88 Appendix B: Camera interface reference
Digital data formats
The following figure illustrates an analog composite video waveform:
camera
video signal1
vsync2
pixel clock3
frame grabber
ARY 5 frame0
IN 0 exposure: frame 1
0 transfer: frame 0
frame 1
exposure: frame 2
transfer: frame 1
IM 2 non-interlaced video signal
1. analog or digital
2. bi-directional and separate
vsync in some cases only
3. internal or external
frame 2
EL AY In digital video, pixel values are represented by an n-bit system, where a value
between 0 and 2n-1 represents the brightness value. For example, in an 8-bit
PR19 M system, pixels can have 256 possible values, ranging from 0 to 255. As n increases,
    "