Tag Archive: opengl

Apr 24

WTH OpenGL 4? Rendering elements arrays with VAOs and VBOs in a QGLWidget

Simple example usage of OpenGL 4 and vertex array / vertex buffer rendering in a Qt QGLWidget.

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Mar 16

Bootstrapping planar AR and tracking without markers [w/code]

Years ago I wanted to implement PTAM. I was young and na├»ve Well I got a few moments to spare on a recent sleepless night, and I set out to implement the basic bootstrapping step of initializing a map with a planar object - no known markers needed, and then tracking it for augmented reality …

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Oct 17

Head Pose Estimation with OpenCV & OpenGL Revisited [w/ code]

Using Perspective-N-Point to get the position and orientation of a human head, with basic OpenCV and OpenGL.

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Dec 20

Spherical harmonics face relighting using OpenCV, OpenGL [w/ code]

Implementing a face image relighting algorithm using spherical harmonics, based on a paper written by Wang et al (2007).

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Dec 02

A Kinect browser plugin with FireBreath [w/ code]

Hi, Just reporting on a small achievement, part of a big project: Creating a browser plugin to display the Kinect depth map on screen. The integration was fairly easy, which leads me to think that both FireBreath and OpenNI/Nite are pretty neat framework that are robust.. So let's see how it's done

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Oct 30

A GLSL shader showing the normal map [w/ code]

Screen shot 2011-10-30 at 11.13.48 AM

A very simple thing, although I couldn't find on Google some place to copy-paste off, so here it is:

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Jun 05

A motion parallax screen using Kinect [w/ code]

How to create a motion-parallax screen using Kinect head tracking. Code in C++, using OpenGL and OpenNI's skeleton model.

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Nov 10

20-lines AR in OpenCV [w/code]

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. …

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Mar 19

Quick and Easy Head Pose Estimation with OpenCV [w/ code]

j5

Update: check out my new post about this http://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 methods. …

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Mar 06

Implementing PTAM: stereo, tracking and pose estimation for AR with OpenCV [w/ code]

frames_correl

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 …

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