CYII4SC1300AA-QSC datasheet(20/37 Pages) CYPRESS

20 / 37 page

IBIS4-1300

Document Number: 38-05707 Rev. *B

Page 20 of 37

curve is tolerant for external pixel offset error correction. This

means that pixel offset variations can be corrected by

changing the offset after the non-linear AD conversion. This is

so because the non-linear transfer function is

H(s) = 1-exp(-a*s)

by design, and neglecting the offset, the relation between the

non-linear output (y) and the linear output (x) is exactly:

Y = 1024 * (1 - exp(-x/713)) / (1 - exp(-1024/713))

This law yields an increased accuracy of about a factor 2 near

the zero end of the scale. It is thus possible to obtain an

effective 11 bit accuracy on a linear scale after post processing

by applying the reverse law to the non-linear output:

Z = -2 * 713 * ln(1 - y/(1024/(1-exp(-1024/713)))) = -1426 * ln(1-y/1343.5)

Then Z is an 11-bit linear output in the range 0...2047.

Operation of the image sensor

Set configuration & pulse timing

Figure 15. typical operation mode (readout of a frame)

Set configuration

output offset

amplifier gain

viewfinder on/off

determine integration

time of next frame

Set flag to restart YR shift

Execute row initialization

sequence

Acquire pixel (X,Y)

For Y = 0 till Ymax do

1026 -

integration

time ?

For X = 0 to Xmax do

Setflagtorestart YL shift

Yes

StartX shiftregister

SYNC_X

Next Y

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