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    %% Detect Regions of Texture in Images
% This example shows how to detect regions of texture in an image using the
% texture filter functions
%%
% Read an image into the workspace and display it.  In the figure, the
% background is smooth--there is very little variation in the gray-level
% values. In the foreground, the surface contours of the coins exhibit more
% texture. In this image, foreground pixels have more variability and thus
% higher range values.
I = imread('eight.tif');
imshow(I)
%%
% Filter the image with the |rangefilt| function and display the results.
% Range filtering makes the edges and contours of the coins visible.
K = rangefilt(I);
figure
imshow(K)