How can I download a specific part of Coco Dataset?

问题

I am developing an object detection model to detect ships using YOLO. I want to use the COCO dataset. Is there a way to download only the images that have ships with the annotations?

回答1:

From what I personally know, if you're talking about the COCO dataset only, I don't think they have a category for "ships". The closest category they have is "boat". Here's the link to check the available categories: http://cocodataset.org/#overview

BTW, there are ships inside the boat category too.

If you want to just select images of a specific COCO category, you might want to do something like this (taken and edited from COCO's official demos):

# display COCO categories
cats = coco.loadCats(coco.getCatIds())
nms=[cat['name'] for cat in cats]
print('COCO categories: \n{}\n'.format(' '.join(nms)))

# get all images containing given categories (I'm selecting the "bird")
catIds = coco.getCatIds(catNms=['bird']);
imgIds = coco.getImgIds(catIds=catIds);

来源：https://stackoverflow.com/questions/51100191/how-can-i-download-a-specific-part-of-coco-dataset