Image Readout
The circuit in Figure 3 measures the voltage at each pixel. It is
read out sequentially, then converted to a digital
number by the analog-to-digital convertor (ADC) [1] at the bottom-right:
|
| Figure 3: Image readout circuit |
By reading the voltages at each pixel, we can form a complete digital image like
the one in Figure 4. Each number in the digital
image represents the brightness of one of the pixels.
0 represents black, 255 represents white, and numbers in between
represent various shades of gray.
 |
| Figure 4: Digital and visual representation of an image |
