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High-resolution Camera Link image acquisition and pre-processing
for color LINE-SCAN inspection
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The Grablink Quickpack ColorScan provides on its FPGA the accelerated image pre-processing
functions necessary for color scanning applications. Color document scanning or PCB inspections
are then considerably eased and accelerated providing on the fly enhanced images ready for further processing.
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Image pre-processing accelerated by the FPGA:
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Scan-delay compensation, Shading correction,
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Look-up table transformation, White balance
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Base configuration: 24-bit at up to 60 MHz
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Maximum processing rate: 50 MPixel/s (150 MB/s)
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Output formats: RGB 24- and 32-bit packed - RGB 24-bit planar
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128 MB on-board memory
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Form factor: Conventional PCI 64-bit 66 MHz
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MultiCam drivers for Microsoft Windows® and Linux
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Image pre-processing functions accelerated by the FPGA
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Scan-delay compensation
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A trilinear color camera captures the luminance information at three light wavelength
ranges from three distinct locations. A gap between these lines analyzed in red, green
and blue is resulting due to the sensor geometry and the optical arrangement. The scan-delay
compensation offered in the Grablink Quickpack ColorScan gathers the color information coming
from three different locations in order to reconstruct consistent RGB information.
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On the fly shading correction on the three color components
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After the calibration phase, the six profiles are compiled into the frame grabber hardware
to correct the distortions. This correction is handled applying a multiplicative -gain-
and an additive -offset- correction to each pixel issued in the scanned signal.
This processing drastically improves the quality of the acquired images facilitating the application processing.
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Three 8-bit x 8-bit Look-up Table Transformer for the R the G and the B components
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They include the following setup methods: exhaustive definition of the transformation law,
parametric shaping of the transformation law through a few intuitive controls, white balance by
RGB gain correction implemented as special transformation laws.
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White balance correcting for RGB channel imbalance
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This imbalance can be due to differences in sensitivity of sensors, to the illumination system
and to the optical filter. After calibration, a correcting gain is applied to each color channel
to compensate for unbalanced R, G and B components.
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| Raw acquired image |
Scan-delay compensated |
Scan-delay compensated and shading corrected image |
Scan-delay compensated, shading corrected and white balanced image |
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Image acquisition and transfer
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Support of Base configuration for RGB LINE-SCAN camera
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Two kinds of RGB imagers are supported: trilinear and 3-CCD.
Only RGB single-tap with Base_1T24 tap configuration is supported.
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Downweb resampling feature for shutter-less camerasa
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Most high-resolution color line-scan cameras have no electronic shutter capability.
Consequently, they have to be operated at a constant cycling rate in order to maintain
a constant sensitivity. The Grablink Quickpack ColorScan implements a unique downweb
resampling feature yielding a defined aspect ratio irrespective of web speed variations.
A built-in rate converter accommodates an off-the-shelf motion encoder to control the line
acquisition process, enabling any programmable aspect ratio, including perfect square pixels.
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2 I/O lines available externally on a DB-9 connector
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I/O electrical style
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I/O electrical style and function
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- 2 isolated multi-mode bidirectional I/Os and associated isolated 5V power supply
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- TTL trigger or page trigger input
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• Input: isolated TTL, isolated 12V
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- Opto-isolated trigger or page trigger input
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• Output: isolated TTL, isolated open collector, isolated open emittor
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- TTL strobe output
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- 5V and 12V power supplies
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- Opto-isolated strobe output
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- TTL line trigger or encoder input
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- Opto-isolated line trigger or encoder input
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 Top
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Euresys products comply with the RoHS Directive
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Copyright © 1989 - 2009 Euresys s.a. All rights reserved - See Euresys Terms and Conditions
For questions about Euresys Company and Products please contact info@euresys.com
RPM Liège 0437408137 - TVA BE 437 408 137 - RC Liège 168 568
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