Samuel Audet

Learn More
Projector-camera systems drive applications in many fields such as measurement and spatial augmented reality. When needed, we can find their internal and external parameters via geometric calibration. For this process, we have to use both a printed pattern and a projector pattern , but they can easily interfere with each other. Current methods compensate by(More)
Projector-camera systems use computer vision to analyze their surroundings and display feedback directly onto real world objects, as embodied by spatial augmented reality. To be effective, the display must remain aligned even when the target object moves, but the added illumination causes problems for traditional algorithms. Current solutions consider the(More)
When an occluding object, such as a person, stands between a projector and a display surface, a shadow results. We can compensate by positioning multiple projectors so they produce identical and overlapping images and by using a system to locate shadows. Existing systems work by detecting either the shadows or the occluders. Shadow detection methods cannot(More)
The plane sweep algorithm, although widely used in computational geometry, does not parallelize efficiently, rendering it incapable of benefiting from recent trends of multi-core CPUs and general-purpose GPUs. Instead of the plane sweep, some researchers have proposed the uniform grid as a foundation for parallel algorithms of computational geometry, but(More)
  • Samuel Audet, Matios Bedrosian, Cyril Clement, Monica Dinculescu
  • 2006
Most PC games are limited to a keyboard and a mouse, where the physical capabilities of the human hand are not fully taken advantage of. Based on Tetris, a traditionally single player keyboard-game, mulTetris brings a new easy-to-use interface involving a brick-like device as part of a collaborative game. In mulTetris, the controlling brick is tracked by a(More)
Augmented reality applications based on video projection, to be effective, must track moving targets and make sure that the display remains aligned even when they move, but the projection can severely alter their appearances to the point where traditional computer vision algorithms fail. Current solutions consider the displayed content as interference and(More)
When a person stands between a projector and a display surface a shadow occurs. We show a method to perform shadow removal using camera-based object tracking and a three-dimensional model of a room, which includes cameras, projectors, and flat surfaces. For tracking people, although we use cameras, other methods would work. To obtain the model, we adapted(More)
— This report consists of a literature review of papers dealing with object recognition using unsupervised learning techniques. Five papers that brought important contributions to the field are summarized, analyzed and compared. It was found that unsupervised object recognition was considered first as an image segmentation problem, but new unsupervised(More)
For this project, the shadow removal method used by Finlayson et al. in [1] was implemented. This report contains an overview of the mathematical background and a detailed discussion on the experiments performed with the implementation. This method consists of two independent steps. First, an illumination invariant image is derived from a color image for(More)
  • 1