How to find Dice Similarity Coefficient?

I research 3 D volumetric brain tumor image using Brats 2016 and 2017 dataset. I will find dice coefficient .But following error

Error using dice (line 117)

Expected input number 2, B, to be one of these types:

logical, double, categorical

Instead its type was uint8. In dataset, is groundturth image labelTr?.

Answer 1

[Image Analyst]

How do you expect it to determine the union and overlap with grayscale images? You have to segment them into binary images first.

[hla hla myint]

Thanks Teacher