One of my favorite aspects of MATLAB for image processing is how I can use a binary image to index directly into a grayscale image. The technique is called logical indexing, and I'm going to show you... 続きを読む >>

With the R2015a release a couple of years ago, the Image Processing Toolbox added the function imgaussfilt. This function performs 2-D Gaussian filtering on images. It features a heuristic that... 続きを読む >>

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... 続きを読む >>

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.I'll use a 1-D sequence to... 続きを読む >>

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 >>

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 >>

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 >>

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 >>

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 >>

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 >>