Steve on Image Processing

Concepts, algorithms & MATLAB

Results for: 2006

Colorful anniversaries in 2006 2

Posted by Steve Eddins,

[Guest blogger Jeff Mather, a developer on the Image and Geospatial team, is also an avid amateur photographer. He published this essay on his personal blog earlier this year and graciously allowed me to reproduce it here. Thanks, Jeff.] ... read more >>

POLY2MASK and ROIPOLY – Part 3

Posted by Steve Eddins,

This is the final post in a series discussing the algorithm underlying Image Processing Toolbox functions poly2mask and roipoly. (See Part 1 and Part 2.) ... read more >>

B = PCS 3

Posted by Steve Eddins,

Every now and then, a visitor to my office will ask, "Hey, what does that equation on your whiteboard mean?" ... read more >>

Getting MATLAB code from blog postings – An update 6

Posted by Steve Eddins,

Loren and I frequently use the MATLAB publish feature to create our blog posts. Back in October, we started using some JavaScript in our blogs so you could click on a link to get the original MATLAB code. (Look for a link that says "Get the MATLAB code")... read more >>

POLY2MASK and ROIPOLY – Part 2

Posted by Steve Eddins,

I'm familiar with two basic ways to determine whether a point is inside a polygon. The first is to compute the winding number, which is the number of times that a closed curve encircles the point. This technique is used by the MATLAB function inpolygon. ... read more >>

POLY2MASK and ROIPOLY – Part 1 19

Posted by Steve Eddins,

This is the first of several blogs about the algorithm behind poly2mask and roipoly. poly2mask takes a set of polygon vertices and produces a binary mask image. The binary mask has 1s for pixels inside the polygon and 0s for pixels outside. ... read more >>

3-D blood vessel tracing 2

Posted by Steve Eddins,

We had a visitor from Harvard Medical School and Massachusetts General Hospital here at MathWorks headquarters in November. Alex Tyrrell is a postdoctoral fellow at the Edwin Steele Laboratory there. Alex gave a presentation in which he showed some fascinating videos, created using MATLAB, of a three-dimensional automatic blood... read more >>