This example shows how to use
regionfill to fill a region of interest
(ROI) in an image. The example uses the
to define the region of interest interactively with the mouse.
regionfill smoothly interpolates inward
into the region from the pixel values on the boundary of the polygon.
You can use this function for image editing, including removal of
extraneous details or artifacts. The filling process replaces values
in the region with values that blend with the background.
Read an image into the MATLAB® workspace and display it.
I = imread('eight.tif'); imshow(I)
Create a mask image to specify the region
of interest (ROI) you want to fill. Use the
to specify the region interactively. Call
move the pointer over the image. The pointer shape changes to cross
. Define the ROI by clicking the mouse
to specify the vertices of a polygon. You can use the mouse to adjust
the size and position of the ROI.
mask = roipoly(I);
Double-click to finish defining the region.
roipoly creates a binary image with the
region filled with 1-valued pixels.
Display the mask image.
Fill the region, using
regionfill, specifying the image to be
filled and the mask image as inputs. Display the result. Note the
image contains one less coin.
J = regionfill(I,mask); figure, imshow(J)