Calculates the Laplacian of an image

dst = cv.Laplacian(src)
dst = cv.Laplacian(..., 'OptionName', optionValue, ...)

Input

• src Source image.

Output

• dst Destination image of the same size and the same number of channels as src.

Options

• DDepth Desired depth of the destination image. default -1, which uses the same type as the input src.
• KSize Aperture size used to compute the second-derivative filters. See getDerivKernels for details. The size must be positive and odd. default 1
• Scale Optional scale factor for the computed Laplacian values. By default, no scaling is applied. See cv.getDerivKernels for details. default 1
• Delta Optional delta value that is added to the results prior to storing them in dst. default 0
• BorderType Pixel extrapolation method, see cv.copyMakeBorder. Default 'Default'

The function calculates the Laplacian of the source image by adding up the second x and y derivatives calculated using the Sobel operator:

dst = \Delta src = d^2(src)/dx^2 + d^2(src)/dy^2

This is done when KSize > 1. When KSize = 1, the Laplacian is computed by filtering the image with the following 3x3 aperture:

[0, 1, 0; 1,-4, 1; 0, 1, 0]