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Ok take a step back. Simply googling the opencv documentation and looking at the threshold function, you can see the following thing.

src – input array (single-channel, 8-bit or 32-bit floating point)

This means that you cannot supply a 16 bit unsigned image to that function. It is simply not implemented. I agree that the above SimpleBlobDetector should get a check on the input type however not to trigger this. Will look deeper into it and supply a fix.

Ok take a step back. Simply googling the opencv documentation and looking at the threshold function, you can see the following thing.

src – input array (single-channel, 8-bit or 32-bit floating point)

This means that you cannot supply a 16 bit unsigned image to that function. It is simply not implemented. I agree that the above SimpleBlobDetector should get a check on the input type however not to trigger this. Will look deeper into it and supply a fix.

Ok take a step back. Simply googling the opencv documentation and looking at the threshold function, you can see the following thing.

src – input array (single-channel, 8-bit or 32-bit floating point)

This means that you cannot supply a 16 bit unsigned image to that function. It is simply not implemented. I agree that the above SimpleBlobDetector should get a check on the input type however not to trigger this. Will look deeper into it and supply a fix.

Okay the problem is actually here. The code assumes that a correct type was supplied, but it doesn't check if the type is 8 bit or 32 bit. We should force to input to be changed to a single channel 8 bit image.