• addnoise—Adds noise to an image matrix.

• binarize—Returns a binarized version of an image matrix.

• equalize—Returns an equalized grayscale image matrix.

• funmap, levelmap—Changes the intensity of an image matrix according to a function or to a vector of values.

• imhist, imhist2, hist2d—Returns a 1D or 2D histogram of an image matrix.

• threshold—Resets elements of an image matrix below a threshold value.

• invertimage—Inverts an image matrix.

• clip, scale—Clips or scales an image matrix.