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NOIL1SN3000A
Figure 36. Dynamic Range Extended by Double Slope Capability
In slave mode, you have full control through the pins Exposure 1 and Exposure 2. Configure the multiple slope parameters
for the application and interpret the pixel data accordingly.
Figure 37. Dual Slope Timing in Slave Mode
Off-Chip FPN Correction
FPN is a kind of spatial noise, a noise that does not change
with time. FPN comes from two different sources. The first
source involves the variations between individual pixels.
Within a CMOS image sensor, the device is designed such
that each pixel is identical to all the others.
Although each pixel is similar to all of the others within
the array, there are slight variations. These variations arise
from variations in threshold voltages and offsets of the
amplifier within each pixel. Because these can vary for each
pixel within the pixel array; they are referred to as pixel FPN.
The second source of FPN involves the performance
variations of the amplifiers shared by each column of the
pixel array. The information within the pixel array is read out
on a column-by-column basis through these column
amplifiers. When one amplifier behaves slightly different
from another, the entire column can be affected. When this
happens, it results in what appears to be vertical lines in the
image. This is commonly called column FPN. Of the two
sources of FPN, column FPN is more noticeable than pixel
FPN.
LUPA3000 has no on-chip FPN correction so it must be
corrected off-chip in the software.
FPN can be calibrated off-chip by subtracting a dark
image from all captured images. For optimal results two
guidelines can be followed:
? Use an averaged dark image to calibrate FPN; this
eliminates other noise sources that are present in the
dark image.
? Use a different dark image to calibrate for different
operation conditions. Different operation conditions can
be changes in temperature, FOT and ROT timing, and
gain settings.
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