Page 65 - 3DF Zephyr

When photographic survey is completed and after the cameras orientation phase is done you can start the automatic detection of coded targets by clicking on Tools > Control Points and Distances > Detect Markers. In the new windows you have to specify: - Which is the context where coded targets have been exploited (Urban, Close Range, Aerial); - Which preset (detection quality) you want to run; - The amount of coded targets within the scene; After clicking the confirmation button, 3DF Zephyr will start the automatic target recognition and will set the control points based on the detected targets. Please note that the automatic target recognition has to be started AFTER having completed the camera orientation phase in Zephyr. Tools - Registration These functions are available in 3DF Zephyr Aerial and 3DF Zephyr Pro only. The registration menu allows to handle point clouds registration. From this menu you can access the ICP function ( Iterative Closest Point (ICP) is an algorithm employed to minimize the difference between two clouds of point ) and see a point cloud difference report. Point cloud registration (ICP) Use this function when you need to align a laser scanned point cloud with a photogrammetry point cloud: this function consider translation, rotation and scale. Using this function you can then align a laser scanned point cloud which can then later, for example, be structured and colored with the photogrammetry obtained point cloud. Multi view point cloud bundle adjustment (Multi ICP) Use this function when dealing with many point clouds that are already in the correct scale system, for example multiple scans from a laser scanner device. This function does not apply any scale factor. Please remember that:  the objects must be close to each other  You can used this tool to register multiple unstructured objects and structured ones  the adjustment and the minimization will be performed in a global way  if you need to register point sets with different scales, it is advisable to use the two view ICP dialog and enable scaling. When objects are not close enough (as in most cases) simply use the gizmo to bring the point clouds close together. Please refer to 3dflow.net online tutorials for a visual explanation of this process. The fist wizard page will ask which objects will interact: