Steve on Image Processing with MATLAB

Image processing concepts, algorithms, and MATLAB


Steve on Image Processing with MATLAB has been archived and will not be updated.

Updates on old business: upslope area and unit testing

A couple of papers have been published recently that are related to some of my old blog topics.

Almost exactly a year ago I posted an xUnit-based unit test harness for MATLAB to the MATLAB Central File Exchange, and I blogged about it here.

Later in the year I wrote an article about it for Computing in Science and Engineering, a joint publication of the IEEE Computer Society and the American Institute of Physics. The article, "Automated Software Testing for MATLAB," appears in the November 2009 issue.

In 2007 I did a series of blog post on developing MATLAB algorithms for a topological measurement called upslope area, a measurement related to digital elevation models (DEMs). The upslope area of a point (pixel) is the total area on the terrain above that point that drains through it. I formulated the computation of upslope area as a sparse linear system, which let me put the MATLAB backslash operator to good use, and I put my upslope area functions on the File Exchange.

At about the same time, File Exchange contributor Wolfgang Schwanghart was developing a similar approach. His paper (with Nikolaus Kuhn), "TopoToolbox: A set of Matlab functions for topographic analysis," is in the January 2010 issue of Environmental Modelling & Software.

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