Dalsa Genie Nano-5G Series, User Manual

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Nano-5G Series GigE Vision Camera Operational Reference • 55
Bayer Mosaic Pattern
Genie Nano-5G Color cameras output raw Bayer image data using the mosaic pattern shown below.
Teledyne DALSA Sapera CamExpert tool interprets the raw Bayer output when the user enables the
Pre-Processing Software Bayer Decoder. CamExpert also provides an automatic white balance tool
to aid RGB gain adjustments.
Bayer Mosaic Pattern and the CamExpert processing function to decode the Genie Nano-5G Color
Exposure Alignment: Overview
Exposure Control modes define the method and timing of controlling the sensor integration period.
The integration period is the amount of time the sensor is exposed to incoming light before the
video frame data is transmitted to the controlling computer.
• Exposure control is defined as the start of exposure and exposure duration.
• The feature Exposure Mode selects the controlling method for the exposure.
• The start of exposure is initiated by an internal timer signal, an external input trigger signal
(Trigger Mode=ON), or a software function call.
• The exposure duration can be programmable (Exposure Mode = Timed, free run or external
trigger ) or controlled by the external input trigger pulse width (Exposure Mode = TriggerWidth).
Note that different Nano-5G models will support different combinations of exposure controls.
See also
Trigger Overlap: Feature Details .
Synchronous Exposure Alignment
Exposure is synchronous to the internal timing of the sensor. The readout is concurrent to the
exposure for the fastest possible frame rate.
When a valid trigger is received and the Exposure Time is shorter than the readout period, the
Exposure
Start event is latched in the previous frame’s readout. That is; the Exposure Start Event
is delayed and is initiated when the actual exposure starts such that the exposure ends and
readout begins as soon as the previous readout has completed.
• For Sony sensor models the exposure is synchronous to the line timing of the sensor. The frame
exposure start is subject to 1 horizontal line jitter.
• Sony sensors also add an extra two line-time at the end of exposure. For short very exposures
the starting jitter and ending extension will be significant.
• The programmable exposure duration is in 1µs steps.
• Exposure duration is from a camera sensor specific minimum (in µs) up to 16 sec.
• Any trigger received before the start of frame readout is ignored and generates an invalid frame
trigger event.