As is shown in previous chapters, active lighting is a powerful tool that satisfies various demands. Succeeding chapters provide several application examples of active lighting. Projecting active-lighting images onto real objects augments their appearance. Such projection mapping is now widely used in various fields, including the entertainment industry. Actively lighting multispectral lights onto oil paintings enables novel art modifications. Multispectral light can deceive human eyes because of our RGB limitations, because the light is represented using continuous wavelengths. Therefore, multispectral light can augment the visualization of real objects. Active lighting also enables us to capture the depth of the human body. Thus, a human pose can be estimated from the analysis of its depth. To represent a digital character, capturing actual human motion enables realistic duplication. Estimating human body positions is necessary for representing the motion of digital character and user positions in augmented-, virtual-, and mixed-reality systems.