medialAxis


Input


An integer between 1 and 116 specifying the input image frame number. Values in the range of 100116 correspond to hidden frames.


Output


An integer between 1 and 116 specifying the output image frame number. Values in the range of 100116 correspond to hidden frames.


Probe


An enumerated integer that describes the shape and size of the kernel used in the operation. The value is determined as a combination of four basic shapes constructed of 3 pixels:


PR_VBAR=1 – vertical bar

PR_BKSLASH=2 – diagonal bar (top left – bottom right)

PR_HBAR=4 – horizontal bar

PR_FWSLASH=8 –diagonal bar (bottom left – top right)


The following frequently used shapes represent combinations of the basic shapes:


PR_CROSS=5 – cross 3x3

PR_DCROSS=10 – diagonal cross 3x3

PR_SQUARE=15 – square 3x3


You can also assign one kernel of size 5x5:


PR_CIRCLE=16 – circle 5x5


Mode


An enumerated integer that describes the direction of the transform:


M_DIRECT – performs the medial axis transform reducing objects to single pixels.

M_INVERSE – performs the inverse transform which restores the original binary image from the result of its direct transform.

Default value: M_DIRECT


ERR_OK


The flag set if successful.


ERR_FAILED


The flag set if failed.

This set of statements binarizes a sample image performs the direct medial axis transform and then restores the binary image by applying the inverse transform:


setCurDir ("samples")

loadIm(1,"sample4.IWD")

threshGauss(1,1,0,1,0)

medialAxis(1,2, PR_SQUARE, M_DIRECT)

medialAxis(2,3, PR_SQUARE,M_INVERSE)

