Fig. 21.

Schematic representation of the 10 available ECAM readout modes: a) full-scale ($1\times 1$, upper left), b) half-scale ($2\times 2$, upper right), c) quarter-scale (lower left), and d) 1/8th scale (lower right). In modes 0 through 8, all image tiles returned from the cameras are nominally $1280\times 960$ pixels in size. In mode 9 the image tiles are $640\times 480$ pixels in size. In the above figure the $1\times 1$ and $2\times 2$ tiles are shown aligned on even multiples of $1280\times 960$ for simplicity. In actuality the location of tiles can be located anywhere on the sensor as long as the entire tile is inside the larger source image and the starting locations are even multiples of 8