AR0833 Datasheet, PDF (30/64 Pages) ON Semiconductor – 8 Mp CMOS Digital Image Sensor

AR0833: 1/3.2-Inch 8 Mp CMOS Digital Image Sensor
Integration Time for Interlaced HDR Readout
Bayer Resampler
The imaging artifacts found from a 2x2 binning or summing will show image artifacts
from aliasing. These can be corrected by resampling the sampled pixels in order to filter
these artifacts. Figure 17 shows the pixel location resulting from 2x2 summing or
binning located in the middle and the resulting pixel locations after the Bayer re-
sampling function has been applied.
Figure 17: Bayer Resampling
The improvements from using the Bayer resampling feature can be seen in Figure 18. In
this example, image edges seen on a diagonal have smoother edges when the Bayer re-
sampling feature is applied. This feature is only designed to be used with modes config-
ured with 2x2 binning or summing. The feature will not remove aliasing artifacts that are
caused skipping pixels.
Figure 18: Results of Resampling
2x2 binned - before
2x2 binned - after resampling
To enable the Bayer resampling feature:
1. Set R0x400 = 2 // Enable the on-chip scalar.
2. Set R0x306E to 0x90B0 // Configure the on-chip scalar to resample Bayer data.
To disable the Bayer resampling feature:
1. Set R0x400 = 0 // Disable the on-chip scalar.
2. Set R0x306E to 0x9080 // Configure the on-chip scalar to resample Bayer data.
Note:
The image readout (rows and columns) has to have two extra rows and two extra col-
umns when using the resample feature.
Figure 19: Illustration of Resampling Operation
Image array readout
3264 x 2448
2 x 2 binning
Image size output
1632 x 1224
Resampling
Resampled image output
1632 x 1224
AR0833_DS Rev. H Pub. 4/15 EN
30
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