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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...
alrededor de 18 años hace
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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,...
alrededor de 18 años hace
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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...
alrededor de 18 años hace
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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...
alrededor de 18 años hace
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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...
alrededor de 18 años hace
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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...
alrededor de 18 años hace
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METACOW
How can I possibly resist the opportunity to post about something called METACOW? The Munsell Color Science...
alrededor de 18 años hace
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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. ...
alrededor de 18 años hace
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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...
alrededor de 18 años hace
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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...
más de 18 años hace
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General connectivity
The notion of neighbor connectivity is discussed in most image processing textbooks. Specifically, what is the set of...
más de 18 años hace
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Classification of operations
In image processing textbooks, you often see low-level image processing operations grouped into two categories: ...
más de 18 años hace
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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...
más de 18 años hace
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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...
más de 18 años hace
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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...
más de 18 años hace
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bwselect
Didja know about the Image Processing Toolbox function bwselect? For a blog post I wrote earlier this month, I...
más de 18 años hace
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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"...
más de 18 años hace
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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...
más de 18 años hace
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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...
más de 18 años hace
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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...
más de 18 años hace
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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...
más de 18 años hace
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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...
más de 18 años hace
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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...
más de 18 años hace
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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...
más de 18 años hace
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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...
más de 18 años hace
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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...
más de 18 años hace
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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...
más de 18 años hace
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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...
más de 18 años hace
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Intensity-weighted centroids
One the measurements provided by regionprops is 'Centroid'. Here's an example of labeling binary objects, computing...
más de 18 años hace
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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...
más de 18 años hace
