After data augmentation, we get a whole load more spectograph images, but a lot of them are blank so it's a really good idea to auto delete all the blank ones. This is done through a function called 'Morphology', which basically counts discrete shapes in an image. Very useful !!!

The image is firstly inverted, then converted to grey scale, then blurred, then a threshold is applied to create a mask, then blended back with the original and finally, the discrete objects are counted. Anything over 1 is kept and anything of value zero is deleted.