Steve on Image Processing with MATLAB

Image processing concepts, algorithms, and MATLAB

Posts 561 - 570 of 597

Determining point positions in MRI peg phantom 38

Blog reader Jonathan from St. Jude Children's Research Hospital sent me an image derived from an MRI peg phantom:bw =... read more >>

Batch processing 72

23-Jun-2015 update: See the new Image Batch Processor App (added to R2015a) and my blog post about it. A couple of months ago I was working with a bunch of pictures I had taken at... read more >>

Cell segmentation 119

Blog reader Ramiro Massol asked for advice on segmenting his cell images, so I gave it a try. I'm not a microscopy expert, though, and I invite readers who have better suggestions than... read more >>

A little deadline pressure

In a recent comment, blog reader Ramiro asks where I've been for the last couple of weeks. Well, I've been right here at my desk, working hard in advance of critical R2006b development deadlines.... read more >>

Spatial transformations: Where is the output image? 7

I wrote previously that most spatial image transformation implementations use inverse mapping. The Image Processing Toolbox function imtransform is implementated using this technique. Here's... read more >>

A Lab-based uniform color scale 40

DSP Tips & Tricks One of my favorite professional publications is IEEE Signal Processing Magazine. It has a regular feature called "DSP Tips & Tricks." In the January... read more >>

Spatial transformations: Inverse mapping 19

I wrote last week about the forward mapping method of spatially transforming images. Because of the disadvantages of the forward mapping method, most of the practical implementations use a... read more >>

Fast local sums

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 >>

Spatial transformations: Forward mapping 11

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 >>

Quick tip: Determining uniqueness of local maximum 15

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 >>

Posts 561 - 570 of 597

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