Pixel Counting Definitions
Prior to the existence of the
Foveon X3 direct image sensor, there has been a 1:1 relationship
between the number of pixels (photodetectors) and the number of pixel
locations for a traditional CCD and CMOS image sensor. Given this
relationship, the generic term “pixel” has been commonly used to
reference both the pixel (photodetector) and the pixel location. Foveon
direct image sensors are a new type of image sensor that incorporates
three pixels(photodetectors) at every pixel location on the image
sensor. The definition of a pixel as indicated below is
consistent with standard industry conventions as applied to CCD image
sensors, CMOS image sensors, and the Foveon
X3 direct image sensor.
A pixel on the image
sensor of a digital camera is a light absorbing element (photodetector)
that converts light (photons) into electrons. A pixel is also referred
to as a pixel sensor when there is a need to distinguish the pixel from
A pixel location is the X,Y coordinate on the two-dimensional grid of an image sensor at which the pixel is located.
Foveon X3 direct image sensor consists of three layers of pixels. Each pixel detects 1 color sample.