imsubtract
Subtract one image from another or subtract constant from image
Syntax
Description
Examples
Subtract Two uint8 Arrays
This example shows how to subtract two uint8
arrays. 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 = 2x3 uint8 matrix
205 0 25
0 175 50
Subtract Image Background
Read a grayscale image into the workspace.
I = imread('rice.png');
Estimate the background.
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)
Subtract a Constant from an Image
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)
Input Arguments
X
— First array
numeric array | logical array
First array (minuend), specified as a numeric array or logical array of any dimension.
Y
— Second array
numeric scalar | numeric array | logical array
Second array (subtrahend) to be subtracted from X
,
specified as a numeric array or logical array of the same size and class as
X
, or a numeric scalar of type
double
.
Output Arguments
Z
— Difference
numeric array
Difference, returned as a numeric array of the same size as
X
. Z
is the same class as
X
unless X
is logical, in
which case Z
is data type double
. If
X
is an integer array, then elements of the output
that exceed the range of the integer type are truncated, and fractional
values are rounded.
Version History
Introduced before R2006a
See Also
imabsdiff
| imadd
| imcomplement
| imdivide
| imlincomb
| immultiply
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