Add plotting method for COWC dataset

[nilsleh]

Adding plotting method for COWC dataset.

COWCCounting:

COWCDetection

An Example of image with color:

[adamjstewart]

• For counting, can you give an example image with # cars > 0?
• For detection, it might make more sense for the labels (0/1) to be displayed as Boolean (True/False).

[adamjstewart]

You might be able to put most of the plotting code in the COWC base class, then the subclasses only need to decide what the label/prediction is. If it makes it easier, we could even consider going back from True/False to 1/0 and then we don't need separate plotting code.

[adamjstewart]

This looks good to me, but I'll let others review. I'm starting to flip flop, and I think it might be simpler (less code to maintain) if we go back to your first commit where there's a single plot function for the COWC dataset. Having detection print 1/0 instead of True/False doesn't seem that important to me when compared to the code duplication.

[isaaccorley]

I think this lgtm, although I'm curious why the example plots look to be grayscale? Are the images not RGB?

[adamjstewart]

I'm curious why the example plots look to be grayscale? Are the images not RGB?

The images should be RGB, this seems like a bug in the plotting code in this PR.

[nilsleh]

I believe that while all images in the dataset have RGB channels, they are not all colored, see the example on the dataset website.

[adamjstewart]

Can you show one of the colored images from your plotting method?

[adamjstewart]

I think we should go back to having a single plot method in the superclass instead of adding a lot of extra code just to convert 0/1 to False/True.