172 • Operational Reference Nano Series GigE Vision Camera
Cycling Mode Constraints with a changing ROI
The Nano Cycling Mode features support a changing ROI from one cycling preset to the next. The
ROI in this case refers to a single acquisition area which is a subset of the complete image frame.
The initial ROI size and position (i.e. features Width, Height, OffsetX, OffsetY) is setup via the
Image Format group of features. Obviously the defined initial ROI area would be smaller so as to
allow it to be moved around via the Cycling Mode OffsetX and OffsetY features set for each Cycling
Preset.
Specifics Concerning OnSemi Sensor Models
Nano Models using OnSemi Python Sensors implement an in-sensor ROI mode which can maximize
the possible acquisition frame rate. The following characteristics apply:
• Since OnSemi sensors support in-sensor ROI mode, only the ROI bounded sensor data is
read out, which can increase the maximum possible frame rate.
• The firmware for Nano OnSemi sensors will load the ROI X and Y offset settings for the next
cycling mode preset frame, during the readout period of the current frame. Again this will
maximize possible frame rates.
• When enabling in sensor ROI, the exposureAlignment is set to Reset.
• The Frame Rate might decrease due to the maximum frame rate becoming lower. The
original value is not restored when Cycling Mode in-Sensor ROI mode is disabled.
• Exposure time might increase due to the minimum exposure time becoming higher. The
original value is not restored when the in-sensor ROI mode is disabled.
Specifics Concerning Sony Sensor Models
Sony sensors can only use in-FPGA ROI settings, thus the complete sensor area must be readout to
the processing FPGA. Then the defined ROI area is read out of the FPGA and transmitted to the
host computer. This characteristic of Sony sensors does not provide any frame rate advantage
when using various ROI selections with Cycling Mode acquisitions.
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