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 wirelessly and conveniently. The first commercial phone with color camera was the Kyocera Visual Phone VP-210, released in Japan in May 1999.[1]
Most camera phones are smaller and simpler than the separate digital cameras. In the smartphone era, the steady sales increase of camera phones caused point-and-shoot camera sales to peak about 2010 and decline thereafter.[2] The concurrent improvement of smartphone camera technology, and its other multifunctional benefits, have led to it gradually replacing compact point-and-shoot cameras.[3]
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The principal advantages of camera phones are cost and compactness; indeed for a user who carries a mobile phone anyway, the addition is negligible. Smartphones that are camera phones may run mobile applications to add capabilities such as geotagging and image stitching. Also, modern smartphones can use their touch screens to direct their camera to focus on a particular object in the field of view, giving even an inexperienced user a degree of focus control exceeded only by seasoned photographers using manual focus. However, the touch screen, being a general purpose control, lacks the agility of a separate camera's dedicated buttons and dial(s).
Starting in the mid-2010s, some advanced camera phones feature optical image stabilisation (OIS), larger sensors, bright lenses, 4K video and even optical zoom, for which a few use a physical zoom lens. Multiple lenses and multi-shot night modes are also familiar.[6] Since the late 2010s, high-end smartphones typically have multiple lenses with different functions, to make more use of a device's limited physical space. Common lens functions include an ultrawide sensor, a telephoto sensor, a macro sensor, and a depth sensor. Some phone cameras have a label that indicates the lens manufacturer, megapixel count, or features such as autofocus or zoom ability for emphasis, including the Samsung Omnia II (2009) and Galaxy S II (2011) and S20 (2020), Sony Xperia Z1 (2013) and some successors, Nokia Lumia 1020 (2013).
Mobile phone cameras typically feature CMOS active-pixel image sensors (CMOS sensors) due to largely reduced power consumption compared to charge-coupled device (CCD) type cameras, which few camera phones use[citation needed]. Some use CMOS back-illuminated sensors, which use even less energy,[7] at higher price than CMOS and CCD.
The usual fixed-focus lenses and smaller sensors limit performance in poor lighting. Lacking a physical shutter, some have a long shutter lag. Photoflash by the typical internal LED source illuminates less intensely over a much longer exposure time than a flash strobe, and none has a hot shoe for attaching an external flash. Optical zoom[8] and tripod screws are rare and 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 (a few are up to 1", such as the Panasonic Lumix DMC-CM1), their capabilities approach those of low-end point-and-shoot cameras. The few hybrid camera phones such as Samsung Galaxy S4 Zoom and K Zoom were equipped with real optical zoom lenses.
As camera phone technology has progressed, lens design has evolved from a simple double Gauss or Cooke triplet to many molded plastic aspheric lens elements made with varying dispersion and refractive indexes. Some phone cameras also apply distortion (optics), vignetting, and various optical aberration corrections to the image before it is compressed into a JPEG format.
Optical image stabilization allows longer exposures without blurring, despite trembling. The earliest known smartphone to feature it on the rear camera is in late 2012 on the Nokia Lumia 920, and the first known front camera to feature one is on the HTC 10 from early 2016.[9][10]
Few smartphones such as LG initially with the 2014 G3 are equipped with a time-of-flight camera with infrared laser beam assisted auto focus. A thermal imaging camera has initially been implemented in 2016 on the Caterpillar S60.
High dynamic range imaging merges multiple images with different exposure values for a balanced brightness across the image and was first implemented in early 2010s smartphones such as the Samsung Galaxy S III and iPhone 5. The earliest known smartphone to feature high dynamic range filming is the Sony Xperia Z, 2013, where frames are arrayed by changing the exposure every two lines of pixels to create a spatially varying exposure (SVE).[11][12]
Most camera phones have a digital zoom feature, which may allow zooming without quality loss if a lower resolution than the highest image sensor resolution is selected, as it makes use of image sensors' spare resolution. For example, at twice digital zoom, only a quarter of the image sensor resolution is available. A few have optical zoom, and several have a few cameras with different field of view, combined with digital zoom as a hybrid zoom feature. For example, the Huawei P30 Pro uses a periscope 5x telephoto camera with up to 10x digital zoom, resulting in 50x hybrid zoom.[14] An external camera can be added, coupled wirelessly to the phone by Wi-Fi. They are compatible with most smartphones. Windows Phones can be configured to operate as a camera even if the phone is asleep.
When viewed vertically from behind, the rear camera module on some mobile phones is located in the top center, while other mobile phones have cameras located in the upper left corner. The latter has benefits in terms of ergonomy due to the lower likelihood of covering and soiling the lens when held horizontally, as well as more efficient packing of tight physical device space due to neighbouring components not having to be built around the lens.
Mobile phones with multiple microphones usually allow video recording with stereo audio. Samsung, Sony, and HTC initially implemented it in 2012 on their Samsung Galaxy S3, Sony Xperia S, and HTC One X.[15][16][17] Apple implemented stereo audio starting with the 2018 iPhone Xs family and iPhone XR.[18]
Camera phones can share pictures almost instantly and automatically via a sharing infrastructure integrated with the carrier network. Early developers including Philippe Kahn envisioned a technology that would enable service providers to "collect a fee every time anyone snaps a photo".[19] The resulting technologies, Multimedia Messaging Service (MMS) and Sha-Mail, were developed parallel to and in competition to open Internet-based mobile communication provided by GPRS and later 3G networks.
The first commercial camera phone complete with infrastructure was the J-SH04, made by Sharp Corporation; it had an integrated CCD sensor, with the Sha-Mail (Picture-Mail in Japanese) infrastructure developed in collaboration with Kahn's LightSurf venture, and marketed from 2001 by J-Phone in Japan today owned by Softbank. It was also the world's first cellular mobile camera phone. The first commercial deployment in North America of camera phones was in 2004. The Sprint wireless carriers deployed over one million camera phones manufactured by Sanyo and launched by the PictureMail infrastructure (Sha-Mail in English) developed and managed by LightSurf.
While early phones had Internet connectivity, working web browsers and email-programs, the phone menu offered no way of including a photo in an email or uploading it to a web site. Connecting cables or removable media that would enable the local transfer of pictures were also usually missing. Modern smartphones have almost unlimited connectivity and transfer options with photograph attachment features.
During 2003 (as camera phones were gaining popularity), in Europe some phones without cameras had support for MMS and external cameras that could be connected with a small cable or directly to the data port at the base of the phone. The external cameras were comparable in quality to those fitted on regular camera phones at the time, typically offering VGA resolution.
One of these examples was the Nokia Fun Camera (model number PT-3) announced together with the Nokia 3100 in June 2003.[20] The idea was for it to be used on devices without a built-in camera (connected via the Pop-Port interface) and be able to transfer images taken on the camera (VGA resolution and a flash) directly to the phone to be stored or sent via MMS.[21]
In 2013-2014 Sony and other manufacturers announced add-on camera modules for smartphones called lens-style cameras. They have larger sensors and lenses than those in a camera phone but lack a viewfinder, display and most controls. They can be mounted to an Android or iOS phone or tablet and use its display and controls. Lens-style cameras include:
Users may use bundled camera software, or install alternative software. Bundled software may be optimized by the vendor for performance, whereas alternative software may offer functionality and controls and customization missing in bundled software.[32]
The graphical user interface typically features a virtual on-screen shutter button located towards the usual home button and charging port side, and a thumbnail previewing the last photo, and some status icons that may display settings such as selected resolution, scene mode, stabilization, flash, and a battery indicator. The camera software may indicate the estimated number of remaining photographs until exhausted space, the current video file size, and remaining space storage while recording, as done on early-2010s Samsung smartphones. Shortcuts to settings in the camera viewfinder may be customizable.[33][34][35]
In September 2013, Apple introduced a camera viewfinder layout with iOS 7 that would be implemented by several other major vendors towards the late 2010s. This layout has a circular and usually solid-colour shutter button and a camera mode selector using perpendicular text and separate camera modes for photo and video. Vendors that have ditched their layout to implement variations of Apple's layout include Samsung, Huawei, LG, OnePlus, Xiaomi, and UleFone.[36] 2351a5e196
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