imorph

Morphological neighbourhood processing

out = imorph(im, se, op) is the image im after morphological processing with the operator op and structuring element se.

The structuring element se is a small matrix with binary values that indicate which elements of the template window are used in the operation.

The operation op is:

'min'	minimum value over the structuring element
'max'	maximum value over the structuring element
'diff'	maximum - minimum value over the structuring element
'plusmin'	the minimum of the pixel value and the pixelwise sum of the structuring element and source neighbourhood.

out = imorph(im, se, op, edge) as above but performance of edge pixels can be controlled. The value of edge is:

'border'	the border value is replicated (default)
'none'	pixels beyond the border are not included in the window
'trim'	output is not computed for pixels where the structuring element crosses the image border, hence output image had reduced dimensions.
'wrap'	the image is assumed to wrap around, left to right, top to bottom.

Notes

Is a MEX file.
Performs greyscale morphology.
The structuring element should have an odd side length.
For binary image 'min' = EROSION, 'max' = DILATION.
The 'plusmin' operation can be used to compute the distance transform.
The input can be logical, uint8, uint16, float or double, the output is always double