Daniel Bardsley

A curious mix of personal shenanigans and computer vision research

3D Reconstruction and Recognition

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Accepted for publication in: Biometric Technology for Human Identification IV 2007

Download: 3D Reconstruction and Recognition (pdf)

In this paper we propose a novel 3D face recognition system. Furthermore we propose and discuss the development of a 3D reconstruction system designed specifically for the purpose of face recognition. The reconstruction subsystem utilises a capture rig comprising of six cameras to obtain two independent stereo pairs of the subject face during a structured light projection with the remaining two cameras obtaining texture data under normal lighting conditions. Whilst the most common approaches to 3D reconstruction use least square comparison of image intensity values, our system achieves dense point matching using Gabor Wavelets as the primary correspondence measure.
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Scanalyze

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Scanalyze ScreenshotOriginally a system for merging range data from 3D Scanners. I modified this software and hijacked its ICP algorithms for use in a 3D face recognition system. An excellent bit of software with a highly customisable interface and a powerful scripting language.

Visit the Scanalyze homepage
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OpenCV

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An excellent and fully featured computer vision library. OpenCV (Open Source Computer Vision) is a library of programming functions mainly aimed at real time computer vision.

Example applications of the OpenCV library are Human-Computer Interaction (HCI); Object Identification, Segmentation and Recognition; Face Recognition; Gesture Recognition; Motion Tracking, Ego Motion, Motion Understanding; Structure From Motion (SFM); and Mobile Robotics.

OpenCV sourceforge site
OpenCV Wiki
OpenCV Yahoo group

Xface

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Xface is an open source toolkit implementing the MPEG-4 standard for facial animation.

Visit the Xface homepage

Main Features:

* Accepts MPEG-4 FAP files and SMIL-Agent scripts as input.
* Supports muscle based deformation (for MPEG-4) and keyframe based animation using morph targets.
* Muscle deformation methods/rules can be extended easily.
* Blending of visemes (visual phonemes), emotions, expressions.
* Head and eye movements (random and controlled).
* Can use various TTS engines using the pluggable factory mechanism.
* Control over TCP/IP. XfacePlayer can be controlled using any programming language thanks to our messaging system.
* Save animation as video in avi format.
* Platform independent code. (We distribute only windows version, however people reported compiling it under Linux successfully)
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Bionic eye offers hope of restored vision

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A new bionic eye could restore vision to the profoundly blind. A prototype was tested on six patients and ‘within a few weeks all could detect light, identify objects and even perceive motion again. For one patient, this was the first time he had seen anything in half a century.’ The user wears a pair of glasses that contain a miniature camera and that wirelessly transmits video to a cellphone-sized computer in the wearer’s pocket. This computer processes the image information and wirelessly transmits it to a tiny electronic receiver implanted in the wearer’s head.

Read the full article here
This story was covered on slashdot here.

Mimicking How the Brain Recognizes Street Scenes

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Scene Understanding with Biological FeaturesResearchers at the MIT McGovern Institute for Brain Research have used a biological model to train a computer model to recognize objects, such as cars or people, in busy street scenes. Their innovative approach, which combines neuroscience and artificial intelligence with computer science, mimics how the brain functions to recognize objects in the real world. This versatile model could one day be used for automobile driver’s assistance, visual search engines, biomedical imaging analysis, or robots with realistic vision.

Here is the original paper (pdf)

Martin Tosas: Visual Tracking of Articulated Objects

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Hand TrackingMartin’s research interests include: Image Processing, Visual Tracking, Human Computer Interfaces, and Robot Vision. His thesis involved hand tracking and Vision based interactive surfaces.

Visit Martin’s web site or have a look at this hand tracking video where a camera mounted to a HMD tracks Martin’s hand throughout a sample drawing application.

Be sure to check out the other videos in the Vision Based Interactive Surfaces section!
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3D Reconstruction

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3D Head ModelHere’s a quick video flythrough of a reconstruction of my face.

This scan was produced using hardware from 3DMD.

Download: Reconstruction flythrough

Stereo Vision for 3D Face Recognition

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The attached document is a summary of the work carried out in the first year of my Phd.

Download: Stereo Vision for 3D Face Recognition (pdf)

3D ComparisonFace recognition is one of the most important and rapidly advancing areas of computer science. Increased recent interest in improving commercial security systems has lead to intensive research into biometric identification and verification applications. Whilst a number of biometrics are potentially available for human recognition the face can usually be captured with the greatest degree of “passivity”, thus making it the most suitable choice for general security implementations.
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3D Reconstruction Using the Direct Linear Transform with a Gabor Wavelet Based Correspondence Measure

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Download: 3D Reconstruction Using the Direct Linear Transform (pdf)

This report aims to describe the technical details behind the development of a 3D reconstruction system for face recognition. Initially the methods used for constructing a 3D model of the face from several cameras are discussed followed by some consideration of the pitfalls and problems behind some of the techniques.
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