Note: You can also crop an image interactively using the Image Tool — see Crop Image Using Image Viewer App.
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]);