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The DFT and the DTFT
It's finally time to start looking at the relationship between the discrete Fourier transform (DFT) and the...
environ 16 ans il y a
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Aliasing and a sampled cosine signal
One challenge of teaching Fourier transform concepts is that each concept can be (and is) interpreted and explained in...
environ 16 ans il y a
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Aliasing and the discrete-time Fourier transform
Many of you were onto me immediately last week. I asked you to estimate the frequency of the sampled cosine signal...
environ 16 ans il y a
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Sampling a cosine
I know, I know ... I've really fallen behind in my blog posting the last month or so. Shifting responsibilities in my...
environ 16 ans il y a
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Updates on old business: upslope area and unit testing
A couple of papers have been published recently that are related to some of my old blog topics. Almost exactly a...
environ 16 ans il y a
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Relationship between continuous-time and discrete-time Fourier transforms
Previously in my Fourier transforms series I've talked about the continuous-time Fourier transform and the...
environ 16 ans il y a
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About the unused-argument syntax in R2009b
Last fall Loren wrote a blog post about a new syntax in R2009b for ignoring function inputs or function outputs. For...
environ 16 ans il y a
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In my mailbox this week: MCALab, astronomy, dmperm, and Sudoku
Some interesting IEEE articles arrived in my mailbox this week. Computing in Science and Engineering has "MCALab:...
environ 16 ans il y a
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Discrete-time Fourier transform (DTFT)
In the last two posts in my Fourier transform series I discussed the continuous-time Fourier transform. Today I want to...
environ 16 ans il y a
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Image Enhancement: A Medley
Can I post two silly-season items in one day? Hey, it's my blog, so why not! One of my posts that received the most...
plus de 16 ans il y a
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A very different take on the Fourier transform
This is my silly season entry (from...
plus de 16 ans il y a
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Continuous-time Fourier transform of windowed cosine
Last week I showed a couple of continuous-time Fourier transform pairs (for a cosine and a rectangular pulse). Today I...
plus de 16 ans il y a
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Continuous-time Fourier transform basics
In my planned (well, partially planned) discussion on Fourier transforms, I'll focus on three of the four types I...
plus de 16 ans il y a
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Example of Fourier terminology confusion
This exchange of comments between Cris and me (see comments 11-16) is a good example of the kind of terminology confusion...
plus de 16 ans il y a
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Fourier transform visualization using windowing
When I dipped my toe into the Fourier transform waters last week, the resulting comments and e-mail indicated there is...
plus de 16 ans il y a
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Fourier transforms
Confession time. When it comes to writing about Fourier transforms on this blog, I'm a chicken. (For my readers not...
plus de 16 ans il y a
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Extracting dot locations from a graphic
I was looking at the image below on a web page recently and I decided to extract the locations of all the dots. I...
plus de 16 ans il y a
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Maybe truecolor is OK after all
Yesterday I posted that I was looking for a replacement for the term truecolor. (I won't repeat the explanation here;...
plus de 16 ans il y a
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I’m looking for a replacement for “truecolor”
The Image Processing Toolbox has terminology conventions for four different image types: Binary...
plus de 16 ans il y a
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Writing TIFF files with given width and resolution
I received the following question recently: I'd like to be able to establish an image size that will be recognized...
plus de 16 ans il y a
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The conv function and implementation tradeoffs
A friend from my grad school days (back in the previous millenium) is an electrical engineering professor. Students in...
plus de 16 ans il y a
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Embedding an ICC profile into a TIFF file
The R2009b release of MATLAB contains a new Tiff class. The primary purpose of this class is to provide lower-level...
plus de 16 ans il y a
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Faster morphological reconstruction in R2009b
We've been working for a while now to make Image Processing Toolbox functions run faster. The R2009b release notes...
plus de 16 ans il y a
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Friday links
Contour tracing - tutorial and algorithms List of computer vision research groups worldwide Camera...
plus de 16 ans il y a
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MATLAB Virtual Conference – “the high point of geekism this year”
I spent all of yesterday interacting with visitors to the MATLAB Virtual Conference. It was great fun! A blogger wrote...
plus de 16 ans il y a
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Deploying Image Processing Toolbox apps in R2009b – we goofed
Ack! We discovered recently that we broke application deployment when using the MATLAB Compiler with Image...
plus de 16 ans il y a
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Friday links
Here are some end-of-the-week image processing links for you. Martian Polar Activity - tutorial illustrating the use of...
plus de 16 ans il y a
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Release notes for old versions
Last week Oliver asked for the release in which CMYK TIFF support was added to imwrite. Oliver then followed up asking for...
plus de 16 ans il y a
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MATLAB Virtual Conference on October 14
We're having a MATLAB "virtual conference" on October 14. There'll be presentations, live Q&A, roundtable discussions,...
plus de 16 ans il y a
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Tab completion for imread, imfinfo, and imwrite in R2009b
OK, I'm embarrassed that I didn't even know about this particular new feature in R2009b. Yesterday I was in another...
plus de 16 ans il y a
