fillConvexPoly | R Documentation |
fillConvexPoly
fills all the pixels of an image withing a
given convex polygon with a given color. This function is much faster than
the function fillPoly
. It can fill not only convex polygons
but any monotonic polygon without self-intersections, that is, a polygon
whose contour intersects every horizontal line (scan line) twice at the most
(though, its top-most and/or the bottom edge could be horizontal).
fillConvexPoly(image, polygon, color = "white")
image |
An |
polygon |
An m x 2 matrix (or an object that can be converted to an m x 2 matrix), with the first column containing the x coordinates of the polygon and the second column containing the y coordinates of the polygon. |
color |
A value or vector of any kind of R color specification compatible
with |
This function does not return anything. It modifies image
in
place.
Simon Garnier, garnier@njit.edu
Image
, selectROI
, fillPoly
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))
fillConvexPoly(balloon, poly, color = "red")
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