CamBar Alignment

this is an important step that calculates how the cambar is mounted relative to the camera it does not need to be repeated if a good cambar alignment is already present this could be from a previous calibration session or a tracking config the process works best using wide angle lenses if calibrating a long focal length lens it is recommended to do the cambar alignment using a wider lens and then swap back to the long lens and to skip this step it is vital that the cambar is correctly mounted to the camera as described previously (forward, central and no rotation) an automatic or manual method for determining the offset are offered automatic offset the automatic process will use the tracking features and a instant recovery chart to try and optically align the cambar to the camera to improve the accuracy of the cambar alignment, it is important to make some physical measurements to help the system refine use a tape measure to accurately measure from the camera sensor to the sensor mark on the side of the cambar a value should be entered for the y (height) and z (forward) directions a value should be entered for the y (height) and z (forward) directions y values when the cambar is above the sensor should be positive y values when the cambar is above the sensor should be positive z values when the cambar is infront of the sensor should be negative z values when the cambar is infront of the sensor should be negative it’s important that these measurements are entered accurately after the values have been entered into the ui ensure the following focus is set to infinity the instant recovery chart is placed in the centre of the camera frame and is stable and not moving if using a zoom lens, make sure it is fully wide proceed to the " automatic estimation automatic estimation " stage, at this point the system will start trying to align the two devices over the next few seconds, the system will refine the position of the cambar this can be seen in the viewing frustums of the camera as well as in the offset values displayed in the ui when the values are stable press " stop automatic offset automation stop automatic offset automation " to end the process the step can be repeated if necessary if the chart is moved during this process, or the tracking is interrupted or unstable, then poor results will occur repeat the process if needed manual offset the manual offset method allows the user to manually adjust the x,y,z and pan, tilt, roll values of the cambar to try and visually match the devices the ui displays the point cloud from both the cambar and main camera views, by adjusting the offset, the points in the main camera view will update to reflect the changes because at this stage of the lens calibration, as lens is not fully calibrated, it's likely that tracking points in the main camera view will be misaligned, particularly towards the edges of the frame doing a manual offset is tricky and it is typically recommended to use the optical, automatic method primarily when doing a manual alignment, try and reduce the cambar rotation and use measured values to reduce the amount of adjustment required