Cropping an Image
To extract a rectangular portion of an image, use the imcrop function. Using imcrop,
you can specify the crop region interactively using the mouse or programmatically
by specifying the size and position of the crop region.
This example illustrates an interactive syntax. The example
reads an image into the MATLAB workspace and calls imcrop specifying
the image as an argument. imcrop displays the image
in a figure window and waits for you to draw the crop rectangle on
the image. When you move the pointer over the image, the shape of
the pointer changes to cross hairs
. Click and drag the pointer
to specify the size and position of the crop rectangle. You can move
and adjust the size of the crop rectangle using the mouse. When you
are satisfied with the crop rectangle, double-click to perform the
crop operation, or right-click inside the crop rectangle and select Crop
Image from the context menu. imcrop returns
the cropped image in J.
I = imread('circuit.tif')
J = imcrop(I);
You can also specify the size and position of the crop rectangle
as parameters when you call imcrop. Specify the
crop rectangle as a four-element position vector, [xmin ymin
width height].
In this example, you call imcrop specifying
the image to crop, I, and the crop rectangle. imcrop returns
the cropped image in J.
I = imread('circuit.tif');
J = imcrop(I,[60 40 100 90]);
 | Rotating an Image | | Performing General 2-D Spatial Transformations |  |
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