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30 Image Processing

Since an image basically is a matrix Octave is a very powerful environment for processing and analysing images. To illustrate how easy it is to do image processing in Octave, the following example will load an image, smooth it by a 5-by-5 averaging filter, and compute the gradient of the smoothed image.

I = loadimage ("default.img");
S = conv2 (I, ones (5, 5) / 25, "same");
[Dx, Dy] = gradient (S);

In this example S contains the smoothed image, and Dx and Dy contains the partial spatial derivatives of the image.