Dalsa Piranha XL PX-HM-16K12B-00-R, Руководство пользователя

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The Piranha XL Camera
Achieving Faster Scan Speeds When Lower Image
Resolution Is Acceptable (Binning)
See the section Image Format Control Category in Appendix A for GenICam features associated
with this section and how to use them
Relevant Features: Horizontal Binning, Vertical Binning
In certain applications, lower image resolution may be acceptable if the desired defect detection
can still be achieved. This accommodation can result in higher scan speeds, as the distance
travelled per encoder pulse is increased due to the larger object pixel size. The Piranha XL camera
has a binning feature that produces rapid adjustment to a lower object pixel resolution without
having to change the optics, illumination intensity, or encoder pulse resolution.
Binning is a process whereby adjacent pixels are summed. The Piranha XL camera can support 1 x
2, 2 x 1, and 2 x 2 binning (vertical x horizontal). Vertical Binning is achieved by the camera
ignoring every other encoder pulse. Horizontal binning is achieved by averaging adjacent pixels in
the same line. Therefore, 2x binning results in the object pixel doubling in size vertically,
horizontally, or in both axes, as selected by the Binning feature. When selecting binning, the
current exposure time is retained so no change in light level is required. As every other encoder
pulse is dropped with 2x vertical binning, scan speed can double without exceeding the maximum
specified line rate, or the maximum line rate as dictated by the selected exposure time. Horizontal
2x binning will halve the amount of image data out of the camera. This can be used to save
processing bandwidth in the host and storage space by creating smaller image file sizes.
Figure 8: 2x2 Binning
For the Piranha XL camera, the default binning value is 1 x 1.
Using Area of Interest to Reduce Image Data & Enhance Performance
See the section Image Format Control Category in Appendix A for GenICam features associated
with this section and how to use them
Relevant Features: AOI Port Selector, AOI Count, AOI Selector , AOI Offset, AOI Width
If the camera’s field of view includes areas that are not needed for inspection (also refer to the
description in the 0 Flat Field Calibration Region of Interest), then the user may want to ignore this
superfluous image data. Eliminating unwanted image data that is present in the camera’s field of
view reduces the amount of information the host computer needs to process. It may also result in
an increase to the maximum allowable line rate when using 12 bit output data.