Performs advanced morphological transformations

dst = cv.morphologyEx(src, op)
dst = cv.morphologyEx(src, op, 'OptionName',optionValue, ...)

Input

• src Source image. The number of channels can be arbitrary. The depth should be one of uint8, uint16, int16, single or double.
• op Type of a morphological operation that can be one of the following:
  • Erode see cv.erode
  • Dilate see cv.dilate
  • Open an opening operation dst = open(src,element) = dilate(erode(src,element))
  • Close a closing operation dst = close(src,element) = erode(dilate(src,element))
  • Gradient a morphological gradient dst = morph_grad(src,element) = dilate(src,element) - erode(src,element)
  • Tophat "top hat" dst = tophat(src,element) = src - open(src,element)
  • Blackhat "black hat" dst = blackhat(src,element) = close(src,element) - src
  • HitMiss "hit or miss". Only supported for uint8 1-channel binary images. A tutorial can be found in this page.

Output

• dst Destination image of the same size and type as source image.

Options

• Element Structuring element kernel. It can be created using cv.getStructuringElement. Empty by default, which uses a 3x3 rectangular structuring element by default.
• Anchor Position of the anchor within the element. The default value [-1,-1] means that the anchor is at the element center.
• Iterations Number of times erosion and dilation are applied. default 1
• BorderType Pixel extrapolation method. See cv.copyMakeBorder. default 'Constant'
• BorderValue Border value in case of a constant border. The default value has a special meaning. See cv.dilate and cv.erode for details.

The function cv.morphologyEx can perform advanced morphological transformations using an erosion and dilation as basic operations.

In case of multi-channel images, each channel is processed independently.

Note: The number of iterations is the number of times erosion or dilatation operation will be applied. For instance, an opening operation (Open) with two iterations is equivalent to apply successively: erode -> erode -> dilate -> dilate (and not erode -> dilate -> erode -> dilate).