Patent ID: 8305450
Filing Date: 2012-11-06
Classification: G01S

Abstract:
1. A mobile object image tracking apparatus comprising: a base; a first gimbal provided on the base to be rotatable with respect to the base, the first gimbal having an opening; a second gimbal provided in the opening of the first gimbal to be rotatable with respect to the first gimbal, the second gimbal being formed with an input opening portion that receives an image of a mobile object being set as a tracking target; an image guiding passage configured to guide the image that is received through the input opening portion of the second gimbal to the base through the second gimbal and the first gimbal; an image capturing device provided in the base, the image capturing device being configured to capture the image guided by the image guiding passage and output image data; an angle sensor configured to detect a first rotation angle of the first gimbal and a second rotation angle of the second gimal; a tracking error detector configured to extract feature points from a plurality of the image data output from the image capturing device and detect a first tracking error of the image data based on the feature points; a delay circuit configured to delay the first rotation angle and the second rotation angle and output a delayed first rotation angle and a delayed second rotation angle; a tracking error calculator configured to calculate a second tracking error based on the first tracking error, the delayed first rotation angle, and the delayed second rotation angle; an angular velocity processor configured to generate a first target angular velocity for the first gimbal and a second target angular velocity for the second gimbal based on the first rotation angle, the second rotation angle, and the second tracking error; and an actuator controller configured to control a first actuation of the first gimbal based on the first target angular velocity and control a second actuation of the second gimbal based on the second target angular velocity.