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Colormap Test Image
Today I want to tell you how and why I made these images: After the MATLAB R2014b release, I wrote several blog posts (Part...
plus de 8 ans il y a
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Customizing REGIONPROPS With Your Own Measurements
I saw a presentation last month that mentioned a user request to have the ability to customize regionprops. That is, a user...
plus de 8 ans il y a
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Frequency Samples for the Output of FFT2
A MATLAB user recently contacted tech support with a question about the output of fft2. The user had a function, q(x,y),...
plus de 8 ans il y a
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Chessboards, Implicit Expansion, REPELEM, and Unicode Chess Queens
A few weeks ago, I wrote about a solver algorithm for the Eight Queens Problem. The post included diagrams like this one....
plus de 8 ans il y a
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The Eight Queens Problem – Generating All Solutions
On April 20, I wrote about an algorithm for solving the Eight Queens Problem. In this problem, the task is to place eight...
presque 9 ans il y a
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The Future of String Arrays in MATLAB
At MathWorks, we almost never talk in detail about product features before they are released. That's why this week's Art of...
presque 9 ans il y a
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The Eight Queens Problem
Today I want to tackle a classic algorithm puzzle known as the Eight Queens Problem. In this problem, your task is to...
presque 9 ans il y a
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Variation on Connected Objects – Using Graphs
Reader Uri Pe'er found an old post from 2011 about shortest paths in binary images, and he asked this follow-up question...
presque 9 ans il y a
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Variations on Connected Objects – Using imfill
Reader Uri Pe'er found an old post from 2011 about shortest paths in binary images, and he asked this follow-up question...
presque 9 ans il y a
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Logical indexing
One of my favorite aspects of MATLAB for image processing is how I can use a binary image to index directly into a grayscale...
presque 9 ans il y a
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Gaussian filtering with imgaussfilt
With the R2015a release a couple of years ago, the Image Processing Toolbox added the function imgaussfilt. This function...
environ 9 ans il y a
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Aliasing and image resizing – part 3
Today I'll try to wrap up my discussion about how aliasing affects image resizing and about how the imresize function tries...
environ 9 ans il y a
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Aliasing and image resizing – part 2
In my 03-Jan-2017 post, I introduced my new topic: aliasing, especially as it relates to resizing images. Today I will get...
environ 9 ans il y a
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Aliasing and image resizing – part 1
Happy New Year!I'm going to kick off 2017 with two or three posts about antialiasing. Specifically, I will discuss what...
environ 9 ans il y a
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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...
plus de 9 ans il y a
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Filling holes in outline text
Intrepid MathWorks application engineer Brett Shoelson recently got a user question that caught my attention. Consider an...
plus de 9 ans il y a
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Getting the math right
Because I work regularly with developers on the MATLAB Math team, I see the questions that come to them from tech support....
plus de 9 ans il y a
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Ten years of MATLAB blogging
As I mentioned last time, MATLAB Central is celebrating its 15th anniversary. You should head on over there to try one of...
plus de 9 ans il y a
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The MATLAB community and me
As Ned Gulley posted over on the MATLAB Community blog last week, MATLAB Central is 15 years old. Ned commented that...
plus de 9 ans il y a
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Friday MATLAB Mystery
Who can tell me the significance of this number: 0.814723686393179 Update: 29-Aug-2016 Sven and Sam are...
plus de 9 ans il y a
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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...
plus de 9 ans il y a
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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...
plus de 9 ans il y a
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Friday MATLAB Mystery
There are some MathWorkers who like to try to stump each other with pictures of "mystery items." For example, last week...
plus de 9 ans il y a
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Ineffective preallocation
Today I want to explain a MATLAB coding mistake that I have seen even experienced MATLAB users make.I was looking at some...
plus de 9 ans il y a
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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...
plus de 9 ans il y a
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Image binarization – Otsu’s method
In my 16-May-2016 post about image binarization, I talked about the new binarization functions in R2016a. Today I want to...
plus de 9 ans il y a
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Image binarization – new R2016a functions
In my 09-May-2016 post, I described the Image Processing Toolbox functions im2bw and graythresh, which have been in the...
presque 10 ans il y a
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Image binarization – im2bw and graythresh
As I promised last time, I'm writing a series about functional designs for image binarization in the Image Processing...
presque 10 ans il y a
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Image binarization – new functional designs
With the very first version of the Image Processing Toolbox, released more than 22 years ago, you could convert a gray-scale...
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Problem complexity
Twice in the last month, I have read comments about certain problems being intrinsically hard to solve. In a fascinating...
presque 10 ans il y a