Patent Document ID: 9953421
Application ID: 14667502
Patent Status: 1

Claim One:
1. A video camera, comprising: an apparatus for video camera calibration configured to calibrate the video camera based on a plurality of video images shot by the video camera, the apparatus comprising a device for determining a disappearing direction and a video camera calibration device, wherein the device for determining the disappearing direction comprises: circuitry configured to: detect, in the video images, a moving target area where a moving object is located; extract at least one feature point on the moving object in the detected moving target area, the at least one feature point being a corner of the moving object, or a corner of texture of the moving object; track a movement of the at least one feature point in a predetermined number of video image frames to obtain a movement trajectory of the at least one feature point; for each feature point, fit a line segment according to the movement trajectory of the respective feature point in the predetermined number of video image frames; and determine, by using the line segment of each feature point, the disappearing direction defined by a major moving direction of the moving objects, and wherein the video camera calibration device is configured to determine a gesture of the video camera relative to a ground by using the disappearing direction determined by the device for determining the disappearing direction.