For example, a 1,000 by 1,000 pixel sensor would have 1,000,000 pixels, or 1 megapixel.
Digital and movie cameras share an optical system, typically using a lens with a variable diaphragm to focus light onto an image pickup device.
There are several methods of application of the multi-shot technique.
The most common originally was to use a single image sensor with three filters passed in front of the sensor in sequence to obtain the additive color information.
Steven Sasson, an engineer at Eastman Kodak, invented and built the first self-contained electronic camera that used a charge-coupled device image sensor in 1975. The brighter the image at a given point on the sensor, the larger the value that is read for that pixel.
Depending on the physical structure of the sensor, a color filter array may be used, which requires demosaicing to recreate a full-color image.