Description of the data path
OSCAR Technical Manual
V2.4.0
88
Sub-sampling
What is sub-sampling?
Definition
Sub-sampling is the process of skipping neighboring pixels (with the same
color) while being read out from the CCD chip.
Which Oscar models have sub-sampling?
All Oscar models have this feature.
Description of sub-sampling
Sub-sampling is used primarily for the following reasons:
•
A reduction in the number of pixels and thus the amount of data while
retaining the original image area angle
•
Switch the sensor to progressive mode rather than frame readout mode.
•
Increase in the frame rate.
The sub-sampling mode of Oscar F-320C and Oscar F-810C is always H+V sub-
sampling mode. Oscar F-510C offers two additional special F_7 modes, with
horizontal full resolution, but vertically read out progressive (thus sub-sam-
pled). This is advantageous for applications relying on highest horizontal
resolution.
Use progressive modes to activate sub-sampling. The principal sub-sampling
pattern is shown below. Please note that various sensors skip more than two
rows in the sub-sampling mode. This is detailed in Chapter
Read out modes
of the sensor
on page 53.