Steve on Image Processing

Concepts, algorithms & MATLAB

Aliasing and image resizing – part 3 1

Posted by Steve Eddins,

antialiasing_3_05

Today I'll try to wrap up my discussion about how aliasing affects image resizing and about how the imresize function tries to prevent it. (This is called antialiasing.) Let me show you where we are going. Here is the zone plate image I showed last time.... read more >>

Aliasing and image resizing – part 2 7

Posted by Steve Eddins,

In my 03-Jan-2017 post, I introduced my new topic: aliasing, especially as it relates to resizing images. Today I will get more specific about what aliasing actually is.... read more >>

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,

filling_text_holes_06

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,

area_filtering_06

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 >>

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