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Image Engineering 

Seite 

12

 von 

19

 

 

Editing Analysis Parameters: 

Example: 

<Alpha

 

IsInvariant

=

"false"

 

UseAsStartValue

 =

"false"

 

Unit

=

"Degree"

>

0

</Alpha>

 

 

The "IsoInvariant" flag indicates if the following value is calculated during calibration or set to a fixed 

value. If it is set to "false," the value is calculated in each calibration. To set it to a fixed value, write "true" 

instead of "false" and change the value ("0" in this example) as desired. The new value will be used in 

every calibration until you set the "IsInvariant" flag back to "false" again. 

With the "UseAsStartValue" flag, you can set a start value for the analysis. If you set the flag to "true," the 

following value will be used as the start value. If you set the flag to "false," the default 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 containing the file 

 select the file and 

click "open." 

 

Loading images for analysis 

Click File 

 Load images (ctrl+o) 

 navigate to the folder containing the images 

 select one or multiple 

images and click "open." 

In its current state, the software supports the analysis of 8bit and 16bit images. 

The following file types are supported (debayered images): .TIFF, .JPG, .PNG 

Images for analysis must be taken so that the point grid fills the sensor completely. 

5.3.1 

Delete images 

Right-click on the selected image in the list to open a delete option.  

 

 

 

 

 

 

 

 

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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