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Bit slices
Blog reader Kathirvel wanted to know more about the MATLAB default image and how it was formed. I'll show...
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Nonflat grayscale dilation and erosion
Blog reader Alex asked for an explanation of nonflat grayscale dilation and erosion. In the most commonly-used form...
plus de 19 ans il y a
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Software development tools for engineers
Back in September I wrote that I would be attending the IEEE International Conference on Image Processing this month, and...
plus de 19 ans il y a
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Getting MATLAB code from blog postings
Back in January, I wrote that I was using the MATLAB publish feature to generate some of my blog posts. Since then, I've...
plus de 19 ans il y a
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Hough transform coordinate system
Reader JP asked me about my recent blog post on the Hough transform. Specifically, she wanted to know exactly how the...
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The Story Behind the MATLAB Default Image
Image display was added in version 4 of MATLAB, sometime around 1990. Many observant users noticed that the...
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Separable convolution
The sci.image.processing newsgroup had a discussion this week on separable filters, which reminded me that...
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Dilation, erosion, and the morphological gradient
The morphological operator dilation acts like a local maximum operator. Erosion acts like a local minimum...
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Unusual red-eye reduction technique
I was amused by this portion of a product description for a digital camera. I'm not sure that this is what I would expect...
plus de 19 ans il y a
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Use makehgtform for 3-D rotation
Developer Mike G. read my recent post about three-dimensional image rotation and suggested that users might want to use...
plus de 19 ans il y a
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ICIP 2006
The thirteenth International Conference on Image Processing (ICIP) is next month in Atlanta, Georgia. I'll be attending to...
plus de 19 ans il y a
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R2006b
If you look closely at the bottom of my last post, you'll see "Published with MATLAB 7.3" in small gray text. Yep, the...
plus de 19 ans il y a
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Showing image pixels associated with a Hough transform bin
Someone here recently puzzled over the output of the Hough transform functions in the Image Processing Toolbox. The...
plus de 19 ans il y a
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Responses to reader challenge
Thanks to Kimo Johnson and Perttu Ranta-aho for responding to my custom spatial transformation challenge. ...
plus de 19 ans il y a
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Spatial transformations: Three-dimensional rotation
Blog reader Stephen N., who's been following my posts about spatial transformations, asked me last week how to...
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Discrete cosine transforms, JPEG, and software compatibility
Software compatibility is a tricky subject. No one likes it when an incompatible change occurs in a software...
plus de 19 ans il y a
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Reader challenge: Custom spatial transformations
Were you intrigued by the custom spatial transformations I showed last week? Here's a challenge for you: Create a sample...
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Spatial transformations: Defining and applying custom transforms
Blog reader David A. asked me a while back about how to transform an image based on some mathematical function. For...
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Spatial transformations: Controlling the input and output grids with imtransform
The function imtransform has several optional parameters that allow you to fine-tune its behavior. Today's...
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Spatial transformations: Handling noninvertible cases
I've written previously about how imtransform uses inverse mapping to compute the input-space location corresponding to...
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GUI programming questions
I regularly receive blog comments and direct e-mail asking for help with writing image processing GUIs in MATLAB. That's...
plus de 19 ans il y a
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Seen on the web: MATLAB example for tracing and measuring skin lesions
I saw an interesting MATLAB based image processing application on a melanoma skin cancer blog recently. The example,...
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Input from tech support
Recently, our application support engineers gave a series of presentations to development groups. These presentations...
presque 20 ans il y a
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Spatial transformations: Translation confusion
The last time I wrote about spatial transformations, I explained that imtransform uses the function findbounds to...
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Multidimensional interpolation with integer input
A customer asked me last week how to do multidimensional interpolation with integer inputs. The MATLAB function interpn...
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More from CGIV
More bits and pieces from CGIV today, typed in while watching England and Sweden battle it out on the telly... it's...
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Hue shifts near the L*=0 axis
At the European Colour in Graphics, Imaging, and Vision conference today, I took a tutorial called "Transforms for...
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European colour
Next week I'll be in the UK. On Monday I'll be attending the International Color Consortium's DevCon 2006 at the...
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Spatial transformations: findbounds
I've written previously about how Image Processing Toolbox uses inverse mapping to implement spatial transforms. In...
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Determining point positions in MRI peg phantom
Blog reader Jonathan from St. Jude Children's Research Hospital sent me an image derived from an MRI peg phantom:bw...
presque 20 ans il y a
