imimposemin

Impose regional minima at marker pixels.

📝Syntax

J = imimposemin(I, BW)
J = imimposemin(I, BW, conn)

📥Input Arguments

Parameter	Description
I	Input finite real 2-D image.
BW	Binary marker mask with the same size as I.
conn	Connectivity, either 4, 8, or an equivalent 3-by-3 matrix.

📤Output Arguments

Parameter	Description
J	Image whose marker pixels are forced to be minima.

📄Description

imimposemin modifies an image so that marker pixels become the lowest minima. This is useful before watershed segmentation when known markers should seed catchment basins.

💡Examples

Use markers before watershed

I=[5 4 5;4 3 4;5 4 5];
markers=false(3,3); markers(1,1)=true;
J=imimposemin(I,markers);
L=watershed(J,4);
figure; subplot(1,3,1); imagesc(I); title('Input');
subplot(1,3,2); imagesc(J); title('Imposed');
subplot(1,3,3); imagesc(L); title('Watershed');

🕔Version History

Version	Description
2.0.0	initial version

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