The block is used to append all the algorithm's predictions before/after the preprocessing process to be evaluated or submitted later. It saves the results as a json file with the same format of the nuScenes Challenges. It works for the detection/tracking evaluation. It will discard the boxes with no lidar and radar points.
This block selects multiple or a single Region Of Interest (ROI), represented by bounding boxes or polygons, from the input image and blacks out the rest of the image.
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