I followed your guidance to generate CarFusion.
First, I downloaded all the zip files from CarFusion website and extract them into:
-train: car_butler1 car_butler2 car_craig1 car_craig2 car_fifth1 car_fifth2 car_morewood1 car_morewood2
-test: car_penn1 car_penn2
Second, I used the official tools to convert the annotations to COCO format, resulting in car_keypoints_test.json, car_keypoints_train.json.
Finally, I renamed all the jpg files using your rename_carfusion_image.py.
However, the images obtained are not consistent with your annotation files. For example, in your annotation files, there is an image with name 'car/1500801201.jpg' which is missing in the generated images.