Erosion

erode(M, Melem, r_origin, c_origin, b) Performs binary erosion on matrix M at threshold b using structuring element Melem with origin at row r_origin and column c_origin.

erode4(M, b) Performs erosion on matrix M at threshold b using 4 neighbors.

erode8(M, b) Performs erosion on matrix M at threshold b using 4 neighbors.

Arguments:

• M is an image matrix.
• Melem is a vector or matrix.
• b is a real number.
• r_origin, c_origin are integers, where sign indicates direction.

Notes:

• The erode function has binary output: foreground is always set to 255, while background is always set to 0.