CamBar Calibration

what is cambar calibration? cambar calibration is a process that refines and updates the internal calibration of the cambar calibration may be required following physical shock or mishandling, such as dropping the cambar transporting the cambar without adequate protection heavy vibration or impact during shipping the calibration process improves the accuracy of the cambar’s internal scale and tracking performance before you begin cambar calibration should only be performed when required before calibrating use the scale check tool to determine whether calibration is necessary ensure adequate time and space are available to complete and verify the process prepare an environment with stable, high quality tracking features improper calibration can significantly reduce tracking quality scale check guidance the scale check tool should always be used before and after calibration lower scale error values indicate better calibration accuracy a well calibrated cambar will typically measure approximately 0 5–1% scale error it is critical that all measurements are performed carefully and accurately poor measurements can incorrectly indicate a calibration issue when none exists when performing a scale check move the cambar through the environment at least once before measuring ensure measurements are physically accurate avoid rushed or unstable movements recommended setup connecting the cambar directly to the origin is recommended during calibration while not required, this can improve system responsiveness tracking stability overall calibration robustness typical calibration time 5–10 minutes , including validation avoid starting calibration unless there is sufficient time to fully verify the results relearning tracking configs changes in cambar calibration can require marker based tracking configurations to be relearnt calibration environment requirements cambar calibration works by observing stable tracking features from multiple viewpoints a poor environment can reduce calibration quality or cause calibration failure natural tracking good tracking features good calibration environments contain nearby features within approximately 2–5m flat textured surfaces static objects with visible detail examples include posters rugs logos textured walls furniture poor tracking features avoid environments containing reflections moving people moving foliage bright glare repetitive patterns thin geometric structures features that change appearance significantly between viewpoints examples of problematic features lighting grids lens calibration charts repeated tile patterns reflective surfaces avoid features whose appearance changes significantly from different viewpoints for example, reflections or partially occluded objects may appear inconsistent as the cambar moves, reducing tracking quality marker mode guidance note marker mode calibration is not recommended when markers are 15m or more from the cambar marker mode tracking is a feasible option for cambar calibration and is recommended when conducting calibration in marker based studios calibration procedure verify calibration is required use the scale check tool to confirm that cambar calibration is necessary before beginning refer to the cambar measure tool documentation for detailed scale check instructions prepare the environment choose an area with stable, high quality tracking features avoid reflections moving objects crowded environments large repetitive patterns open the calibration assistant open the connection status menu shift + click to access the engineering menu select natural mode , or marker mode depending on the environment being used begin learning the environment face the cambar toward an area containing good tracking features slowly move the cambar while keeping the area in view observe the environment from multiple viewpoints as though scanning it important move slowly and smoothly avoid fast motion keep tracking features visible throughout the process continue until learning completes the system will indicate when sufficient movement and environmental learning has been completed run calibration press calibrate to generate a refined calibration once complete press persist to save the calibration to the cambar verify results perform another scale check after calibration this is strongly recommended to confirm that scale accuracy has improved calibration quality is acceptable severely degraded cambars may require multiple calibration passes to progressively improve calibration quality finish once the scale check results have measurably improved, the calibration assistant can be closed what if calibration fails? calibration can fail for several reasons, including the existing calibration is too degraded to refine poor tracking features were learned during the environment scan excessive movement or unstable tracking during calibration troubleshooting repeat the learn phase retry the calibration process using better tracking features a smaller scanning area more stable environmental conditions focus on nearby, textured, static features factory reset the cambar factory reset restores the cambar to its original factory calibration this can provide a stable baseline for further refinement factory calibration may not be optimal after a factory reset always perform a scale check factory reset is available from the first page of the cambar calibration assistant importing and exporting calibration calibration import/export is available from the cambar calibration menu these functions are only available when accessing the ui through a web browser exporting calibration exported calibration files are downloaded through the browser saved to the browser’s default download location importing calibration when importing a file picker window will appear select the desired calibration file from the local file system calibration files are tied to a specific cambar serial number it is not possible to import calibration data from a different cambar a notification will appear if the serial numbers do not match tips & best practices the cambar does not need to be mounted to the camera during calibration handholding the cambar can make environment learning easier handholding can also simplify scale check measurements move slowly throughout the process fast motion can reduce calibration quality verify improvements using scale check after every calibration pass multiple passes may be required for severely degraded calibration states