Steve on Image Processing

January 16th, 2009

This month finishes a third year for me of blogging about image processing algorithms, working with images in MATLAB, and more.

Topics this past year included:

• A series of tutorials on MATLAB indexing, from basic to very advanced (logical indexing, linear indexing, neighbor indexing)
• Tips and code for measuring function speed in MATLAB
• Addressing common user questions about popular functions (such as search order and object relabeling with bwlabel)
• Updates on new releases
• A series on using lookup tables to implement neighborhood operations on binary images (in May and June)
• Various image visualization techniques (output of bwlabel, binary image objects, using transparency)
• Useful operations that I fear no one knows about (opening by reconstruction)
• Fun tricks with imfilter
• A series on how some image dilation algorithms work
• Pseudorandom musings (reconsidering the impossible, an Escher chess puzzle, software testing)

Be sure to check out the blog archives link on the right side of the page for a complete list of blog postings for the past three years. There's lot of good information there.

So what's coming up next? Well, I don't know exactly. I have a fairly long list of topic possibilities, some specific and some still pretty vague. My simple theory about making a blog like this work is to write about things that I find personally interesting and rewarding, and then to pray that at least a half-dozen other people find some of it interesting, too. Mostly, I'm interested in how image processing algorithms work, as well as MATLAB techniques that are particularly effective and useful for working with image data. I've also written occasionally about aspects of software development.

Do you have any ideas for topics you'd like to see discussed here? Please share them by leaving a comment. And thanks!

21:56 UTC | Posted in Uncategorized | Permalink |

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4 Responses to “A Third Year of Blogging”

1. Anton Semechko replied on January 22nd, 2009 at 13:44 UTC :
   

   Hi Steve, I have a suggestion for a topic for one of your blogs. Image registration but with more emphasis on nonlinear types of transformations.

2. Steve replied on January 22nd, 2009 at 13:50 UTC :
   

   Anton—Thanks for the suggestion.

3. Greg replied on January 27th, 2009 at 00:00 UTC :
   

   Please consider “uneven illumination” as a topic for this blog. Consider removing the halo/spotlight effect when taking a flash photo of a printed page where the paper is brown or gray. I’ve done this with a point and shoot 6mp canon with exposure set to -2 (to minimize the flash washing out the text), ISO 100, grayscale. Upsampling and converting to black and white as a post processing step would be nice. This can be approached as fixing illumination or ‘background subtraction’.

4. Steve replied on January 27th, 2009 at 13:48 UTC :
   

   Greg—Thanks for the suggestion. You might want to look at the nonuniform illumination demo in the Image Processing Toolbox. Click on the Demos link under “Image Processing Toolbox” on the right side of this page.

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