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3 Operation
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3.4.2.7.1 Camera
This tab provides parameters for settings the pixel clock frequency, frame rate and exposure time for your DCx
camera (see also Pixel clock, frame rate and exposure time ).
Timing
Camera peak bandwidth
Maximum required bandwidth in MByte/s (peak load).
Camera average bandwidth
Required average bandwidth in MByte/s. The average bandwidth is calculated from the following data: Image
size, image format, frame rate, and interface-related protocol overhead.
Sensor (max. bandwidth)
Maximum data volume in MPixel/s created by the sensor.
With USB 2.0 cameras, the upper limit depends on the USB chipset on the mainboard/USB card and on the
number of USB devices connected. If transfer errors occur, reduce the pixel clock frequency.
Pixel Clock
Sets the clock rate at which the image data is read from the sensor. Changes to this parameter affect the frame
rate and the exposure time.
Many CMOS sensors allow higher pixel clock frequencies in binning/subsampling mode.
o Optimum
When you select this check box, the highest possible pixel clock is determined and set automatically. The
optimum pixel clock is the clock rate at which no transfer errors occur during the time (in seconds) set in the
"Auto pixel clock test period" box. The longer you set the test period, the more reliable the determined pixel
clock becomes. The total time it takes to automatically set the pixel clock is a bit longer than the test period
setting.
Note
If the "Exposure (AES)" (automatic exposure) option is enabled in the AES/AGC tab the pixel clock cannot
be set manually.
Frame rate (Freerun)
Sets the frame rate in freerun mode. The available frame rate range depends on the pixel clock setting.
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