cupyx.scipy.ndimage.binary_opening(input, structure=None, iterations=1, output=None, origin=0, mask=None, border_value=0, brute_force=False)[source]#

Multidimensional binary opening with the given structuring element.

The opening of an input image by a structuring element is the dilation of the erosion of the image by the structuring element.

  • input (cupy.ndarray) – The input binary array to be opened. Non-zero (True) elements form the subset to be opened.

  • structure (cupy.ndarray or tuple or int, optional) – The structuring element used for the erosion. Non-zero elements are considered True. If no structuring element is provided an element is generated with a square connectivity equal to one. (Default value = None). If a tuple of integers is provided, a structuring element of the specified shape is used (all elements True). If an integer is provided, the structuring element will have the same size along all axes.

  • iterations (int, optional) – The opening is repeated iterations times (one, by default). If iterations is less than 1, the opening is repeated until the result does not change anymore. Only an integer of iterations is accepted.

  • output (cupy.ndarray, optional) – Array of the same shape as input, into which the output is placed. By default, a new array is created.

  • origin (int or tuple of ints, optional) – Placement of the filter, by default 0.

  • mask (cupy.ndarray or None, optional) – If a mask is given, only those elements with a True value at the corresponding mask element are modified at each iteration. (Default value = None)

  • border_value (int (cast to 0 or 1), optional) – Value at the border in the output array. (Default value = 0)

  • brute_force (boolean, optional) – Memory condition: if False, only the pixels whose value was changed in the last iteration are tracked as candidates to be updated (dilated) in the current iteration; if True all pixels are considered as candidates for opening, regardless of what happened in the previous iteration.


The result of binary opening.

Return type:



This function may synchronize the device.