Image Access WideTEK Art Instructions for use

Best Practices

Best Practices WideTEK 36ART Page 2 of 26
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Image Access GmbH. Scan2Net®, Scan2Pad®, WideTEK® and Bookeye® are registered trademarks of Image Access.
1. Table of Content
1. Table of Content .............................................................................................................................. 2
1.1. Table of Figures ................................................................................................................... 3
2. Revision History ............................................................................................................................... 4
3. About this Manual ........................................................................................................................... 4
3.1. Purpose................................................................................................................................ 4
3.2. Corrections .......................................................................................................................... 4
3.3. Warranty.............................................................................................................................. 4
3.4. Safety................................................................................................................................... 5
4. Concept of the WideTEK 36ART....................................................................................................... 6
4.1. Scanner Main Body.............................................................................................................. 6
4.2. Scanner Head with Cameras................................................................................................ 6
4.3. Scanning Table..................................................................................................................... 6
5. Scan Table Position.......................................................................................................................... 7
5.1. Rubber Wheel Transport ..................................................................................................... 7
5.2. Cleaning the Rubber Wheel Transport................................................................................ 7
5.3. Insert/Remove Scanning Table without Tools..................................................................... 9
5.4. Location and Weight of Objects ........................................................................................ 10
6. The Control Panel .......................................................................................................................... 11
6.1. Table Movement Control .................................................................................................. 11
6.2. Head Movement Control................................................................................................... 12
6.3. Auto Focus Control ............................................................................................................ 13
6.4. Correct Positioning for Auto Focus.................................................................................... 14
6.5. Scan Start and Length Control........................................................................................... 15
6.6. Operator Defined Scanning Length ................................................................................... 15
6.7. Start Scan........................................................................................................................... 15
7. Software Stitching.......................................................................................................................... 16
8. Various Scanning Scenarios ........................................................................................................... 17
8.1. Scanning Thin Objects ....................................................................................................... 17
8.2. Artifacts Scanning Thin Objects......................................................................................... 18
8.3. Scanning Thick Objects ...................................................................................................... 19
8.4. Artifacts Scanning Thick Objects ....................................................................................... 20
8.5. Scanning Structured Objects ............................................................................................. 21
8.6. Artifacts Scanning Structured Objects............................................................................... 22
9. 3D Texture Scanning ...................................................................................................................... 23
9.1. The Perfect Illusion............................................................................................................ 24
10. Optional Table Extension............................................................................................................... 26

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1.1. Table of Figures
Fig. 1 Rubber wheel transport................................................................................................................ 7
Fig. 2 Never place objects on the runway .............................................................................................. 8
Fig. 3 Correct placement of object ......................................................................................................... 8
Fig. 4 Insert the scanning table............................................................................................................... 9
Fig. 5 Correct positioning and weight................................................................................................... 10
Fig. 6 Incorrect positioning and weight ................................................................................................ 10
Fig. 7 Control panel............................................................................................................................... 11
Fig. 8 Control panel head...................................................................................................................... 12
Fig. 9 Auto Focus using both lasers ...................................................................................................... 13
Fig. 10 Auto Focus using one laser ....................................................................................................... 13
Fig. 11 No Auto Focus used .................................................................................................................. 13
Fig. 12 Correct positioning under laser ................................................................................................ 14
Fig. 13 Incorrect positioning under laser.............................................................................................. 14
Fig. 14 Default scanning length ............................................................................................................ 15
Fig. 15 Quality tab................................................................................................................................. 16
Fig. 16 Default setting, Auto Focus on and clearance at 100mm......................................................... 17
Fig. 17 Artifact caused by an object under the laser............................................................................ 18
Fig. 18 Wavy target scanned with Fixed Focus..................................................................................... 18
Fig. 19 Wavy target scanned with Auto Focus ..................................................................................... 18
Fig. 20 Control panel showing thick object .......................................................................................... 19
Fig. 21 Fine art scan with frame ............................................................................................................ 20
Fig. 22 Scanning at Fixed Focus ............................................................................................................ 21
Fig. 23 Structured target scanned with Fixed Focus ............................................................................ 22
Fig. 24 Same target scanned with Auto Focus...................................................................................... 22
Fig. 25 Normal scan of crumbled gift wrap paper................................................................................ 23
Fig. 26 3D scan at positive 3D............................................................................................................... 23
Fig. 27 3D scan at negative 3D.............................................................................................................. 23
Fig. 28 Anti reflection scan ................................................................................................................... 23
Fig. 29 Image of an oil painting ............................................................................................................ 24
Fig. 30 Magnified area of oil painting................................................................................................... 25
Fig. 31 Rotation of magnified area ....................................................................................................... 25
Fig. 32 Parts of WT36ART-EXT1-A ........................................................................................................ 26
Fig. 33 Additional parts of the assembled extension kit ...................................................................... 26

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2. Revision History
Date
Rev.
Name
Description of Change
Reason of Change
29.03.2018
1.0
TI,JCA,ESA
First draft
First published version
3. About this Manual
3.1. Purpose
This manual has been written by Image Access for operators of WideTEK ART scanners. It contains a
description of the functional principles of the scanner family which is helpful in understanding it´s
behavior and the scanning results. The manual also describes the limits of the technology. Many
examples illustrate how to get the best scan of a certain object using the scanner controls.
3.2. Corrections
This manual may contain typographical errors and/or technical inaccuracies due to improvements or
changes in products. When numerous changes have occurred in applicable products or in the content
of this manual over a longer period of time, Image Access will issue a new version of this manual. The
reader should always check www.imageaccess.de for the latest version of this document.
3.3. Warranty
The information contained in this document is subject to change without further notice. Image
Access makes no warranty of any kind regarding this material; including, but not limited to, the
implied warranties of merchantability and fitness for a particular purpose. Image Access shall not be
liable for any errors contained herein or for any incidental or consequential damages in connection
with the furnishing, performance or use of this material.

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3.4. Safety
In this manual, the following safety information can be found:
CAUTION
Notices with the word CAUTION warn about a situation that could lead to minor or more
serious injuries.
The Caution symbol calls attention to an operating procedure, practice, or the like which, if not
correctly performed or adhered to, could lead to minor or more serious injuries. Do not proceed
beyond a Caution symbol until the indicated conditions are fully understood and met.
ATTENTION!
This note warns of situations that can lead to scanner or other property damage. Other
property includes the objects to be scanned.
The Attention symbol calls attention to an operating procedure, practice, or the like, which, if not
correctly performed or adhered to, could result in damage to or destruction of part or all of the
scanner or other property. Do not proceed beyond an Attention symbol until the indicated conditions
are fully understood and met.
BEST PRACTICE
This note gives hints about the best ways to achieve good results. Information in this
note should be understood as an advice, there may be other ways of operating that may
result in similar or even better results.
This symbol indicates the correct way of handling an object or a situation.
This symbol indicates the wrong way of handling an object or a situation.

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4. Concept of the WideTEK 36ART
The unique concept of a WideTEK 36ART is formed around three major elements.
4.1. Scanner Main Body
The WideTEK 36ART’s main body controls a lightweight scanner table which is moved through the
scanner’s body via a set of rubber wheels, placing the camera position at the stable part of the
scanner. In contrast to other designs which consist of a massively immobile scanning bed with a
rather fragile line camera mounted above the scanning bed, the WideTEK 36ART moves the material
to be scanned through the scanner to the camera position. In the conventional designs, the camera
and the lights must move across the scanning bed. This requires a high amount of precision and
many complex physical and mechanical adjustments to ensure the necessary stability to achieve this
precision.
4.2. Scanner Head with Cameras
The WideTEK 36ART cameras are located in the upper part of the scanner body. The three cameras
are side by side and form a scanning line of 22.500 pixels, which allows scanning at 600dpi over the
full depth of the scanner. The head is elevated above the scanning table, effectively creating a
clearance of 100mm (4”). The camera head can be raised by up to 100mm (4”) to accommodate
thicker objects while remaining in focus.
There are two lasers located exactly between the cameras. They are used to measure the distance to
the object and are also used to stich the scans together.
4.3. Scanning Table
Transporting the scanning table through the scanner is done using a runway, which is located directly
in the middle. The runway still needs room to the left and right as other designs do, but is also very
slim and does not overrun a minimum footprint.
The scanning table is moved with limited force. It cannot injure a person or damage objects (unless
they are pushed off the runway). Whenever the scanner is not driving the table, it can be moved
freely by the operator. The benefit of this is that the table can be pulled out of the scanner without
requiring any tools.

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5. Scan Table Position
The scanning table is a unique design and is very different from conventional designs. This makes it
necessary to explain its features and the logic behind the scan table design.
5.1. Rubber Wheel Transport
The scanner moves the table using a set of rubber wheels. The lower set of wheels, the drive wheels,
are driven by two motors, one for the left side and one for the right side . Both of these wheels have
contact to the table in the front and in the back.
To improve friction, there are four pressure wheels holding the table down against the transport
wheels. Occasionally, the pressure needs to be adjusted. The four pressure wheels can be adjusted
by unscrewing the center bolt with the SW4 Allen wrench. The pressure wheels should apply a fair
amount of pressure to insure friction and should not be freewheeling in any position. If you can move
the wheel and it moves the table without freewheeling, the pressure is correct.
5.2. Cleaning the Rubber Wheel Transport
Clean the pressure rollers, the drive wheels and the paper path with a damp cloth. Wet the cloth and
wring it out as much as possible. The best results are obtained with a microfiber cloth.
Use a mild soap and water solution only if necessary. Do not use abrasive cleaners.
ATTENTION!
The pressure wheels can be removed from the scanner. Be careful not to lose the nut
inside the aluminum beam. Before you put the wheels back in place, adjust the position
of the nut with a small tool.
Pressure wheel (above scan table)
Fig. 1 Rubber wheel transport
Drive wheel (below scan table)

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Fig. 2 Never place objects on the runway
Fig. 3 Correct placement of object
ATTENTION!
Never put any objects on the runway. Although the motors are torque limited to avoid
harm to persons, the table will have enough force to push anything (cups, bottles,
phones, tablets and scanning objects) over the edge of the runway.

Best Practices WideTEK 36ART Page 9 of 26
5.3. Insert/Remove Scanning Table without Tools
The scan table for the scanning objects can be inserted and moved on the scanner by hand.
The right side of the scan table must be inserted first. The right side can be identified via the two
additional white lines across the shorter edge of the table.
➢Put the scan table on the runway.
➢When the scan table has been placed on the runway, make sure that it is flush with the right
side of the scanner stand.
➢To check if it is straight, stand in front of the scanner at the right side. Examine the top edge
of the scan table to ensure it runs alongside the right side of the scanner and is flush.
Fig. 4 Insert the scanning table
The only physical connections between the table and the scanner are the transport wheels. They
have four pressure wheels. They move the table with limited friction, which is a security feature. The
four pressure wheels can be adjusted by unscrewing the center bolt with the SW4 Allen wrench. The
pressure wheels should apply a fair amount of pressure to insure friction and should not be
freewheeling in any position.
There is no position or end switch which tells the scanner where the start position is. The start
position is the position the scanner table is in when a scan command is invoked. If the scan table
reaches its end, or if the scan is interrupted, press the START POSITION button to return the table to
the start position.
Right side of table

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5.4. Location and Weight of Objects
The maximum weight you can put on the scanning table is 10Kg or 22lbs. Proper operation of the
scanning table is guaranteed if the weight is spread out to the sides so that the center of the weight
is over the runway, which supports the middle of the table. The runway itself supports up to 30Kg or
66lbs but it is not recommended to place objects this heavy on the table. If the user is very careful,
this can be done if the weight is centered over the runway. The motors are strong enough to pull
even 30Kg but placing objects above 10Kg/22lbs on the table is done at the user’s own risk and any
damage done to the scanner or the scanning material is not the responsibility of the manufacturer.
CAUTION
Maximum table load is 10kg, 22lbs. Always make sure that the total weight is centered
on the table and that the center of the weight is on the runway.
Fig. 5 Correct positioning and weight
Fig. 6 Incorrect positioning and weight
Runway

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Fig. 7 Control panel
6. The Control Panel
The scanner features full user
control of the scan table position,
the scanner’s height and the focus
methods used.
The control panel can be invoked
from the main screen here. As long
as the control panel is active, the
line lasers are switched on and
measurements are performed.
E F G H
6.1. Table Movement Control
The button F moves the table to the left, the button H moves the table to the right. The button E
moves the table back to the previous scanning position. Every time a scan is initiated, this position is
stored as the starting position. The stop button Gstops the table at any time immediately. During
scanning, this button will also end a scan when pressed, eliminating the need to measure the
necessary scan length.

Best Practices WideTEK 36ART Page 12 of 26
Fig. 8 Control panel head
A B C D
6.2. Head Movement Control
The head of the WT36ART can be raised by 100mm (appr. 4”) to accommodate for objects that are
thicker. In the lowest position, clearance is already 100mm which means that objects who´s scanning
surface is at the table level can have a frame or other obstructing parts up to 100mm. When you
drive the head up, that scanning surface and the clearance move up in sync. The indicator A
represents the heights of the head. The black bar at the 100mm line is the lowest position and it can
be raised to 200mm.
The buttons at D move the head up and down. The movement starts slowly but will accelerate if the
button is kept activated. The controls Band Cshow the laser assisted height measurements as well
as the actual position of the head. They are the same with the exception that the Focus Laser Front
represents the first laser from the operator’s view and the Focus Laser Back represents the second
laser from the operator’s view.
The value Focus Laser Back 8,3mm is the distance between the measured
heights (red line) and the current position of the head (bold green line). In
this example, the optimal focal plane is 8,3mm (red line) above the
current position of the head.
The red line represents the result of the laser measurement. Laser
measurement may fail if the head is too low because at some point the
laser becomes invisible. This is the case if an “out of range” message
appears.
The Auto Focus and Fixed Focus buttons will be explained on the
following pages.

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6.3. Auto Focus Control
The Auto Focus function uses a laser assisted distance measurement of the object relative to the
focal plane of the camera, which moves up and down with the head position.
If both lasers detect a distance between the object scanned and the focal plane, the scanner assumes
a straight line between the two points (Fig. 9). The image taken is assumed to be taken from an
object which has a position like the blue bar in the above Fig. 9. The scanner will then correct all
geometric distortions (mainly due to shifting resolution because of the varying distance). This process
is repeated for each scanning line, effectively following any bow or angle of the object.
If only one laser is set to Auto Focus, the distance is only taken from this laser. Since only one
measurement exists, the object is assumed to be perfectly horizontal, illustrated in Fig. 10.
If both lasers are set to Fixed Focus no
geometric correction is done. The object is
assumed to be exactly in the focal plane and
also perfectly horizontal.
This is useful if scanning very irregular objects.
Since no correction is done, the scanner will
behave like an ordinary camera taking an
image from a fixed position.
There is one trade-off to having multiple cameras. Each camera has an angle of view at the outer
edges of its view and the next camera has the same angle of view but from the other side. This may
produce artifacts on very irregular objects if the area of irregularity is in the vicinity of the lasers,
where the cameras join.
Fig. 9 Auto Focus using both lasers
Fig. 11 No Auto Focus used
Fig. 10 Auto Focus using one laser

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6.4. Correct Positioning for Auto Focus
The scanner has two lasers which are located between the three cameras. The laser lines are visible
by both cameras, which allows measuring the heights of the object. These lasers are used by the
Autofocus function. The laser lines also assist in the stitching process. The lasers are on during the
scanning process but also when the control panel is active. The scanning area is marked by the white
corners and a dotted line. Scanning starts at the white dotted line on the right. It is not necessary to
perfectly align the object with the start line, since the scan has to be cropped later anyway.
Place the object to be scanned on the table below the red laser lines. It will be seen by the cameras
and the focal point will be set. Depending on the size of the scanning material, both laser lines should
be fully on the object. If the object is smaller, one laser line should be fully on the object. The other
laser line should be outside of the object. The laser lines should not be partially on an edge of the
object but rather either fully on or fully off the object.
Fig. 12 Correct positioning under laser
Fig. 13 Incorrect positioning under laser

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6.5. Scan Start and Length Control
When the scanner has been powered up and the scanning table is in the start position, the scanner is
ready to scan. The object must be put under the camera and moved close to the white alignment
edges which define the start and the width of the scan. You may also pull out the table for this
operation by hand. Do not forget to push the table back to the start position (Aligned to the right
side of the scanner).
Fig. 14 Default scanning length
6.6. Operator Defined Scanning Length
The preset and automatic scan length is 20”(508mm) from the start line. This can be changed in the
software in increments of 10” (254mm) up to 60”(1.524mm). Set the scanning length to a value
higher than the object’s length and press the start button. The default scanning length is 20”
therefore, if your object is shorter you do not have to do anything. At any time during the scan, you
can press the stop button and end the scan. Typically, this is done after the object has passed the
scanning position, which is clearly visible through the front window located below the touch screen.
6.7. Start Scan
Tap the start button and wait until the scanner stops. Alternatively, you can tap the stop button any
time. At the end, tap the Last Scan Start Position which will move the scanning table back to the start
position. For convenience, you may also exchange the object now and then go back to the start
position.
ATTENTION!
Whenever a new scan is started the scanner assumes the table is at the start position. If
you did not use the Last Scan Start Position the table will advance with every scan until
it disconnects from the wheels.
Default scanning length

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Fig. 15 Quality tab
7. Software Stitching
The laser lines projected on the scanning object are seen by two cameras at any
given time. Each laser line´s actual position is proportional to the distance of the
object relative to its ideal position. The result is shown in the control panel for both
lasers, back and front.
Stitching might appear to be easy because it would only be necessary to put the left
and right image together exactly at the laser line. Unfortunately, the laser line is not
one pixel wide but rather covers five or more pixels. Also, the object itself presents
to the laser a surface with varying reflectivity, diffusion and other properties, making
it hard to exactly detect it´s position precisely for the cameras.
Because a stitching error of more than one pixel is visible to the human viewer, more has to be done
to correct stitching artifacts.
All Image Access scanners which have two or
more cameras feature an Adaptive 2D stitching
function. This function will identify the optimal
crossover point for the stitching process, based
on advanced algorithms. The algorithms are
content based, to determine the x and y offset
which needs to be applied for an optimal result.
If this control is set to Fixed these algorithms are
switched off. The image is stitched together using
the values determined in the factory at the time
of manufacturing or newer values measured by a
technician with the help of the stitching
adjustment glass plate. Using the fixed values only makes sense for diagnostics purposes.
Example: If a scan with fixed stitching at head position zero and using a flat document (like the
stitching adjustment target shipped with the scanner) does not result in an almost perfect stitch (less
than 5 pixels @ 600dpi), a camera adjustment by an authorized service technician may be necessary.
BEST PRACTICE
Adaptive 2D Stitching is the setting of choice. In almost all scenarios it produces very
predictable and the best possible results. Only use Fixed if you fully understand the way
it works.

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8. Various Scanning Scenarios
8.1. Scanning Thin Objects
Thin Object Examples
Examples of thin objects are paper based objects, plastic foils, fabric etc. with a thickness of not more
than 1mm (40mils). All necessary settings can be made in the control panel.
Position
Position the object as described in the previous chapter. If the object is small, it should be located
directly under the front laser only. Although not necessary in most cases, the Focus Laser Back can be
set to Fixed Focus. In this case, the laser information is not used for any corrections.
Focal Plane and Stitching
The focal plane is assumed to be on top of the scan table. The scanner head is at its lowest position
which can be controlled in the Control Panel via the Clearance reading at 100mm. The Focus Laser
Front and Focus Laser Back both read close to 0mm. Both focus lasers should be left at Auto Focus.
Fig. 16 Default setting, Auto Focus on and clearance at 100mm
Scan
The lasers will measure the distance to the object surface while the object is moved through the
scanner. If the distance changes, the software will correct the resolution and stitch all camera images
together at the correct position.

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Fig. 18 Wavy target scanned with Fixed Focus
8.2. Artifacts Scanning Thin Objects
As long as the surface of the object in the vicinity of the lasers is smooth, there will be no artifacts. If
another object is laying on top of the object to be scanned and caught by a laser set to Auto Focus,
the laser will assume that the surface is closer and will correct the resolution causing a distortion.
Thicker Object under Laser
Fig. 17 Artifact caused by an object under the laser
Wavy Objects
The White Reference Target had been laid on the scanner bed in waves. This is to illustrate the
difference between fixed and auto focus. In Fixed Focus the waves are visible and the marks on the
edges of the scanning area are straight because no focus and geometric adjustment is done. In Auto
Focus the geometric adjustment is performed which straightens out the target but leaves the edge
markers at an angle.
Size distortion caused by
distance change from coin
No distortion
Laser
Fig. 19 Wavy target scanned with Auto Focus

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8.3. Scanning Thick Objects
Thick Object Examples
Examples of thick objects are fine art on canvas, plastic foils, hardwoods, tiles, etc. All necessary
settings can be made in the control panel.
Position
Position the object as described in the previous chapter. If the object is small, it should be located
directly under the front laser only. If the thick object is only seen by the front laser, the back laser
should be set to Fixed Focus. In this case, the laser information is not used for any corrections.
Focal Plane and Stitching
The focal plane is indicated by the two horizontal green bars. If the object is large enough, both
lasers are on Auto Focus and will measure the distance to the object. If the object is very uneven in
height between the lasers, try to make both distances close as in the following example.
Fig. 20 Control panel showing thick object
BEST PRACTICE
Always make sure you understand where the laser measurement takes place. Since the
scanner focal position of the head can only be at one position, make sure it is the
optimal position with the least deviations between the two measurements.

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8.4. Artifacts Scanning Thick Objects
Fine art on canvas should be scanned without the frame. If there is enough clearance, it can be
scanned with the frame but you will see artifacts on the frame due to the Auto Focus. When the
lasers hit the frame, they measure a shorter distance to the frame and will therefore correct the size
distortion so that the width of the image is slightly reduced to scale it back to 300 or 600dpi. As soon
as the laser hits the canvas, it measures a slightly greater distance and does not scale anymore. This
is correct for the canvas but the frame on the left and right are closer to the camera and are left
untouched. This results in a slightly wider frame at a more spread out position.
If the canvas is not bowed too much, you can try scanning framed art with Fixed Focus. This will not
produce artifacts caused by the frame.
Fig. 21 Fine art scan with frame
BEST PRACTICE
Whenever possible scan fine art without a frame. There are many benefits, one of them
is, that you can print it out and put it in the same frame without missing any content due
to shadows, incorrect cropping and other imperfections.