Specim FX17, Справочное руководство

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| Functionality | 23
Exposure time Period during which the pixels are integrating the
incoming light.
PCLK Pixel clock on CameraLink
®
interface.
SHUTTER Internal signal, shown only for clarity. Is ’high’ during
the exposure time.
FVAL (Frame Valid) Is ’high’ while the data of one complete frame are
transferred.
LVAL (Line Valid) Is ’high’ while the data of one line are transferred.
Example: To transfer an image with 640x480 pixels,
there are 480 LVAL within one FVAL active high period.
One LVAL lasts 640 pixel clock cycles.
DVAL (Data Valid) Is ’high’ while data are valid.
DATA Transferred pixel values. Example: For a 100x100 pixel
image, there are 100 values transferred within one LVAL
active high period, or 100*100 values within one FVAL
period.
Line pause Delay before the first line and after every following line
when reading out the image data.
Reduction of Image Size
Region of Interest (ROI)
The image sensor in FX series cameras is larger than the actual image size. Therefore the image area on the sensor
is defined using the Region of Interest (ROI) feature, and the ROI values are provided in the calibration pack. ROI
feature is reserved for this purpose alone, and the values must not be changed.
Figure 22: FX camera image size (ROI) on sensor
When you want to define a region of interest, it is done using the Multiple Regions of Interest (MROI) feature. See
Multiple Regions of Interest
for more information.
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