cv2d - convert 1-dimensional index to 2-dim coordinate
i  w  cv2d -> y   x  
int int int int

Description:This function transforms an array index to y,x
coordinate pair. Useful if you have intrinsically 2-dimensional
data stored in a linear array (e.g. images).

Parameters:i : integer. the index in the array
h : integer. the number of rows in the 2-dimensional space
w : integer. the number of columns in the 2-dimensional space

Example:14 4 cv2d -> 3 2
14 is the index of the corresponding element in a 1-dimensional array
4 is the number of columns
3 is the resulting y-coordinate (row)
2 is the resulting x-coordinate (column)

SeeAlso: Source: