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A simple object classifier with Bag-of-Words using OpenCV 2.3 [w/ code] Just wanted to share of some code I’ve been writing. So I wanted to create a food classifier, for a cool project down in the Media Lab called FoodCam. It’s basically a camera that people put free food under, and they can send an email alert to the entire building to come eat (by pushing a huge button marked “Dinner Bell”). Rea

Iterative Closest Point (ICP) for 2D curves with OpenCV [w/ code] ICP – Iterative closest point, is a very trivial algorithm for matching object templates to noisy data. It’s also super easy to program, so it’s good material for a tutorial. The goal is to take a known set of points (usually defining a curve or object exterior) and register it, as good as possible, to a set of other points, usually

OpenCV2.1 on Android quickey with Haar object detection [w/ code] Hi! Long time no post… MIT is kicking my ass with work. But it was amazing to come back to so many comments with people anxious to get OpenCV going mobile! Anyway, just wanted to share my work on object detection using OpenCV2.1 on the Android. Although it seems like a trivial task, since you can just compile OCV2.1 as native lib an

Update: check out my new post about this https://www.morethantechnical.com/2012/10/17/head-pose-estimation-with-opencv-opengl-revisited-w-code/ Hi Just wanted to share a small thing I did with OpenCV – Head Pose Estimation (sometimes known as Gaze Direction Estimation). Many people try to achieve this and there are a ton of papers covering it, including a recent overview of almost all known method

Implementing PTAM: stereo, tracking and pose estimation for AR with OpenCV [w/ code] Hi Been working hard at a project for school the past month, implementing one of the more interesting works I’ve seen in the AR arena: Parallel Tracking and Mapping (PTAM) [PDF]. This is a work by George Klein [homepage] and David Murray from Oxford university, presented in ISMAR 2007. When I first saw it on youtu

Hi I saw the stats for the blog a while ago and it seems that the augmented reality topic is hot! 400 clicks/day, that’s awesome! So I wanted to share with you my latest development in this field – cross compiling the AR app to the iPhone. A job that proved easier than I originally thought, although it took a while to get it working smoothly. Basically all I did was take NyARToolkit, compile it fo

Near realtime face detection on the iPhone w/ OpenCV port [w/code,video] Hi OpenCV is by far my favorite CV/Image processing library. When I found an OpenCV port to the iPhone, and even someone tried to get it to do face detection, I just had to try it for myself. In this post I’ll try to run through the steps I took in order to get OpenCV running on the iPhone, and then how to get OpenCV’s face d