Split image by alpha value 1 objective-c

Question

Reference Link here...

Please find the image from above link. I need to extract all Black colored sharp objects from the above like specified image to a NSDictionary . The goal is to find the sizes of separate objects from split-ted images. I did the image alpha to 1 in object pixels and other are transparent, say alpha 0. Can anyone help me to achieve it? Thanks in advance... :)

Answer 1

Try Core image filters [1], or this great post on NSHipster: [2]

[1] https://developer.apple.com/library/mac/#documentation/graphicsimaging/reference/CoreImageFilterReference/Reference/reference.html

[2] http://www.nshipster.com/gpuimage/