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1.19.2.4 mvBlueFOX-[Model]202b (1.2 Mpix [1280 x 960])
1.19.2.4.1 Introduction
The CMOS sensor module (MT9M021) incorporates the following features:
• resolution to 1280 x 960 gray scale or RGB Bayer mosaic
• supports window AOI mode with faster readout
• programmable analog gain (0..12 dB)
• progressive scan sensor (no interlaced problems!)
• pipelined global shutter
• programmable readout timing with free capture windows and partial scan
• many trigger modes (free-running, hardware-triggered)
1.19.2.4.2 Details of operation
The sensor uses a pipelined global snapshot shutter (ShutterMode = "FrameShutter") , i.e. light exposure
takes place on all pixels in parallel, although subsequent readout is sequential.
Therefore the sensor offers two different modes of operation:
• free running mode (Overlapping exposure and readout)
• snapshot mode (Sequential exposure and readout)
1.19.2.4.2.1 Free running mode
In free running mode, the sensor reaches its maximum frame rate. This is done by overlapping erase, exposure and
readout phase. The sensor timing in free running mode is fixed, so there is no control when to start an acquisition.
This mode is used with trigger mode Continuous.
To calculate the maximum frames per second (FPS
max
) in free running mode you will need following formula:
FrameTime = (ImageHeight
*
(1650 / PixelClock)) + (25
*
(1650 / PixelClock))
If exposure time is lower than frame time:
FPS_max = 1
----------------------
FrameTime
If exposure time is greater than frame time:
FPS_max = 1
------------------------
ExposureTime
MATRIX VISION GmbH
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