Hi
Just wanted to share a thing I made – a simple 2D hand pose estimator, using a skeleton model fitting. Basically there has been a crap load of work on hand pose estimation, but I was inspired by this ancient work. The problem is setting out to find a good solution, and everything is very hard to understand and implement. In such cases I like to be inspired by a method, and just set out with my own implementation. This way, I understand whats going on, simplify it, and share it with you!
Anyway, let’s get down to business.
Edit (6/5/2014): Also see some of my other work on hand gesture recognition using smart contours and particle filters
On one of my Android apps, I added a trivial option to select a contact from the phone’s contact list. This was working fine until SDK version 5, which changed the way the contacts are represented in the phone’s SQLite database. It is using the “newer” class called ContactsContract instead of the deprecated People class
I have spent quite time in order to figure out which was the best way that will fit my needs. If you are in the same position, feel free to use the code below
My example below is will display a two row list of all the contacts, with alphabetical indexing. It is a mixture of code snippets I have found on the net, while may not be optimized; it will definitely give you the hang of things.
Hi
Another quicky on how to use Kinect (libfreenect) with OpenCV 2.1. I already saw people do it, but havn’t seen code.
UPDATE (12/29): OpenKinect posted very good C++ code of using libfreenect with OpenCV2.X APIs: here it is. Plus, their git repo now has a very clean C code: here it is.
So here it goes
Categories
Hacking together a Kinect port
Hi,
Just a quicky on how I hacked together a DIY Microsoft Kinect port. The Kinect port is non standard, USB-like port, and to actually connect it to a PC you must buy an adapter from microsoft for >30$. This is whack. You should make your own. All you need is access to a lasercutter, vinylcutter, plexiglass 1/8″, some copper sheet and solder equip.
Hi,
Just wanted to share a bit of code using OpenCV’s camera extrinsic parameters recovery, camera position and rotation – solvePnP (or it’s C counterpart cvFindExtrinsicCameraParams2). I wanted to get a simple planar object surface recovery for augmented reality, but without using any of the AR libraries, rather dig into some OpenCV and OpenGL code.
This can serve as a primer, or tutorial on how to use OpenCV with OpenGL for AR.
Update 2/16/2015: I wrote another post on OpenCV-OpenGL AR, this time using the fine QGLViewer – a very convenient Qt OpenGL widget.
The program is just a straightforward optical flow based tracking, fed manually with four points which are the planar object’s corners, and solving camera-pose every frame. Plain vanilla AR.
Well the whole cpp file is ~350 lines, but there will only be 20 or less interesting lines… Actually much less. Let’s see what’s up
Android + Yourmuze.fm + Dolphin Browser HD + XiiaLive = WIN
It’s been a while since I’ve posted anything in the blog… Sorry for that… very busy times. I had a lot of ideas of what my “comeback post” should be about, but I knew I had to share one of my relatively recent discoveries that made my smartphone online-radio listening experience a whole lot better
If you don’t know yourmuze.fm, this might be the time to get to know it. It’s a free service that has a LOT of worldwide radio stations available as an online stream for usage with most of the smartphones.
In order to start using it you need to register for free via your desktop computer, and add the stations you like. Later on, you can surf to the mobile version of the service by mobile web and listen to the stations you selected.
So far so good… I like it. But how about multitasking?
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.
Hi,
Just a quicky about OpenCV and Windows Presentation Framework interoperability. It’s really easy with a simple Managed C++ wrapper. What I’ll show is how to transfer an OpenCV cv::Mat into WPF’s BitmapSource. Let’s see how it’s done.
Hi,
I’ll present a quick and simple implementation of image recoloring, in fact more like color transfer between images, using OpenCV in C++ environment. The basis of the algorithm is learning the source color distribution with a GMM using EM, and then applying changes to the target color distribution. It’s fairly easy to implement with OpenCV, as all the “tools” are built in.
I was inspired by Lior Shapira’s work that was presented in Eurographics 09 about image appearance manipulation, and a work about recoloring for the colorblind by Huang et al presented at ICASSP 09. Both works deal with color manipulation using Gaussian Mixture Models.
Update 5/28/2015: Adrien contributed code that works with OpenCV v3! Thanks! https://gist.github.com/adriweb/815c1ac34a0929292db7
Let’s see how it’s done!
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 a larger and noisy set in which we would like to find the object. The basic algorithm is described very briefly in wikipedia, but there are a ton of papers on the subject.
I’ll take you through the steps of programming it with OpenCV.