Documentation

imsubtract

Subtract one image from another or subtract constant from image

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Syntax

Z = imsubtract(X,Y)

Description

Z = imsubtract(X,Y)subtracts each element in arrayYfrom the corresponding element in arrayXand returns the difference in the corresponding element of the output arrayZ.XandYare real, nonsparse numeric arrays of the same size and class, orYis a double scalar. The array returned,Z, has the same size and class asXunlessXis logical, in which caseZis double.

If X is an integer array, elements of the output that exceed the range of the integer type are truncated, and fractional values are rounded.

Examples

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Open Live Script

This example shows how to subtract twouint8arrays. Note that negative results are rounded to 0.

X = uint8([ 255 0 75; 44 225 100]); Y = uint8([ 50 50 50; 50 50 50 ]); Z = imsubtract(X,Y)
Z =2×3 uint8 matrix205 0 25 0 175 50
Open Live Script

Read a grayscale image into the workspace.

I = imread('rice.png');

估计背景。

background = imopen(I,strel('disk',15));

Subtract the background from the image.

J = imsubtract(I,background);

Display the original image and the processed image.

imshow(I)

figure imshow(J)

Open Live Script

Read an image into the workspace.

I = imread('rice.png');

Subtract a constant value from the image.

J = imsubtract(I,50);

Display the original image and the result.

imshow(I)

figure imshow(J)

See Also

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Introduced before R2006a

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