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Image Engineering 

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4

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19

 

1  INTRODUCTION 

Important information: Read the manual carefully before using the device.  

Inappropriate utilization may cause damage to the device.  

 

 

Conformity 

We, Image Engineering GmbH & Co. KG, hereby declare that GEOCAL/GEOCAL XL corresponds to the 

essential requirements of the following EC directives: 

2011/65/EU - RoHS 2  

2014/35/EU - Low Voltage   

2014/30/EU - Electromagnetic Compatibility  
 
 

And standards or normative documents: 

 

EN 61326-1:2013 

– 

Electrical equipment for measurement, control, and laboratory use - EMC 

requirements - Part 1: General requirements

   

EN 61000-3-2:2014 - 

Electromagnetic compatibility (EMC) - Part 3-2: Limits - Limits for harmonic 

current emissions 

EN 61000-3-3:2013 - 

Electromagnetic compatibility (EMC) - Part 3-3: Limits

 

EN 62471-2:2009 - 

Photobiological safety of lamps and lamp systems

  

DIN EN 60825-1 - 

Safety of laser products - Part 1: Equipment classification and requirements

 

 

 

Intended use 

GEOCAL/GEOCAL XL consists of an illuminating hardware device and software for geometric calibration 

of camera systems. The GEOCAL software is used for calculating the calibration parameters from a 

single image taken with a camera system of the point grid generated by the GEOCAL hardware device. 

 

Only suitable for indoor use. 

 

Place the system in a dry and constant tempered environment. Avoid high air humidity. 

 

 

General safety information 

WARNING!

 GEOCAL / GEOCAL XL uses a laser diode for illumination. 

LASER RADIATION CLASS 1M LASER PRODUCT 

 

 

Do not

 stare into the beam 

 

Do not 

view directly with optical instruments 

 

Do not

 open the housing of GEOCAL / GEOCAL XL under any circumstances 

 

Содержание GEOCAL

Страница 1: ...Image Engineering GmbH Co KG Im Gleisdreieck 5 50169 Kerpen Germany T 49 2234 2273 99 99 1 0 F 49 2234 2273 99 99 1 10 www image engineering com GEOCAL GEOCAL XL User Manual 22 November 2021 ...

Страница 2: ...table lenses 7 3 3 2 Exposure 8 4 DIFFERENCES BETWEEN GEOCAL AND GEOCAL XL 9 Why a larger version of the GEOCAL 9 5 OPERATING INSTRUCTIONS SOFTWARE 10 Installing GEOCAL software 10 Configuration file XML 10 Loading images for analysis 12 5 3 1 Delete images 12 Image analysis 13 Saving results 14 Export Grids 15 Plotting 15 5 7 1 Grid view 15 4 7 2 Distortion curve 15 5 7 2 Quiver plot 15 5 7 3 2D ...

Страница 3: ...instructions 17 Power circuit modification for production line use 17 7 DATA SHEET 18 Overview 18 Features 18 7 2 1 Hardware 18 7 2 2 Illumination 18 7 2 3 Software 18 General description hardware 19 Requirements on the device under test DUT 19 ...

Страница 4: ...013 Electromagnetic compatibility EMC Part 3 3 Limits EN 62471 2 2009 Photobiological safety of lamps and lamp systems DIN EN 60825 1 Safety of laser products Part 1 Equipment classification and requirements Intended use GEOCAL GEOCAL XL consists of an illuminating hardware device and software for geometric calibration of camera systems The GEOCAL software is used for calculating the calibration p...

Страница 5: ...report Commissioning Remove the packaging material The power socket and the main power switch are located on the back side of the device next to the USB type B socket Connect GEOCAL GEOCAL XL to a power outlet and switch it on Please note that the blue LED next to the power switch indicates that the power line is active and that GEOCAL is ready for operation Install the latest GEOCAL software Wind...

Страница 6: ...not available use the automatic exposure mode The image should be saved in a lossless format for best results TIFF format is recommended and PNG and JPEG lossy are also supported If you convert RAW image data to another format ensure the image is debayered in the process The autofocus must be turned off Since GEOCAL GEOCAL XL uses a collimated light beam virtually originating from infinity the app...

Страница 7: ...ole image and that the border of the DOE is not visible The top side of GEOCAL GEOCAL XL and the top side of the camera must have the same orientation A rotation of the camera around the optical axis of approx 2 will be tolerable No further alignment steps are necessary The camera s translation does not influence the mapping of the light points The camera rotation to the DOE is part of the calibra...

Страница 8: ... Possible solutions Set the ISO to the lowest native value available ISO 100 for most cameras Stop down the aperture if possible If the image is still too bright you could use an ND Filter to reduce the amount of light reaching the image sensor The intensity dropoff is too steep towards the edges of the image and no more points are visible This problem may occur for ultra wide angle lenses If the ...

Страница 9: ...en the device under test DUT can not be placed directly in front of the DOE for example when a car s windshield is involved As mentioned in chapter 3 3 1 Camera position and suitable lenses the generated point grid needs to cover the entire camera sensor to provide a reliable calibration Figure 6 Use case for the larger DOE provided in the GEOCAL XL As illustrated in Figure 6 above the windscreen ...

Страница 10: ...er MinF This parameter describes the stop strategy at which optimization value the analysis is stopped 0 0 10 0 default 1 0 The smaller the value the more accurate the analysis becomes but the analysis time also increases Control Parameter MinDelta This parameter describes another stop strategy When the change of the optimization value between two iterations is less than the delta the analysis sto...

Страница 11: ...f the device under test in X and Y are determined during calibration and output as results in pixel dimensions Nevertheless they can be set to a fixed value for troubleshooting Analysis Parameter Skew coefficient The skew coefficient is set to 0 by default and is non zero if the image axes are not perpendicular Analysis Parameter Principal Point The principal point optical center describes the poi...

Страница 12: ...t value will be used The default is always 0 except for the focal length and principal point For the focal length an estimate is automatically made after the detection For the principal point the center of the image is taken as default If the IsInvariant flag is set to true the UseAsStartValue flag is ignored Loading a config file Click File Load configuration ctrl c navigate to the folder contain...

Страница 13: ...essing Show Detected Grid next to the progress bar you can display a visualization of the detected undetected points For a successful analysis detecting all of the points is not necessary If auto detection fails you can make a manual ROI selection by setting the checkmark in the Detection analysis section 2 Five preset ROIs will then appear in the visualized image The size and position of these RO...

Страница 14: ...he Image section 4 Please find an explanation of the values in chapter 4 2 of this manual The RMSE of the calibration is also included in the result table If needed you can clear the result table by clicking clear table Under the tab Distortion curve you also get a graphical visualization of the determined distortion of the camera Geometric Distortion vs Field Saving results You have the option to...

Страница 15: ...The curve is calculated from the distortion coefficients and shows the grad of the analyzed distortion 5 7 3 Quiver plot The quiver plot shows the direction of deviation The respective arrows indicate how the detected points are located concerning the reprojected points 5 7 4 2d Color scatter This plot shows a grid of color coded points with each point representing the distance ratio between detec...

Страница 16: ... 19 Quit To exit the software click File Quit ctrl q or simply close the window TRADEMARK AND COPYRIGHT Trademarks Windows is a registered trademark of Microsoft Corp Copyright Information See separate Terms and Conditions document ...

Страница 17: ...of it Contact Image Engineering if assistance for disposal is required Power circuit modification for production line use If you plan to use your GEOCAL GEOCAL XL on a production line we offer the option of modifying the unit to eliminate the need to press the switch to turn it on and off After the modification moving the switch to the ON position is sufficient The unit will immediately start oper...

Страница 18: ... x 170 mm GEOCAL XL approx 850 mm x 244 mm x 270 mm Mounting points GEOCAL 3 x M5x0 8 tapped holes in the base plate GEOCAL XL 10 x M5x0 8 tapped holes in the base plate 7 2 2 Illumination CAUTION DO NOT LOOK DIRECTLY INTO THE LIGHT SOURCE Light source Frequency stabilized diode laser Wavelength 633 nm Output power 5 mW Laser Class diode only 3B Laser Class device as sold 1M Lifetime 10 000h Warm ...

Страница 19: ...5W 5V 5A Pmax 2W Ports USB type B Weight GEOCAL approx 4 5 kg GEOCAL XL approx 10 kg Operating conditions 15 35 C Requirements on the device under test DUT Max dimensions GEOCAL max diameter of the camera lens 77 mm GEOCAL XL max diameter of the camera lens 155mm Usable FoV Approx 30 180 deviating values will have to be tested ...

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