Cameras

A camera is a device for taking photos and videos (image data) for viewing and printing (displaying). The camera is one of the most influential devices in the world as it allows us to view things that most of us would never see in our lives if not for the camera. We can also use the camera to record memories to show future gernerations. There are many types of camera's on the market.

Cameras can also be used for security reasons, so that we can watch for intruders. Cameras are also used on the roads to measure speed, to make sure people aren't going over the speed limit.

Workings
When light passes through the lens of a digital camera, it hits an image sensor, made up of several million microscopic bucket-shaped pixel sensors that count the amount of photons of light that hit the sensor. The more photons that hit a certain pixel sensor, the higher the resulting binary numeral for the corresponding pixel, and the brighter the pixel is on the resulting image.

For colour cameras, a colour filter array is placed over the image sensor. These filter the light regarding the light's wavelength. The difference in the wavelength determines the colour of the light. One of the more common arrays used is the Bayer filter.