First Order Derivatives of an Image with the Sobel Operator

spatialGradient calculates the first order derivative of an image in both x and y using a Sobel operator.

Usage

spatialGradient(image, k_size = 5)

Arguments

image

An Image object.

k_size

The half-size in pixels of the kernel (default: 5).

Value

A list containing two Image objects, one of for the derivative along the x axis and the other for the derivative along the y axis.

See also

Image, sobel

Author

Simon Garnier, garnier@njit.edu

Examples

balloon <- image(system.file("sample_img/balloon1.png", package = "Rvision"))
balloon_gradient <- spatialGradient(balloon, 5)