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Morphological Operations

8-5

NOTE. All source image attributes are defined in the image header

pointed to by

srcImage.

Dilate

Dilates the image.

void iplDilate(IplImage*

srcImage

, IplImage*

dstImage

, int

nIterations

);

srcImage

Thesourceimage.

dstImage

The resultant image.

nIterations

The number of times to dilate the image.

Discussion

The function iplDilate() performs a dilation of the image

nIterations

times. The way the image is dilated depends on whether the image is

binary, gray-scale, or a color image.

• For a binary input image, the output pixel is set to 1 if the corresponding

input pixel is 1 or any of 8 neighboring input pixels is 1.

• For a gray-scale image, the output pixel is set to the maximum of the

corresponding input pixel and its 8 neighboring pixels.

• For a color image, each color channel in the output pixel is set to the

maximum of this channel’s values at the corresponding input pixel and

its 8 neighboring pixels.

The effect of dilation is to fill up holes and to thicken boundaries of objects

on a dark background (that is, objects whose pixel values are greater than

those of the background).

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Cirrus Logic CS485 Spécifications Page 171