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imdivide

Divide one image into another or divide image by constant

Syntax

Z = imdivide(X,Y)

Description

example

Z = imdivide(X,Y) divides each element in the array X by the corresponding element in array Y and returns the result in the corresponding element of the output array Z.

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

Examples

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This example shows how to divide two uint8 arrays.

X = uint8([ 255 0 75; 44 225 100]);
Y = uint8([ 50 50 50; 50 50 50 ]);

Divide each element in X by the corresponding element in Y. Note that fractional values greater than or equal to 0.5 are rounded up to the nearest integer.

Z = imdivide(X,Y)
Z = 2x3 uint8 matrix

   5   0   2
   1   5   2

Divide each element in Y by the corresponding element in X. Note that when dividing by zero, the output is truncated to the range of the integer type.

W = imdivide(Y,X)
W = 2x3 uint8 matrix

     0   255     1
     1     0     1

Read a grayscale image into the workspace.

I = imread('rice.png');

Estimate the background.

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

Divide out the background from the image.

J = imdivide(I,background);

Display the original image and the processed image.

imshow(I)

figure
imshow(J,[])

Read an image into the workspace.

I = imread('rice.png');

Divide each value of the image by a constant factor of 2.

J = imdivide(I,2);

Display the original image and the processed image.

imshow(I)

figure
imshow(J)

Input Arguments

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First array (dividend), specified as a real, nonsparse, numeric or logical array of any dimension.

Second array (divisor) to be divided from X, specified as a real, nonsparse, numeric or logical array. Y either has the same size and class as X, or Y is a scalar of type double.

Output Arguments

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Quotient, 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, elements of the output that exceed the range of the integer type are truncated, and fractional values are rounded.

Introduced before R2006a