Create mask within image
createMask is not recommended. Use the
createMask object function associated with the new ROI objects
instead, described in Compatibility Considerations.
Create an ellipse ROI.
imshow('coins.png'); e = imellipse;
Use the mouse to reshape and reposition the ellipse. Then, create a binary mask
from the ROI. Pixels inside the ROI have the value
1, and pixels
outside the ROI have the value
0. Display the mask in a new
BW = createMask(e); figure; imshow(BW)
Not recommended starting in R2018b
Starting in R2018b, a new set of ROI objects replaces the existing set of ROI objects. The new objects provide more functional capabilities, such as face color transparency. The new classes also support events that you can use to respond to changes in your ROI such as moving or being clicked. Although there are no plans to remove the old ROI objects at this time, switch to the new ROIs to take advantage of the additional capabilities and flexibility. For more information on creating ROIs using the new ROI functions, see ROI Creation Overview.
To create a binary mask image using the new ROIs, use the
createMask object function associated with the new
Update all instances of
|Discouraged Usage||Recommended Replacement|
This example uses the
imshow('cameraman.tif') h = imrect(gca, [10 10 100 100]); bw = createMask(h); imshow(bw);
Here is equivalent code, creating a binary mask image
using one of the new ROI objects. Call the
imshow('cameraman.tif') h = drawrectangle(gca,'Position',[10 10 100 100]); bw = createMask(h); imshow(bw);