Draw Circles on an Image

drawCirlc draws circles over an Image object. This operation is destructive: it changes irreversibly the Image object and cannot be undone.

Usage

drawCircle(image, x, y, radius, color = "red", thickness = 1)

Arguments

image

An Image object.

x

A numeric value or vector representing the x coordinates of the centers of each circle.

y

A numeric value or vector representing the y coordinates of the centers of each circle.

radius

A numeric value or vector representing the radii of each circle.

color

A value or vector of any kind of R color specification compatible with col2bgr representing the color of each circle's outline (default: "red").

thickness

A numeric value or vector representing the thickness in pixels of each circle's outline (default: 1). If negative, then a filled rectangle is drawn.

Value

This function does not return anything. It modifies image in place.

See also

Image, drawEllipse

Author

Simon Garnier, garnier@njit.edu

Examples

balloon <- image(system.file("sample_img/balloon1.png", package = "Rvision"))
drawCircle(balloon, 365, 245, 90, thickness = 3)
#> NULL