I saw an application recently where someone wanted to handle NaNs in an image differently depending on whether they were "interior." In other words, a set of connected NaN pixels... 続きを読む >>

One the measurements provided by regionprops is 'Centroid'. Here's an example of labeling binary objects, computing the centroid of each object, and plotting the centroid location on top... 続きを読む >>

The functions bwlabel and regionprops are very useful for measuring the properties of shapes in a binary image. There are documentation examples and product demos showing how to do this,... 続きを読む >>

Didja know? You can fill holes, or pits, in grayscale images by using the Image Processing Toolbox function imfill. The other day I was rereading the Tarboton paper on upslope area,... 続きを読む >>

In March 2006 I wrote about how to overlay a specified color onto specified pixels of a grayscale or RGB image. I put a utility function (imoverlay) for performing this... 続きを読む >>

The June 22, 2007 issue of Science magazine contains the article "Quantitative Morphological Signatures Define Local Signaling Networks Regulating Cell Morphology," by Chris Bakal, John Aach,... 続きを読む >>

I'm blogging from vacation today, so here's a fun topic for you to consider. (As far as I know it has nothing to do with MATLAB.) What are your favorite movies or TV shows in which image... 続きを読む >>

Didja know? Functions imfinfo and imread do not depend exclusively on the filename extension (for example, .jpg, .png, .tif, etc.) to determine the image file format. I thought about this because a... 続きを読む >>

Here's a quick tip. A user question came in recently that involved a step of finding the pixels adjacent to foreground pixels in a binary image. Suppose you have a binary mask image,... 続きを読む >>

MathWorks developer Dave L. created an Intruder Detection example to demonstrate how Image Acquisition Toolbox and Data Acquisition Toolbox can work together. The program displays live video and... 続きを読む >>