PixArt Imaging Inc.
PAS005B
CMOS Image Sensor IC
further alteration to the signal can be applied before the data is output:
2.2 Automatic Background Compensation (ABC)
The ABC function is implemented by 3 steps : ABC-A, Frame-based ABC-D, and Line-based ABC-D. The
ABC-A is implemented in analog domain with an on-chip 9b DAC. The Frame-based ABC-D is implemented
in digital domain to automatically compensate the leakage current with 2 dark reference lines on top of sensor
array. The Line-based ABC-D is implemented in digital domain to automatically compensate the leakage with
4 dark reference columns surround the sensor array. These three blocks can be enable/disable separately by
user.
2.3 Defect Compensation
The Defect Compensation block can detect the possible defect pixel and replace it with average output of like-
colored pixels on either side of defective pixel. There is no limitation in the capability of defect number. This
function is also enable/disable by user.
2.4 Companding
The companding function is used to simulate the gamma curve and do non-linear transformation before the
data is output. There are 8 curves selected by setting register comp_crv[2:0] as shown in Fig. 2.4. The default
value [00] is a linear curve.
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