immultiply - Multiply two images or multiply image by constant
Syntax
Z = immultiply(X,Y)
Description
Z = immultiply(X,Y) multiplies
each element in array X by the corresponding element
in array Y and returns the product in the corresponding
element of the output array Z.
If X and Y are real numeric
arrays with the same size and class, then Z has
the same size and class as X. If X is
a numeric array and Y is a scalar double, then Z has
the same size and class as X.
If X is logical and Y is
numeric, then Z has the same size and class as Y.
If X is numeric and Y is logical,
then Z has the same size and class as X.
immultiply computes each element of Z individually
in double-precision floating point. If X is an
integer array, then elements of Z exceeding the
range of the integer type are truncated, and fractional values are
rounded.
Note
On Intel architecture processors, immultiply can
take advantage of the Intel Integrated Performance Primitives
(Intel IPP) library, thus accelerating its execution time. The Intel IPP
library is activated only if arrays X, Y,
and Z are of class logical, uint8,
or single, and are of the same class. |
Examples
Multiply an image by itself. Note how the example converts the
class of the image from uint8 to uint16 before
performing the multiplication to avoid truncating the results.
I = imread('moon.tif');
I16 = uint16(I);
J = immultiply(I16,I16);
imshow(I), figure, imshow(J)Scale an image by a constant factor:
I = imread('moon.tif');
J = immultiply(I,0.5);
subplot(1,2,1), imshow(I)
subplot(1,2,2), imshow(J)See also
imabsdiff, imadd, imcomplement, imdivide, imlincomb, imsubtract, ippl
 | immovie | | imnoise |  |
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