1.19 Appendix A. Specific Camera / Sensor Data 199
Mode Description
Continuous Free running, no external trigger signal needed.
OnDemand Image acquisition triggered by command (software trigger).
OnLowLevel As long as trigger signal is Low camera acquires images with own timing.
OnHighLevel As long as trigger signal is High camera acquires images with own timing.
See also
Using external trigger with CMOS sensors (p. 160)
1.19.2.1.2.4 Erase, exposure and readout
All pixels are light sensitive at the same period of time. The whole pixel core is reset simultaneously and after the
exposure time all pixel values are sampled together on the storage node inside each pixel. The pixel core is read
out line-by-line after exposure.
Note
Exposure and read out cycle is carry-out in serial; that causes that no exposure is possible during read
out.
The step width for the exposure time is 1 us.
Image data is then shifted out line-by-line and transferred to memory.
To calculate the maximum frames per second (FPS
max
) in snapshot mode you will need following formula:
FrameTime = (ImageWidth + 61)
*
((ImageHeight + 45) / PixelClock)
FPS_max = 1
-----------------------------------
FrameTime + ExposureTime
AOI PixelClock (MHz) Exposure Time (us) Maximal Frame Rate (fps) PixelFormat
Maximum 40 100 93.7 Mono8
W:608 x H:388 40 100 131.4 Mono8
W:492 x H:314 40 100 158.5 Mono8
W:398 x H:206 40 100 226.7 Mono8
1.19.2.1.3 Measured frame rates
1.19.2.1.4 Sensor Data
Device Structure
• Progressive scan CMOS image sensor
• Image size: 4.51(H)x2.88(V)mm (Type 1/3")
• Number of effective pixels: 752 (H) x 480 (V)
• Unit cell size: 6um (H) x 6um (V)
MATRIX VISION GmbH
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