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7 DATA SHEET

Overview

Product name

GEOCAL / GEOCAL XL

Principle

DOE-based geometric calibration of digital cameras

Features

7.2.1

Hardware

Diffractive Optical
Element (DOE)

Generates a very evenly distributed grid of light points,
virtually originating from infinity

Output window

GEOCAL:

Usable aperture: Ø 77 mm

GEOCAL XL:

Usable aperture: Ø 155mm

(camera lens needs to have an equal or smaller diameter)

Usable FoV

Approx. 30 – 120° (more extreme values need to be tested)

Dimensions (l x w x h)

GEOCAL:

approx. 575 mm x 144 mm 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)

Laser Class (device as
sold)

Lifetime

> 10.000h

Warm-up time

Not required

7.2.3

Software

System requirements

PC with Windows 7 operating system (or higher)
USB port

Functions

•

Load multiple images

•

View selected image

•

Perform calibration

•

Overlay detected point grid

•

Various tools for result visualization

•

Export results (CSV and XML)

Output data

Camera intrinsic and extrinsic data, the orientation of DOE

Summary of Contents for GEOCAL

Page 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 ...

Page 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 ...

Page 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 ...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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 ...

Page 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 ...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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 ...

Page 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...

Page 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 ...

Page 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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