page_title: Camera phone
section_title: Camera as an interaction device
hierarchical_section_title: Camera phone / Camera as an interaction device
caption_attribution_description: English: Andre Beverly rolls away after landing a trick at LES skatepark during the Best Trick Contest hosted by Red Bull Skate. Steve Rodriguez MC'd the event and holds the mic to the right of Beverly.
context_page_description: A camera phone is a mobile phone which is able to capture photographs and often record video using one or more built-in digital cameras. It can also send the resulting image over the telephone function. The first commercial camera phone was the Kyocera Visual Phone VP-210, released in Japan in May 1999. It was a cordless phone as distinct from a cellular mobile phone.
  Most camera phones are simpler than separate digital cameras. Their usual fixed-focus lenses and smaller sensors limit their performance in poor lighting. Lacking a physical shutter, some have a long shutter lag. Photoflash is typically provided by an LED source which illuminates less intensely over a much longer exposure time than a bright and near-instantaneous flash strobe. Optical zoom and tripod screws are rare and none has a hot shoe for attaching an external flash. Some also lack a USB connection or a removable memory card. Most have Bluetooth and WiFi, and can make geotagged photographs. Some of the more expensive camera phones have only a few of these technical disadvantages, but with bigger image sensors, their capabilities approach those of low-end point-and-shoot cameras.
context_section_description: The cameras of smartphones are used as input devices in numerous research projects and commercial applications. A commercially successful example is the use of QR Codes attached to physical objects. QR Codes can be sensed by the phone using its camera and provide an according link to related digital content, usually a URL. Another approach is using camera images to recognize objects. Content-based image analysis is used to recognize physical objects such as advertisement posters to provide information about the object. Hybrid approaches use a combination of un-obtrusive visual markers and image analysis. An example is to estimate the pose of the camera phone to create a real-time overlay for a 3D paper globe.
  Some smartphones can provide an augmented reality overlay for 2D objects and to recognize multiple objects on the phone using a stripped down object recognition algorithm as well as using GPS and compass. A few can translate text from a foreign language.
  Auto-geotagging can show where a picture is taken, promoting interactions and allowing a photo to be mapped with others for comparison.
  Smartphones can use their front camera (of lesser performance as compared to rear camera) facing the user for purposes like self-portraiture (selfie) and videoconferencing.
  Smartphones can usually not fixed on a tripod, which can make problems at filming or at taking pictures with long exposure times.
caption: A bystander uses his camera phone to record a skateboarder at LES skatepark, 2019
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