Opening and closing

open(M, Melem, b) Performs binary opening on matrix M at threshold b using structuring element Melem.

close(M, Melem, b) Performs binary closing on matrix M at threshold b using structuring element Melem.

Arguments:

• M is an image matrix.
• Melem is a vector or matrix.
• b is a real number.

Notes:

• These functions have binary output: foreground is always set to 255, while background is always set to 0.