Note See the 09-Jan-2023 post for updated information about this topic, including a discussion of integral images and integral box filtering. The Image Processing Toolbox function... read more >>

I've written previously about defining a spatial transform as a function, (x,y) = T{(u,v)}, that maps points from one space (input space) to another (output space). Given such a function, how do... read more >>

A MATLAB user asked me how to determine which image pixels had local maxima that weren't unique. My answer involves a creative use of ordfilt2. Let's review first the concept... read more >>

This week I wrote the last in a series of postings that discussed how MATLAB associates matrix values with specific screen pixel colors. The series talked about the two fundamental image display... read more >>

In my previous postings on this topic, I've discussed the basic image display models in MATLAB - truecolor and indexed. The Image Processing Toolbox has conventions for two additional image... read more >>

The MathWorks does not normally preview unreleased features, but I thought this might be a good time to make an exception. We are very excited about a set of new performance optimizations we are... read more >>

Note For new or updated information about this topic, see: How to Overlay a Color on an Image Using a Mask (03-Dec-2019) Contents Image Overlay ... read more >>

All I've been doing this week is writing. Unfortunately, I haven't been writing blog postings. Between my other work responsibilities and an upcoming trip, I have almost no time left for this blog... read more >>

If you are like me, you never remember to check web sites you are following for new content. I prefer to be automatically notified, somehow, whenever something new is posted. For blogs and other... read more >>

I've received some comments and e-mail asking how to apply the spatial transformation ideas I've been writing about to images. When I started this series, I naively assumed that Image Processing... read more >>