Marker Detection =================== The algorithm performs detection of calibration markers. Input ----- Takes a single 2D image set showing a camera calibration target as input. Only 8-bit grayscale and RGB images are supported. Output ------ Tracking sequence with camera poses for each image in case camera calibration was attached to input images. Description ----------- Several typical calibration boards are supported. For their overview and parameters please refer to :ref:`marker configuration`. If checked, the **Automatically detect board border** checkbox indicates that if not all markers were detected during the first time, the marker detection will run the second time with a cropped image that has a center in a bounding box of detected markers and with double the size of the longer side of the bounding box. Note, this is implemented only for some marker types. If known, the intrinsic calibration (see :ref:`camera calibration data component`) of the camera used to capture the input images can be set using the :ref:`Edit Camera Calibration algorithm `. If set, this will allow to visualize not only detections but also the reprojections of the marker corners. .. image:: MarkerDetection.png When the calibration board parameters and (optionally) camera calibration are set, the **Detect** button will run the detection of the markers. The checkboxes **Detections** and **Reprojections** can be toggled to visualize the corresponding points on top of the images. Note, that toggling of **Reprojections** will have no effect if the calibration was not set.