Fill Polygon with Color in Image

fillPoly fills all the pixels of an image withing a given polygon with a given color.

Usage

fillPoly(image, polygon, color = "white")

Arguments

image

An Image object.

polygon

An m x 2 matrix (or an object that can be converted to an m x 2 matrix) or a list of m x 2 matrices, with the first column containing the x coordinates of the polygons and the second column containing the y coordinates of the polygons.

color

A value or vector of any kind of R color specification compatible with col2bgr representing the color to fill the polygon with (default: "white").

Value

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

See also

Image, selectROI, fillConvexPoly

Author

Simon Garnier, garnier@njit.edu

Examples

balloon <- image(system.file("sample_img/balloon1.png", package = "Rvision"))
poly <- data.frame(x = c(290, 290, 440, 440), y = c(170, 325, 325, 170))
fillPoly(balloon, poly, color = "red")
#> NULL