The Magic Behind Digital Camera
Mar 21, 2010 Lenses
A digital camera as a film or videotape cameras uses an electronic sensor, contrary to convert images (or video) into electronic data. Modern digital cameras are typically multifunctional and the same device can take pictures, make videos and / or clay. In 2005, digital cameras are starting to push traditional film cameras in many markets. Decrease size of devices are included recently, miniature digital cameras into multi-functional devices such as cellphones and PDAs. Classification digital cameras can be divided into several groups: video cameras * Professional video cameras, as in television and film production uses. They usually have more than one image sensors (one per color plus) resolution and color space. Professional video cameras usually do not have a built-in VCR or microphone. > * Camcorders used by amateurs. It is a combination of Camera and video recorder to create an all-in-one production unit. They usually contain a microphone to record sound, and feature a small LCD for watching video during shooting and playback. Still Cameras digital Cameras are generally by the use of flash memory and USB or FireWire for storage and transfer Out. Most have a rear LCD screen to review the records. They are designed in megapixels, which means that the product of their maximum resolution dimensions. The actual transfer to a host computer is usually done using the USB Mass Storage Class (so that the device appears as a drive) or the Picture Transfer Protocol and its derivatives. Any use of a CCD (Charged Coupled Device for), which was a chip with a grid of phototransistors to the intensity of light above the business plan is the Camera direction. Recently there was an application of a second type of chip called CMOS (Complementary Metal-Oxide Semiconductor) sensor, and this chip is often distinguished by a CCD in the law consumes less energy and Another type of detection equipment to light, but the differences are highly technical and many manufacturers are still on the CMOS chip a Charged Coupled device. For our purposes, a chip, a CCD sensor. * Standard Digital Cameras: This encompasses most digital cameras. They are very easy to use and easy development, this concept allows for a capacity limited Motion Picture marked. They have a great depth of field. This allows objects at different depths in the development can also conducts much of the light reflects focus. It is also one of the reasons professional photographers find their images flat or artificial look. They are distinguished in landscape photography and casual use.
/ p> * DSLRs generally have a term of nine sensors times that of a standard digital Camera oriented and professional photographers and enthusiasts. They resemble ordinary professional cameras in most ways to make flash components and replaceable lens, the user maximum control over light, sharpness and depth of field. You are also larger and more expensive than the casual user oriented colleagues. They are excellent for portraits and artistic photography because they can be customized for different applications with a full range of interchangeable Lenses. Modular Systems professional digital camera High-end digital camera will be supported by professional devices usually separated from the body of devices that are used. (This is because the system size and the largest average camera for professional use at the time of digital acquisition were exceeded as a support film professionals in choosing a modular nature, ie, the device had several objectives, the viewfinder winders and backs available have been put in place to comply with various requirements.) From the back first, there were three main methods of “registering” the image in each of the hardware configuration of the respective back rest. The first method is often called “single shot” in terms of number of the camera sensor is exposed to light through the lens. Using
systems single-shot capture, a CCD with a Bayer filter on them or three CCDs (one each for the primary additive colors red, green and blue), the same Image suspended by a beam splitter are marked. The second method is known as “Multi-Shot” because the sensor to suspend the image in a sequence of three or more openings in the diaphragm. There are several methods for implementing multi-shooting technique. The most common cause on a single CCD with three filters used (once again red, green and blue) in front of the sensor, series adopted by the additive color information model. Another method uses a multiple stroke single CCD, a sensor with a Bayer filter but actually moved the physical location of the sensor chip in the focal plane of the lens of “Stitch” together a resolution than the CCD would otherwise allow. A third option combines the two methods of slaughtering without a Bayer filter on the chip. The third method is called “scan” because the sensor moves in the focal plane, similar to the sensor of a desktop scanner. These CCDs are usually referred to as “glue” instead of “chips because they use a single row of pixels (more properly” photo sites “), which in turn are” stamped “with the filter Bayer. The choice of method for a particular record is of course largely determined by the subject. Normally, it is inappropriate to ask a subject which moves (like people or objects in motion) with anything but a single shot capture. However, the superior color and larger file sizes and resolutions available with multi-shot and scan-backs make them attractive for commercial photographers working with stationary subjects and large-format photographs. Webcams * Webcams Attached digital cameras, computers, used for video conferencing or other purposes. Webcams may be the full video motion capture as well, and some models are equipped with microphones or zoom ability. These devices range in price from cheap to very expensive high-end models, many webcams have a complex servo-controlled base capable of tracking facial movements using the software. interpolation
< ; / p> color or image resolution interpolation is used if the device uses a beam splitter approach to a sudden, the three-filter multi-shot approach, or Foveon X3 image sensor. The Program Special to the camera interprets the data received from the sensor to a color image. This is because, in digital images, each pixel has three values of light intensity, one for red, green and blue channel. A normal sensor element can not simultaneously record these three values. The Bayer filter pattern is typically used. A model of the Bayer filter is a 2×2 model of light filters, green, at opposite corners and red and blue also. The proportion of green exploits the properties of human visual system, which is intended primarily for the green light and is much more sensitive than the brightness or color saturation . Sometimes a rule 4-color filter is used, often combined with 2 different colors of green. This allows a color gamut wider, but requires a more complicated interpolation. Color of light can be interpolated for each pixel (registered guessed or calculated) by the values of neighboring pixels, which will provide the color. In some cases, the highest resolution in the image by moving sites Photo of a standard grid sites photos that are adjacent to each other at 45 degrees, and all three values are for “virtual” sites photos that are interpolated in the fall of interpolated spaces at an angle of 90 degrees from the actual photo sites. Connectivity Many digital cameras can be connected directly to a computer to transfer data. USB is the most used, although some have a port Firewire. Simple integration p Some devices, like mobile phones integrated digital cameras. cell phone cameras are sold much more independent digital works. Storage
/ p> Digital cameras need memory to store data. And the more we advance in the size of pixels, the more memory is needed. camera, removable memory card to store data, but the cheapest cameras and smaller may use futures instead of internal memory. Some cameras come with built-in memory as well. self A device independently, as a PictBridge printer works without the need a computer. The device connects to the printer, which then downloads and prints its images. Some DVD recorders and television sets can read memory cards too.
