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

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32 • The Piranha XL XDR Camera
(Note: this feature is only available on the 06X and 12X models of camera.)
The camera has 16,352 active pixels. 16 pixels at each end are reserved for dynamically optimizing
imaging data. When it is critical for an application to have 16,384 active pixels of image data, the
Image Magnification feature can be used. When this feature is active, the 16,352 pixels are
magnified by 1.002x (16384/16352). This results in the 16 black pixels at each end being replaced
with image data, resulting in a 16,384 pixel wide image.
Note that the image magnification algorithm has a slight filtering effect that may reduce the
contrast of very small features. However, it also has the effect of reducing noise.
When the camera powers up, it will default to the Image Magnification Mode Off, as this will be
backwards compatible with the operation of earlier cameras.
*This feature is only available in the PX-HM-16K06X and PX-HM-16K12X camera models.
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.