images generated from a movable camera that is storable in memory and executable by the at least one processing unit, the system for managing images comprising:
a background subtraction component configured to detect objects of interest that appear in a field of view of the camera, the background subtraction component including a background model to compare against incoming image frames of video generated from the camera to detect objects;a point tracker component configured to generate point motion estimates from the image frames received from the camera while the background subtraction component performs a background subtraction operation, wherein the point motion estimates are based on points obtained from the image frames that correspond with points present in previous image frames;a motion estimation component configured to determine camera motion based on the point motion estimates generated from the point tracker component, wherein the motion estimation component uses the point motion estimates to distinguish small camera motions from large camera motions in response to determining camera motion, wherein small camera motions are characterized by having a field of view of the camera largely overlap with an original field of view of the camera and large camera motions are characterized by having the field of view of the camera different from the original field of view of the camera, the motion estimation component comparing the point motion estimates to a predetermined threshold to distinguish small camera motions from large camera motions, the motion estimation component indicating small camera motions in response to determining that the point motion estimates are below the predetermined threshold and indicating large camera motions in response to determining that the point motion estimates are above the predetermined threshold, the motion estimation component further configured to estimate camera movement parameters in response to indicating large camera motions;a motion compensation component configured to provide compensation to the image frames in response to a determination that the camera has moved in small camera motions, the compensation including transforming the image frames to match with image frames generated from the camera while in an unmoved position;a camera operations component configured to control operations of the camera, wherein the camera operations component is configured to suspend movement of the camera, the background subtraction operation performed by the background subtraction component, the generation of point motion estimates by the point tracker component, and the camera motion estimates determined by the motion estimation component in response to a determination of large camera motions, wherein the motion estimation component is configured to estimate and record an extent of the large camera motions in response to the camera operations component suspending the movement of the camera, the background subtraction operation, the generation of point motion estimates, and the camera motion estimates, and wherein the camera operations component is configured to resume movement of the camera, the background subtraction operation, the point tracking and the camera motion estimates in response to a determination that the large camera motions have ceased, the resuming of the background subtraction operation including at least one of acquiring a new background model, detecting a camera position with respect to the existing background model, and initializing a new background model based on older background models; anda camera motion alert component configured to generate an alert in response to a determination that the camera has moved or the camera has ceased moving. |
