Standard video projection
Simple single or multi-screen projection setups are typically used for corporate presentations, IMAG live video and simple visual backdrops.
This involves several projectors pointing at the same screen for added brightness or to form an ultra wide or tall screen shapes where a single image would be cropped so much that it would result in a substantial light loss and thus be adding cost.
Video mapping is a technique where the projection is very precisely adjusted using many control points as to perfectly match the projection surface. This is usually done for architectural feature mapping or to mask and texture odd shape screens and set-pieces on stage. Projector blending falls under this methodology where several projectors are used to create a large projected area and are seamlessly blended to create a uniform image.
3D mapping and 3D content
Possibly the most exciting and talked about the methodology of video projection is 3D Mapping. This is a very advanced mapping technique where the projection position, lens and other parameters are matched to the real world projection surface using a virtual 3D environment. It also involves a completely integrated 3D modelling and content production and together they create breathtaking effects.
Any of the above-mentioned projection methods can also benefit from interactive content that comes to life and responds to real-time inputs from cameras, sensors or show operators.