From package 'obj_detector'
./src/DetectionCatNode_node.cpp
Node that concatinates the detections of two detectors together, emulating one "big camera".
/object_detection_cat: Concatinated points, in the common frame and with overlapping detections removed.
/object_detection1: First detection source/object_detection2: Second detection source
common_frame: Common frame to transform both topics into.overlap_tolerence: Overlapping detections under distince tolerence will be combined into one.