Workshop by Prof Biju

Prof Biju first allow us to understand how a camera and projector works. He also talked about the different type of lens (15mm, 30mm, etc) and how the image sensor capture the image through the lens. While a projector have light that passes through an imaging lens and project the image.

For a normal projector, the further the screen from the projector, the larger the image projected.

Next, he went on to show us how to keep the image size regardless on how we move the screen. The camera and projector need to be at the same position to cancel off each other. The screen marker on the plane is detected by the camera which send the information to a software where a camera is in the same position in the real world.

We went on to further discuss regarding the reflector and how it manage to detect and play in different angle. It is important to take note of the xyz plane and the need to have multiple reflector instead of only 1 or 2.

One more thing that Prof Biju mentioned is that it is able to detect human movement by placing the reflector on the human itself. However, we can’t bring this installation out in the public due to all the camera and set up indoor. Thus, he mentioned that thats where Kinect come into the picture. Kinect sense the depth and decide where to project on.

All these can be useful when it comes to projection mapping as we need to understand whether the distance from the projector to the surface will affect the size of the thing we want to project.

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