A Handheld projector or pocket projector , is a new technology that applies the use of an image projector in an handheld device. It is a response to the emergence/development of compact portable devices such as mobile phones, personal digital assistants, and digital cameras, which have sufficient storage capacity to handle presentation materials but little space to accommodate an attached display screen. Handheld projectors involve miniaturized hardware and software that can project digital images onto any nearby viewing surface.
Applications:
Handheld projector can be used for different applications than small conventional projectors. Since 2008 researchers are studying applications that are specifically designed for handheld projectors often using prototypes of mobile phones with an integrated projector.
Mobile:
Recent mobile phones have the ability to store thousands of photos and can be used to take photos with resolutions up to several megapixels. Viewing the photos is restricted by the phones' small displays. Projector phones allow photographs to be shared with a larger audience. One study found that people preferred to view and share photos with projector phones, compared to using conventional mobile phones.
Gaming:
Handheld projectors, in particular projector phones, could offer new possibilities for mobile gaming, as demonstrated by the adaptation of the PlayStation 3 game LittleBigPlanet. Digislide has developed the WeSii "Home Theatre in Your Hand" which sets the Wii free from the TV. WeSii won two iAwards in Australia in 2010. WeSii™ is a dockable/decoupable projector and audio system that enables the Nintendo Wii™ to travel anywhere you want to go. An infrared curtain has been designed into the WeSii™ audio system, so there’s no need for the fragile Wii™ sensor bar to travel. Furthermore, the WeSii™’s infrared curtain has an expanded capacity, allowing individual players to spread further out and use more physicality in their game.
Hand gesture recognition:
Size reduction of mobile devices is often limited by the size of the used display. Apart from the display a complete phone can be, for example, integrated in a headset. It has been demonstrated that pico projectors integrated in headsets could be used as interaction devices, e.g., using additional hand and finger tracking.
Pointer-based computer control:
Combining a pico projector with a webcam, a laser pointer, and image processing software enables full control of any computing system via the laser pointer. Pointer on/off actions, motion patterns (e.g., dwell, repetitive visit, circles, etc.) and more can all be mapped to events which generate standard mouse or keyboard events, or user-programmable actions.
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