Thinking about test images (13-Jan-2006, 16-Jul-2011, 19-Jul-2011, 19-Jul-2011) recently prompted me to take a look at the Image Processing Toolbox function checkerboard. I =... read more >>

Today I want to take the test pattern I created last time and subject it to a variety of frequency-based filters. In this post I'll be using a variety of frequency design and... read more >>

Earlier today I told you that I was feeling a little dense because I couldn't figure out the right parameters to use in the tanh term of this test pattern: (This is... read more >>

Last week I talked about the so-called Jähne test pattern and how I found a description of it in Practical Handbook on Image Processing for Scientific Applications, by Bernd Jähne, CRC... read more >>

The July 2011 issue of MATLAB Digest is out, and an article by Martin Knapp-Cordes and Bill McKeeman caught my eye. It describes improvements to the MATLAB tic and toc functions. It also describes... read more >>

Earlier this week I posted a summary of posts from the beginning of this blog, including my January 13, 2006 post on generating test images. Today I want to revisit one of the examples from that... read more >>

It's hard for me to believe, but I started writing this blog just over five years ago. I'm going to start occasionally recapping old blog posts, especially those with content that is... read more >>

A few months ago, MATLAB user Julia asked how to "fill 4-connected pixels exclusively" on MATLAB Answers. Here's a more precise statement of the problem: if a zero-valued pixel in a binary... read more >>

Blog reader Mutlu recently asked me this question: "I have two images - one contains class labels (one of 1 or 2) and one containing image segment (region) unique IDs. I am ... read more >>

R2011a shipped back in April, but I haven't said too much about it, yet. I mentioned the new geotiffwrite function in Mapping Toolbox (18-Apr-2011 post), and I discussed the improved performance... read more >>