Artec AMK User manual

Artec Metrology Kit
Version 1.0 Manual

Introduction
About this manual
Starting the software
Managing components
Templates
Settings: Image measurement
Settings: Adjustment
Settings: Point assignment
Settings: Bundle adjustment
Quality criteria
Cameras
Camera data
Calibration data
Image transfer
References
Scales
Settings
Camera settings
Performing a measurement
Image selection
Dashboard
Image measurement
Pre-orientation
Point assignment
Adjustment
Individual quality criteria
3D view
Measured images
Points
Evaluating results
Troubleshooting
Bundle report
Post-processing and repeating a measurement
Artec Metrology Kit

Version 1.0 Manual4
Introduction
The Artec Metrology Kit (AMK) is a hand-held optical coordinate measuring system used forthemobile
inspection of parts and components. The AMK system is typically used tomeasure objects
uptoandincluding vehicle size.
The integrated software of the measuring system enables fully automatic evaluation ofdigital images,
regardless ofthe camera type employed. The AMK software is integrated intheArtecStudio software
can be easily adapted to different measuring tasks and optimized tosuit individual user requirements.
The software features a “one-button-click” solution for use in production environments. Experts are also
able toperform their complex measuring tasks by means of parameterization.
By combining absolute precision with the mobility and flexibility of a photogrammetric measuring system,
the ArtecMetrology Kit is suitable for a wide range of applications in many different sectors:
•Inspection of objects, machine parts and components
•CAD comparisons
•Creation of references for 3D scanners and Artec Studio applications
•Deformation or distortion analyses
Entry Kit Professional Kit
20 Megapixel camera 30.3 Megapixel camera
Reference cross and bar combined Separated reference cross and scale bar
Point accuracy 4µm + 5µm/m Point accuracy 2µm + 5µm/m
Volumetric accuracy 25µm + 25µm/m Volumetric accuracy 15µm + 15µm/m
Basic range of measurement accessories Additional measurement targets
Metrology Kit plugin for Artec Studio Metrology Kit plugin for Artec Studio
Adjustable camera settings Adjustable camera settings
Differences between the two available kits
Table 1. Difference between the Artec Metrology Entry & Professional Kits

5Version 1.0 Manual
About this manual
Starting the software
This user manual is an integral part of the product. Carefully read and follow the instructions given
inthismanual. Maintenance and repair work of the system must only be carried out byanauthorized
service technician or a staff member of Artec 3D.
This manual including all its parts is subject to copyright. Copies thereof, even in the form ofextracts,
may only be made with the express permission of Artec 3D. This manual has been carefully prepared.
However, we cannot guarantee the correctness of the contents. Since mistakes cannot be completely
avoided despite all efforts, we are grateful for any feedback inthisrespect.
The software is integrated in Artec Studio. To launch the software, go to the File menu inArtecStudio,
and click on the ‘Generate reference cloud...’ option.
The software is only available after you have activated your Artec Metrology Kit intheArtecInstallation
Center, using your MyArtec account.
www.artec3d.com
[e-mail]
Version 1.0, Subject to alterations.
Copyright 2022 by Artec 3D
4 Rue Lou Hemmer, L-1747 Senningerberg, Luxembourg

Version 1.0 Manual6
Managing components
Figure 1.Component management window of the Artec Metrology Kit software
The operating elements specied in Table 2 can be used to alter the representation and layout
ofthecomponents in the overview:
Table 2. Icons for changing the component layout
Icon Function
Tiled view whith large icons
List view
The component management window can be used to create measurement templates along with
allthenecessary components. It can also be used to make general settings fortheArtecMetrology Kit.
The operating concept forthisoverview is thesame for every component. Themeaning oftheicons
andstructure of the overview pages are therefore explained at this point inthemanual:
Above the component overview is a search box, which can be used to enter text dening how
thecomponents are to be ltered. The components can also be sorted by name, creation orchange date
in ascending and descending order.
The right-hand window displays details for the selected component, such as the creation andchange
date along with an optional description of the component.

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Describes the functions of the icons:
Icon Function
Create new template
Import
Export
Edit
Duplicate
Delete
Table 3. Icons in the component management window
Templates
Templates can be used to compile all components required for a measurement and to make allnecessary
settings for the measurement.
Selecting Templates in the component menu bar opens the overview page for the templates. Alist of all
existing templates is displayed here.
When a template is newly created or opened for editing, the Template data window opens. Thiswindow
isdivided into three tabs:
•Details
•Components
•Settings
Use this optical measurement solution to analyze the deformation characteristics of materials under
different environmental conditions and loads – processes where a short measuring time is crucial.
The Metrology Kit is great for analyzing the geometrical changes of things like storage tanks, vehicle
components, or design prototypes.

Version 1.0 Manual8
Figure 2. Templates
A template consists of a combination of components (scales, references, andcameras), which can be
viewed and selected on the Components tab.
Figure 3. View of the selected components
Click to change the component selection. A tree view of all available components appears. Entire
groups ofcomponents or individual components can be selected or deselected here. Individual
components can be removed fromtheoverview by clicking .

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Figure 4. Component selection
The Settings tab can be used to adjust measurement parameters and dene quality criteria forassessing
the success of the measurement. A description of the settings and their effects isprovided inthefollowing
chapters.
The Settings tab can be used toadjust measurement parameters anddene quality criteria forassessing
thesuccess of the measurement.
Settings: Image measurement
Figure 5. Image measurement settings Table
Managing components

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Function Description
Measure only new images The image measurement is only carried out for newly added images. Old images are skipped.
If this option is not activated, the software carries out another image measurement for all
existing images, but this is only useful if the measurement parameters have been modied.
Itisrecommended to activate this option.
Example:
At the end of a measurement, a user realizes that some targets have been insufciently
captured. He takes 3 new images of this area. If this option is activated, the software carries
out an image measurement only for these 3 images and keeps the results oftheother images.
Bit code of targets Target coding: Users can select between 12-bit, 14-bit, 20-bit and Anco code oracombination
of Anco and 14-bit code. Depending ontheselected code, a valid point number range is
produced, which canbe further restricted under Index values (seebelow). Generally, only 14-
bit coding is used with the AMK software.
Target color Users can select between black and white targets. Simultaneous measurement of black and
white targets isalso possible.
Point numbers The range of the used point numbers can be restricted such that coded targets outside the
specied range are ignored.
Inner diameter of coded targets [mm] Entering the inner diameter of the coded targets prevents code segments being falsely
detected as non-coded targets. We recommend that users always specify the inner target
diameter of the smallest coded target to be used. If this function is to be deactivated, thevalue
0 must be entered asthe target diameter.
Allow very small targets If the images contain very small points (only ~3 pixels), this option should be activated.
However, this raises the risk ofincorrect measurements in the images, e.g. due to minimal
reflections, which increases the time required forpost-processing.
Image coordinates from le Instead of measuring in new images, it is also possible toimport the2Dimage coordinates
from a previous measurement (*.phc le).
Filter noisy images Activates additional lters to perform measurements in very noisy images (e.g.underwater
photogrammetry).
Contrast In the case of images with poor contrast, i.e. with a low grey scale value difference between
the target center and contrast ring, the value can be reduced to allow a target measurement to
be performed.
Min. target diameter [pixel] Minimum diameter that a target in the image must have toensure that itis detected
Recommendation: Increase the value when many incorrect points aredetected (reflection, texture of
the component).
Max. target diameter [pixel] Maximum size required for the diameter of a target intheimage toensure that this target is
detected.
Edge operator Users can select between Edge3, Edge5, Edge7 and Edge9. With higher values, blurred edges
are also detected.
Search rays to detect ellipses To detect the exact edge of an ellipses, a specic number ofsearch rays are used to examine
the ellipses. The number of search rays can be 32, 64, 128 or 256. The greater thenumber of
search rays employed, the more detailed theresult, but the higher thecomputation effort.
Max. deviation oftheellipses [pixel] Maximum permitted deviation of the measured ellipses from the shape of an ideal ellipse
Recommendation: Increase the value to perform measurements invery noisy images or when using
targets with poor print quality.
Lists the image measurement functions:

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Managing components
Function Description
Max. quotient oftheellipses axes Maximum permitted ratio between the long and short main axis.
Recommendation: Increase the value to be able to perform measurements in images that have been
taken at a very flat angle.
Size of reference in image Ratio between the reference size and the area of interest ofthe image. Options: large, standard
and small.
Images without measured targets Marks images where no targets have been measured, assuccessfully measured
andorientated. As a consequence, the software does not try to measure or orientate these
images again when an existing measurement is continued. This option is mainly relevant for
automated processes.
Table 4. Image measurement settings
The Adjustment tab can be used toset the parameters for the adjustment.
Settings: Adjustment
Figure 7. Settings for image orientation, point assignment and bundle adjustment
Lists the adjustment functions:
Function Description
Orientate only new images The pre-orientation is performed only for as yet non-coded images.
Delete old point assignment When new images are added, the previous point assignment is deleted and a new point number is
assigned to all measured, non-coded targets (including in new images). Ifthisfunction isdeactivated,
only coded targets are calculated in new images.
Table 5. Adjustment settings

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Settings: Point assignment
Settings: Bundle adjustment
Lists the parameters for the point assignment:
Lists the parameters for the bundle adjustment:
Function Description
First non-coded point number Species the number from which the numbering of non-coded marks begins. Default value is
1000.
Point assignment Species the accuracy of the point assignment.
The more accurate the point assignment, the slower the assignment becomes.
Min. distance of points Species the minimum three-dimensional distance of two measurement points. Ifthecenters
of two points are closer together than the specied value, one of the two points is ignored.
Limit for point number matching Species the limit value for the search range of the point search im mm for each point ofthe
reference data set in the current data set / thecurrent capture. If a point is found inthis range,
the point number ofthe reference data set is assigned to it. If there isnopoint in this range,
thepoint receives a new number.
Function Description
Min. amount of rays per point before
theadjustment
Points with fewer rays than the minimum quantity are excluded from theadjustment.
Max. distance for nearby scale points Up to the specied distance, the system searches for the corresponding coded targets inthe
environment of the endpoints to determine non-coded scales.
Finish adjustment ataSigma0of When the specied Sigma0 is reached, the adjustment is stopped prematurely. Thisoption
can be used to reduce the time taken fortheadjustment.
Weight of coded targets Factor used for the weighting of residual errors for coded targets.
The weighting for coded targets is to be regarded as relative totheweighting
ornon-coded targets. The default value (neutral) is 1.
Weight of non-coded targets Factor used for the weighting of residual errors for non-coded targets.
The weighting for non-coded targets is to be regarded as relative totheweighting forcoded
targets. The default value (neutral) is 1.
Table 6. Point assignment settings
Table 7. Bundle adjustment settings

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Managing components
Upon completion ofameasurement, the level of success ofthemeasurement is indicated via acolor
code to enable rapid assessment of the results:
Some criteria for this assessment can be adjusted. These criteria serve as indicators for the quality
ofameasurement. Default values based on empirical values forstandard use of the AMK software are
preset.
Quality criteria
GreenGreen = successful YellowYellow = moderate success RedRed = failed
Figure 7. Quality criteria settings
Lists all criteria and their meanings:
Criterion Description
Check Sigma 0 Green colored measurement result: The Sigma 0 is below this value. The result is classed as successful. Limit
value as of which the result for Sigma 0 is classed as successful. If the Sigma0 is less than or equal to this value,
the measured result forthis criterion appears in green.
Red colored measurement result: The Sigma 0 is above this value. Thexresult is classed as unsuccessful.
Yellow colored measurement result: The measurement result isbetween the two limits.
Check RMS / Median The RMS value denotes the root mean square of the established standard deviations.
If this option is activated, the program checks whether the RMS for acomponent isgreater than 3 times the
median of the component.
If this is the case, the status of the measurement appears in red otherwise the status appears in green.
The median and RMS for each component should ideally be identical. Ifnot, this indicates individual points with
signicant deviations.
Table 8. Quality criteria for the measurement

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Table 8. Quality criteria for the measurement
Criterion Description
Scales deviations Deviation of the measured distance of a scale from the distance specied for the scale.
Green colored result: The entered limit value ismet.
Yellow colored result: The entered limit value is not met.
Red colored result: The MPE specications for measuring systems (MPE= maximum permissible error)
are also not met.
In general, it is checked whether at least one scale bar has been successfully measured,
if scales are included in the template.
Check the number of points Minimum number of points to be measured. The number is split into coded
and non-coded targets.
If the minimum number is not met, the result of the measurement ishighlighted in red .
Cameras
When a camera is newly created or edited, a window opens for entering all relevant camera data.
Thecamera properties are split into the following sections:
•Camera data
•Calibration data
•Image transfer
These sections are described in the following chapters.
Camera data
The camera data to be entered depends of the selected camera type. If the type is C1, a camera ID has
to be entered. Resolution, sensor size and focal length are completed automatically. Ifthetype is user
dened and no camera data or distortion parameters from previous calibrations are available, the image
resolution and sensor size must be obtained from the camera description and the focal length of the used
lens must be entered.

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Managing components
Lists the available information:
Information Description
Camera name Name of the camera.
The camera is displayed under this name in the AMK software.
Camera description Brief description of the camera (optional).
Camera type Type of the used camera. Each type offers different options for the camera data andtheimage transfer.
•C1 — 50 Megapixel (full resolution for larger distances)
•C1 — 22 Megapixel (standard resolution for fast data transfer)
•C1 — 12 Megapixel (low resolution for very fast data transfer)
•User dened
For (very) fast data transfer, the standard and low resolution are recommended. Compared tothe full resolution,
these settings still provide a high data quality.
Camera ID Identication number of the camera. This number is required to establish a Wi-Fi connection
forC1cameras. Only for C1 camera types.
Resolution [pixels] Width and height of the sensor in pixels. Only for user dened camera types.
Sensor size [mm] Sensor dimensions in millimeters. Only for user dened camera types.
Focal length [mm] The focal length depends on the selected lens. This information isnormally indicated inthe lens.
Onlyforuser dened camera types.
Table 9. Information for the camera data

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Calibration data
The calibration data (distortion parameters) can be imported or entered manually. Whenacamera
isimported, the calibration data is also transferred.
By activating/deactivating thecheckboxes for the individual parameters, users can dene which
parameters are calibrated, i.e.calculated, during the evaluation. An appropriate selection ofdistortion
parameters is required here. Itisgenerally recommended that users adopt thestandard conguration
forthe example shown in Figure 8.
For each AMK Professional system, special IOR data (interior orientation) is supplied that may deviate
from the standard. This serves to increase the accuracy of measurements.
When working with a pre-calibrated camera system, the selections for the relevant parameters must
becancelled. This will ensure that the previously calibrated data is used in the evaluation.
Any calibration data that is not to influence the evaluation must be deactivated.
Figure 8. Camera data / Calibration data

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Managing components
References
Points with a known geometry can be used as a reference in a measurement, either instead
oforincombination with scales. When reference points are used, scales only serve to check
themeasurement results. References can contain coded and non-coded points.
When a reference is newly created oredited, a window opens for entering all relevant reference data.
Figure 9. Creating a reference
Lists the available tabs for dening a reference:
Tab Function
Details Entry of the name and (optional) description of the reference.
Display of the creation and change date of the reference.
Points Entry and editing of the coordinates of the reference object. Manual entry of the coordinates under Points.
It is also possible to import/export the coordinates of the reference object from/into acoordinate
le (*.obc). In this case, a le dialogue opens for selecting an .obc le to be imported. The data from
theselected le is then displayed in the Data import window. Inthis window, the coordinates can be
viewed and a unit selected forthedata import. Individual rows can be specied to select only a part
ofthecoordinates. The selected coordinates can then be imported using .
3D Display of the point cloud of the reference object as well as rotation, zooming in/out andshifting
ofthepoint cloud using the functions described in the chapter 3D view.
Table 11. Creating a reference

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Scales
Scales are objects with two coded or non-coded points at a dened distance from one another. Unlike
the reference cross, the distance dened as the scale is included in the calculation as heavily weighted
additional information. This information facilitates the high-precision scaling ofthemeasurement object
sothat at least one scale must be specied when creating ameasurement template.
When a scale is newly created oredited,
a window opens for entering all relevant
scale data.
Figure 10. Creating or editing a scale
Lists the available elds for creating or editing a scale:
Field Description
Scale name Entry of the name under which the scale is displayed in the list ofavailable scales.
Point 1, Point 2 Entry of the numbers of the scale end points.
Distance [mm] Entry of the distance between the end points specied on the scale (in [mm]).
Use non-coded targets nearby Activating this option enables the measurement of a scale with non-coded end points. For this purpose, the
elds Point 1 and Point 2 are used to specify which coded targets are in the proximity of the end points of the
non-coded scale. In the vicinity of these coded targets, the nearest non-coded target is then assigned to the
scale in the measurement
and used to determine the distance.
Description Entry of an optional description to enable easier identication of the scale, inthecomponent selection for
instance.
Create time / Change time Automatic insertion of the creation and modied date.
Table 12. Creating or editing a scale
To use the distances of thereference cross
asa scale, these must also be introduced
as ascale with×thecorresponding point
numbers. However, these distances are not
calibrated with high precision.

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Managing components
Figure 11. General settings
General settings for the AMK software can be made here.
Lists the available settings:
Setting Description
Language Display language of the software. After changing this setting, the program must be restarted.
Theme Switch between a light and dark theme for the user interface.
C1 Pilot Lock the user interface of the C1 Pilot application for user interaction while it is used byAMK
software.
Units and decimal places Set the units and decimal places of data and angles.
Backup Activate a backup of measurement images. All measurement images are saved intheselected
directory. This is additional to the regular storage within the project le.
This setting leads to a higher memory consumption.
Table 13. General settings for the AMK software
Settings

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Camera settings
Before starting a measurement, the camera settings must be checked. The settings forthecurrently
selected camera can be accessed on the component management window byclicking .
Before the actual measurement, two to three test images are taken of the signaled measurement object
(from the front and at an angle). This ensures optimum capture of the measured images. Thischeck
isoptional in the case of recurring measuring tasks or when measuring identical objects in direct
succession.
This process is not essential when using retro targets since the influence of ambient light isnegated by the camera
settings and flash. When using standard targets, however, the measurement isaffected by the ambient light.
Testimages should therefore be taken before every measurement inthe case of changing conditions.
For this purpose, the camera is used with the currently selected template. In the displayed window
(Figure12), individual images captured with theselected camera can be viewed infull resolution.
The used images can be loaded from a le or from an SD card using . Transfer via Wi-Fi is also possible.
When using the Wi-Fi mode C1, an additional camera icon appears at the bottom left edge toindicate
theconnection status of the relevant camera: green indicates an established connection while red means
that no connection is active.
Figure 12. Camera settings with limit values highlighted in color