- autolevel - Stretches the local histogram defined by structuring element to cover the full range - 
- p0:
- Defines the lower percentile (0..1) included in histogram 
- p1:
- Defines the upper percentile (0..1) included in histogram 
 
- binary, closing - Perform morphological closing on image. Target and structuring element must be binary - The morphological closing on an image is defined as a dilation followed by an erosion. - Closing can remove small dark spots and connect small bright cracks. 
- binary, dilation - Perform morphological dilation on image. Target and structuring element must be binary - Morphological dilation sets a pixel at (i,j) to the maximum over all pixels in the neighborhood defined by - the structuring element centered at (i,j). Dilation enlarges bright regions and shrinks dark regions. 
- binary, erosion - Perform morphological erosion on image. Target and structuring element must be binary - Morphological erosion sets a pixel at (i,j) to the minimum over all pixels in the neighborhood centered at (i,j). Erosion shrinks bright regions and enlarges dark regions. 
- binary, opening - Perform morphological opening on image. Target and structuring element must be binary - The morphological opening on an image is defined as a erosion followed by a dilation.Opening can remove small white spots and connect small dark cracks. 
- grey, closing - Perform greyscale morphological closing on image. - The morphological closing on an image is defined as a dilation followed by an erosion. - Closing can remove small dark spots and connect small bright cracks. 
- grey, dilation - Return greyscale morphological dilation of an image. - Morphological dilation sets a pixel at (i,j) to the maximum over all pixels in the neighborhood defined by - the structuring element centered at (i,j). Dilation enlarges bright regions and shrinks dark regions. 
- grey, erosion - Return greyscale morphological erosion of an image. - Morphological erosion sets a pixel at (i,j) to the minimum over all pixels in the neighborhood centered at (i,j). Erosion shrinks bright regions and enlarges dark regions. 
- grey, opening - Perform greyscale morphological opening on image. - The morphological opening on an image is defined as a erosion followed by a dilation.Opening can remove small white spots and connect small dark cracks. 
- median - Return the median of the neighborhood defined by sweeping the structuring element over the image. - When used on non-integer datatypes they are first cast into uint8 - This operation functions as a filter suitable to removing salt and pepper noise 
- tophat, black - Return morphological black-tophat of image. - The black top hat of an image is defined as its morphological closing minus the original image. - This operation returns the dark spots of the image that are smaller than the structuring element. - Note that dark spots in the original image are bright spots after the black top hat. 
- tophat, white - Return morphological white-tophat of image. - The white top hat of an image is defined as the image minus its morphological opening. - This operation returns the white spots of the image that are smaller than the structuring element.