Steve on Image Processing

Concepts, algorithms & MATLAB

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MATLAB arithmetic expands in R2016b

Posted by Steve Eddins,

Earlier this summer, I was writing some color-space conversion code. At one point in the code, I had a Px3 matrix called RGB, which contained P colors, one per row. I also had a 1x3 vector, v. I needed to multiply each column of RGB by the corresponding element of... read more >>

Filling holes in outline text 7

Posted by Steve Eddins,


Intrepid MathWorks application engineer Brett Shoelson recently got a user question that caught my attention. Consider an image containing text characters in outline form, such as this:... read more >>

Getting the math right 9

Posted by Steve Eddins,

Because I work regularly with developers on the MATLAB Math team, I see the questions that come to them from tech support. Today there was an interesting one.... read more >>

Ten years of MATLAB blogging 3

Posted by Steve Eddins,

As I mentioned last time, MATLAB Central is celebrating its 15th anniversary. You should head on over there to try one of the two contests, the Scavenger Hunt and the Triathlon. Or compete in both!... read more >>

Binary image area filtering

Posted by Steve Eddins,


In my August 8 post about Pokemon Go (and I still can't quite believe that I did that), one of the processing steps was finding the centroid of the largest object in a binary image.... read more >>

Pokémon Go meets MATLAB

Posted by Steve Eddins,

Until about two weeks ago, I had given absolutely no thought to the possibility of a relationship between MATLAB and Pokémon Go, this summer's worldwide mobile gaming phenomenon. But then I heard about someone using some basic image processing techniques to hack the game by automating the search for PokéStops.... read more >>

Image binarization – Otsu’s method 2

Posted by Steve Eddins,


In my 16-May-2016 post about image binarization, I talked about the new binarization functions in R2016a. Today I want to switch gears and talk about Otsu's method, one of the algorithms underlying imbinarize.... read more >>