Happy New Year!I'm going to kick off 2017 with two or three posts about antialiasing. Specifically, I will discuss what antialiasing means in the context of image resizing, and I will explain how the... 続きを読む >>
Aliasing and image resizing – part 1
Steve on Image Processing with MATLABImage processing concepts, algorithms, and MATLAB
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MATLAB arithmetic expands in R2016b
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... 続きを読む >>
Filling holes in outline text 7
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:url =... 続きを読む >>
Getting the math right 9
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.A user observed that computing the sin... 続きを読む >>
Ten years of MATLAB blogging 3
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... 続きを読む >>
The MATLAB community and me 3
As Ned Gulley posted over on the MATLAB Community blog last week, MATLAB Central is 15 years old. Ned commented that MATLAB Central was “giving a modern web-based home to a community that... 続きを読む >>
Binary image area filtering
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.That reminded me... 続きを読む >>
Pokémon Go meets MATLAB
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... 続きを読む >>
Ineffective preallocation 5
Today I want to explain a MATLAB coding mistake that I have seen even experienced MATLAB users make.I was looking at some code on the File Exchange recently, and these lines caught my eye:cm_data =... 続きを読む >>
Adaptive thresholding for binarization
Despite recent appearances on the blog, I still exist! It's just been a little crazier than usual for the last month or so.Anyway ... I'm back, and I'm going to try to wrap things up about image... 続きを読む >>