contour


Input


An integer between 0 and 116 specifying the input image frame number. A value of 0 represents the DMA memory buffer of the video device. 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.


Mode


An enumerated integer that describes the mode in which the function operates. Must be one of the following values:


M_INTERNAL=0 – extracts the internal contours of objects by subtracting the eroded image from the original one.

M_EXTERNAL=1 – extracts the external contours of objects by subtracting the original image from the one.

M_BOTH=2 – extracts both the internal and external contours of objects by subtracting the eroded image from the dilated one.


Probe


An enumerated integer that describes the shape and size of the kernel used in the operation. Select one of the following frequently used shapes:


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)

PR_CROSS=5 – cross 3x3

PR_DCROSS=10 – diagonal cross 3x3

PR_SQUARE=15 – square 3x3

PR_CIRCLE=16 – circle 5x5


ERR_OK


The flag set if successful.


ERR_FAILED


The flag set if failed.

This set of statements binarizes a sample image and extracts the internal contours of objects:


setCurDir ("samples")

loadIm (1,"sample4.iwd")

threshold(1,1,M_PRESET,0.,113.,TRUE,FALSE)

contour(1,2,0,15)
