Digital Cameras of Today's World
Digital cameras are cameras that take videos or still photographs by recording images on an electronic image sensor. Most digital cameras are incorporated into many devices ranging from PDAs and mobile phones (called camera phones) to vehicles.
Steven Sasson as an engineer at Eastman Kodak invented and built the first electronic camera using a charge-coupled device image sensor in 1975.Earlier ones used a camera tube; later ones digitized the signal. Early uses were mainly military and scientific; later medical and news applications became prominent, and in the 1990s digital cameras became a mainstream consumer product.
Steven Sasson as an engineer at Eastman Kodak invented and built the first electronic camera using a charge-coupled device image sensor in 1975.Earlier ones used a camera tube; later ones digitized the signal. Early uses were mainly military and scientific; later medical and news applications became prominent, and in the 1990s digital cameras became a mainstream consumer product.
Since the first digital backs were introduced, there have been three main methods of capturing the image, each based on the hardware configuration of the sensor and color filters.
<----- At the heart of a digital camera is a CCD or a CMOS image sensor.
The first method is often called single-shot, in reference to the number of times the camera's sensor is exposed to the light passing through the camera lens.The second method is referred to as multi-shot because the sensor is exposed to the image in a sequence of three or more openings of the lens aperture
<----- At the heart of a digital camera is a CCD or a CMOS image sensor.
The first method is often called single-shot, in reference to the number of times the camera's sensor is exposed to the light passing through the camera lens.The second method is referred to as multi-shot because the sensor is exposed to the image in a sequence of three or more openings of the lens aperture
Connectivity
Transferring photos [edit] Many digital cameras can connect directly to a computer to transfer data: Early cameras used the PC serial port. USB is now the most widely used method (most cameras are viewable as USB mass storage), though some have a FireWire port. Some cameras use USB PTP mode for connection instead of USB MSC; some offer both modes. Other cameras use wireless connections, via Bluetooth or IEEE 802.11 Wi-Fi, such as the Kodak EasyShare One.
Cameraphones and some high-end stand-alone digital cameras also use cellular networks to connect for sharing images. The most common standard on cellular networks is the MMS Multimedia Messaging Service, commonly called "picture messaging". The second method with smartphones is to send a picture as an email attachment. Many cameraphones do not support email, so this is less common. A common alternative is the use of a card reader which may be capable of reading several types of storage media, as well as high speed transfer of data to the computer.
Use of a card reader also avoids draining the camera battery during the download process. An external card reader allows convenient direct access to the images on a collection of storage media. But if only one storage card is in use, moving it back and forth between the camera and the reader can be inconvenient. Many computers have a card reader built in, at least for SD cards.
Cameraphones and some high-end stand-alone digital cameras also use cellular networks to connect for sharing images. The most common standard on cellular networks is the MMS Multimedia Messaging Service, commonly called "picture messaging". The second method with smartphones is to send a picture as an email attachment. Many cameraphones do not support email, so this is less common. A common alternative is the use of a card reader which may be capable of reading several types of storage media, as well as high speed transfer of data to the computer.
Use of a card reader also avoids draining the camera battery during the download process. An external card reader allows convenient direct access to the images on a collection of storage media. But if only one storage card is in use, moving it back and forth between the camera and the reader can be inconvenient. Many computers have a card reader built in, at least for SD cards.