The Image Processing Toolbox function regionprops gives you measurements of shape-based measurements of image regions. It's pretty useful, and I have shown many examples of it on this... read more >>

When I dipped my toe into the Fourier transform waters last week, the resulting comments and e-mail indicated there is a lot of interest in tutorial material and explanations. I'm willing, ... read more >>

I was looking at the image below on a web page recently and I decided to extract the locations of all the dots. I thought the procedure might make a nice little end-of-the-week how-to... read more >>

We've been working for a while now to make Image Processing Toolbox functions run faster. The R2009b release notes mention several performance improvements. We've gotten some feedback, though,... read more >>

Sometimes I'd really like to be able to go back in time and fix a few of the functional designs in the Image Processing Toolbox. In a few cases the original design flaw is that we bundled... read more >>

Today's post in my continental divide series demonstrates the final computational step and shows one procedure for visualizing the Pacific and Atlantic catchment basins. In my previous... read more >>

Today, in part 5 of my series on computing the US continental divide, we'll look at a technique called minima imposition. Previously we looked at data import and display, the watershed transform... read more >>

Welcome to part 4 of my series on computing the US continental divide. Previously we looked at data import and display, the watershed transform and label matrices, and different kinds of... read more >>

In the previous post in this series on computing the US continental divide, we used the watershed function to find catchment basins in a DEM (digital elevation model). The result was more than... read more >>

This post is the second in my series on computing the location of the US continental divide. Today I'm going to look at the watershed transform, including how to compute and visualize it... read more >>