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Counting occurrences of image colors
Blog reader André recently asked me how to count the number of times each color appears in an image. One short...
environ 18 ans il y a
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JPEG: What’s in a name?
Hi folks. If you want to learn a bit about the many compression methods and file formats that all share the name JPEG,...
environ 18 ans il y a
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Logical indexing
This is the first post in a short series on index techniques that are particularly useful for image processing in...
environ 18 ans il y a
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linkaxes
Toward the end of last year, it occurred to me that I had accumulated enough material on this blog to construct a...
environ 18 ans il y a
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A Second Year of Blogging
Happy New Year everyone! I just wrapped up a second year of blogging about image processing in MATLAB. I write...
environ 18 ans il y a
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Cleaning up scanned text – revisited
Have you ever used the distance transform? For a binary image, the distance transform is the distance from every...
plus de 18 ans il y a
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METACOW
How can I possibly resist the opportunity to post about something called METACOW? The Munsell Color Science...
plus de 18 ans il y a
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Remembering Gene Golub, 1932 – 2007
The book Matrix Computations by Gene Golub and Charles Van Loan sits on the bookshelves of many MathWorks employees. ...
plus de 18 ans il y a
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Cleaning up scanned text
Earlier this year I exchanged e-mail with blog reader Craig Doolittle. Craig was writing MATLAB scripts to clean up...
plus de 18 ans il y a
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GUI debugging video – recommended
Doug posted a recorded GUI debugging session on his Pick of the Week blog. If you want to pick up some GUI programming...
plus de 18 ans il y a
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General connectivity
The notion of neighbor connectivity is discussed in most image processing textbooks. Specifically, what is the set of...
plus de 18 ans il y a
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Classification of operations
In image processing textbooks, you often see low-level image processing operations grouped into two categories: ...
plus de 18 ans il y a
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From the archives: All about pixel colors
When I started this blog in early 2006, one of my first series of articles was called "All About Pixel Colors." These...
plus de 18 ans il y a
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Image deblurring – Wiener filter
I'd like to welcome back guest blogger Stan Reeves, professor of Electrical and Computer Engineering at Auburn...
plus de 18 ans il y a
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Can you share an MMT with us?
Note added July 30, 2008: See this post for an update. In September I wrote about customer-reported speed issues...
plus de 18 ans il y a
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bwselect
Didja know about the Image Processing Toolbox function bwselect? For a blog post I wrote earlier this month, I...
plus de 18 ans il y a
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Upslope area – Summary
Back in March I started writing about an algorithm implementation experiment for computing upslope area. Given an "image"...
plus de 18 ans il y a
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Finding bright objects
In a blog comment earlier this summer, someone asked how to find "which labeled regions have a bright spot greater than...
plus de 18 ans il y a
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Upslope area – handling NaNs
Since I originally posted my upslope toolbox to MATLAB Central back in August, I have heard from some experts about an...
plus de 18 ans il y a
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Category and archive links
We recently changed the view when you click on a category in the sidebar on the right. I haven't used categories much, but...
plus de 18 ans il y a
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Upslope area – vectorizing pixel flow calculations
At the beginning of the upslope area series, I posted code showing how to compute the direction of maximum slope for a...
plus de 18 ans il y a
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HDR and tone mapping links
In photography and color science, MathWorks developer Jeff Mather's personal interests intersect with his work. He...
plus de 18 ans il y a
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Upslope area – influence and dependence maps
In my August 7th post on upslope area, I showed how to construct and solve the flow matrix to determine the upslope...
plus de 18 ans il y a
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Major image processing product updates
At the International Conference on Image Processing last week, almost everyone who visited the MathWorks booth was already a...
plus de 18 ans il y a
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How many images can fit in a TIFF file?
Note added July 30, 2008: See this post for an update. In a comment on my R2007b post last week, Vincent wanted to...
plus de 18 ans il y a
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ICIP 2007
For the next few days, I'll be at the IEEE International Conference on Image Processing in San Antonio, Texas. If you're...
plus de 18 ans il y a
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R2007b
Sharp-eyed readers of my previous post might have noticed the "Published with MATLAB® 7.5" footer at the end of the...
plus de 18 ans il y a
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Clearing border components
I saw an application recently where someone wanted to handle NaNs in an image differently depending on whether they...
plus de 18 ans il y a
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Intensity-weighted centroids
One the measurements provided by regionprops is 'Centroid'. Here's an example of labeling binary objects, computing...
plus de 18 ans il y a
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Upslope area – handling plateaus, revisited
Earlier in this series I have discussed the problem of plateaus. Specifically, how do you assign a flow direction to a...
plus de 18 ans il y a
