First Light C-BLUE One, User Manual

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Note: The recommended recording area is 1604 x 1100 since pixels located at the edge of
the detector may behave differently.
Global shutter and IWR
In a global shutter configuration, the full array is exposed entirely at once. All the pixels begin and end
the exposure simultaneously. At the end of exposure, the image is transferred to the memory. Then,
the image is read-out while the next one is being exposed. Hence, all the pixels are exposed for the
same length of time at the same time. As illustrated in the schematic below, the sensor works in IWR
(Integrated while read), the readout is done during the exposure. As a result, almost no light is lost
between two integrations.
In full frame, the exact dead time are the following:
Note: The dead times can also be retrieved by subtracting the value of the
ExposureTimeMaxReg
register to 1/fps.
Schematic of the global shutter scheme
Global shutter is highly advantageous for dynamic imaging applications, as it allows:

No spatial distortion (see “rolling shutter effect”)

Accurate temporal correlation of different areas of the sensor

Simpler and faster synchronization of the camera with other components (light source, etc.)
Pixel depth Dead time imx425 Dead time imx426
8 bits 106.8 µs 46.0 µs
12bits 103.1 µs 58.5 µs