Hafiz,
This looks already like a very challenging problem. There is not any kind of built in crack detection code. It would be difficult for the computer to distinguish between the crack you intend to detect and similar features like the split between the handles or the screw head. This sort of image classification is in the realm of machine learning computer science - you would need a large number of cracked and uncracked scissor images to train a model to learn the difference.
