Video Registration

Both the camera and the video shot by the camera have spatial geographic information. Before the superposition mapping and combined analysis of the video and GIS data, it is necessary to spatialize the video, make the image Coordinate Transformation into geographic spatial coordinates, and calibrate the geographic Spatial Range of the video. And the mapping relationship between video image space and geographic space is constructed. IDesktopX provides the capability of real-time conversion between video coordinates and map coordinates. When the shooting angle of the monitoring dome camera is rotated and the focal length multiple is changed, Coordinate Transformation can be performed on the video, geofence and other data in real time according to the camera azimuth, pitch angle, field angle and other parameters. Avoid time-consuming and laborious manual adjustment and conversion.

Video Registration principle

The implementation technology of Video Registration and delivery is shown in the following figure: Point O is the camera point, AB is the shot ground range, A 'B' is the corresponding photo range, and C is the photo midpoint. Given the GCS (X, y, H), azimuth angle, pitch angle γ, vertical field angle α, and horizontal field angle β of the camera, the GCS of point C in the photo and the actual distance of the 'B' can be obtained according to the Trig relationship. After the pixel size of the photo is obtained, the actual distance corresponding to each pixel can be obtained according to the corresponding relationship between the pixel size and the actual distance, and then the GCS of any point P 'on the photo can be obtained.

Video types that support registration

  • Fixed-point video, including fixed-focus, zoom, fixed-focus rotation video;
  • UAV video, including fixed focus and zoom video;

Video Parameters description

  • Longitude and latitude: X, Y coordinates, the geographic coordinates of the camera location.
  • Altitude: The absolute or relative altitude of the camera.
  • Yaw: The angle between the camera shooting direction and the due north direction, which is 0 ° for due north and -180 ° for due south, and the angle increases clockwise.
  • Pitch: The angle between the camera body axis (along the nose) and the horizontal plane. The pitch angle of the camera for horizontal plane shooting is 0, the pitch angle of the camera for overhead shooting is negative, and the pitch angle of the camera for orthographic shooting is -90 degrees.
  • Roll: The angle between the plane of symmetry of the aircraft and the vertical plane of the longitudinal axis of the airframe. The roll angle on the right side is positive.
  • FovX: Camera horizontal viewing area (angle).
  • FovY: Camera vertical viewing area (angle).

Contents of this chapter

Calibration Registration : It is applicable to the registration of fixed-point videos, including online and offline videos. This paper introduces how to register fixed-point video.

Camera Parameter Registration : applicable to UAV Video Registration, including online (temporarily not supporting zoom video) and offline video. Describes how to register videos based on Camera Parameters.

Camera Parameter Registration Instance : Introduce the UAV Video Registration process.

Calibration Registration instance : Describes the fixed-point rotation Video Registration process.

SuperMap UAV Survey Video Registration : introduce the SuperMap UAV Survey Video Registration process.