direction

direction ( integer Input, integer Output )

Use this function to perform the direction transform of an image or selection. The function builds a multiphase image with pixel indexes corresponding to the direction of the intensity gradient in the input image. Values from 1 to 8 correspond to eight major directions starting from the positive X-axis clockwise. The zero value indicates the absence of gradient in the target point.

Parameters

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 100-116 correspond to hidden frames.

Output

An integer between 1 and 116 specifying the output image frame number. Values in the range of 100-116 correspond to hidden frames.

Error flags

ERR_OK

The flag set if successful.

ERR_FAILED

The flag set if failed.

Example

This set of statements builds the direction map of a sample image:

setCurDir ("samples")

loadIm (1,"sample4.iwd")

direction(1,2)