A camera is an optical instrument for recording and capturing images, which can be stored locally, transmitted to another location or both.In the fifth century B.C, the Chinese philosopher Mo Ti noted that a pinhole can form an inverted and focusing image, when light passes through the hole and into a dark area. Mo Ti is the first person recorded to have used this phenomenon to trace the inverted image to create a picture. The Digital cameras store photographs as long strings of numbers, not as patterns of darkness and light used in ordinary film camera. The word camera comes from `camera obscura’, which means “dark chamber”.
Digital cameras works in a completely different way than the ordinary film cameras. When we press the button to take a photograph with a digital camera, an aperture opens at the front of camera and light enters through the lens. There is no film in a digital camera, instead there is a piece of electronic image sensor, usually a charge coupled device (CCD) or a CMOS sensor that captures the incoming light rays and turn them into electrical signals.
The light from the object you are photographing zooms into the camera lens. A shutter mechanism controls the length of time that the light enters the camera. This incoming ‘picture’ hits the image sensor chip, which breaks it up into millions of pixels. The sensor measures the color and brightness of each pixel and stores it as number. Thus the digital photography is an enormously long string of numbers describing the exact details of each pixel it contains.
Following parts are usually found in digital camera:-
1.Battery compartment: The power required for working of camera is acquired from the batteries inside the battery compartment.
2:Flash capacitor: The capacitor charges up for several seconds to store enough energy to fire the flash.
3.Flash lamp: Operated by the capacitor. Xenon flash lamps are usually used.
4.LED: A small red LED indicates when the self-timer is operating.
5.Lens: It captures light from the object and focuses it on CCD or CMOS. Convex lenses are used. The telephoto lens is used for sports and wildlife but it is more susceptible to camera shake.
6.Focusing mechanism: This mechanism is helpful in taking either close ups or distant shots. Some cameras have post focusing. Post focusing means that the pictures taken are then focused later in PC.
7.Image sensor: This is a light detecting micro chip (CCD or CMOS). It is placed directly underneath the lens.
8.USB Connector: USB cable is attached here for copying the photos taken, to computer.
9.SD card slot: A flash memory card can be slide inside it for storing more photos.
Processor chip: The camera’s main digital brain. This controls all the camera functions.
The edit we are doing on the digital photograph using image editing program, we actually is adjusting the numbers that represent each pixel of the image. High quality photograph contains a string millions of numbers, that’s why high quality images often make more enormous file. So technique called Compression is used, which squeezes digital photos so that it can be stored in less memory.
New advanced improvements are happening in the camera industry. Modern cameras with more interesting specs are available in markets nowadays!!.
Digital cameras works in a completely different way than the ordinary film cameras. When we press the button to take a photograph with a digital camera, an aperture opens at the front of camera and light enters through the lens. There is no film in a digital camera, instead there is a piece of electronic image sensor, usually a charge coupled device (CCD) or a CMOS sensor that captures the incoming light rays and turn them into electrical signals.
CCD
The light from the object you are photographing zooms into the camera lens. A shutter mechanism controls the length of time that the light enters the camera. This incoming ‘picture’ hits the image sensor chip, which breaks it up into millions of pixels. The sensor measures the color and brightness of each pixel and stores it as number. Thus the digital photography is an enormously long string of numbers describing the exact details of each pixel it contains.
Source:en.wikipedia.org
Following parts are usually found in digital camera:-
Source:www.explainthatstuff.com
2:Flash capacitor: The capacitor charges up for several seconds to store enough energy to fire the flash.
3.Flash lamp: Operated by the capacitor. Xenon flash lamps are usually used.
4.LED: A small red LED indicates when the self-timer is operating.
5.Lens: It captures light from the object and focuses it on CCD or CMOS. Convex lenses are used. The telephoto lens is used for sports and wildlife but it is more susceptible to camera shake.
6.Focusing mechanism: This mechanism is helpful in taking either close ups or distant shots. Some cameras have post focusing. Post focusing means that the pictures taken are then focused later in PC.
7.Image sensor: This is a light detecting micro chip (CCD or CMOS). It is placed directly underneath the lens.
8.USB Connector: USB cable is attached here for copying the photos taken, to computer.
9.SD card slot: A flash memory card can be slide inside it for storing more photos.
Processor chip: The camera’s main digital brain. This controls all the camera functions.
The edit we are doing on the digital photograph using image editing program, we actually is adjusting the numbers that represent each pixel of the image. High quality photograph contains a string millions of numbers, that’s why high quality images often make more enormous file. So technique called Compression is used, which squeezes digital photos so that it can be stored in less memory.
New advanced improvements are happening in the camera industry. Modern cameras with more interesting specs are available in markets nowadays!!.
No comments:
Post a Comment