Digital Projection Lightning 38 Sx+ 3d User Manual

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5.3 FUSION calibrator – Calibration View
When all FUSION processing system units are added to the project in the Device View, 
switch FUSION Calibrator to “Calibration View”. This is done by clicking the “Calibration 
View” button in the top-left corner. Clicking the same button in Calibration View mode will 
bring you back to Device View. See Figure 5-10.
Figure 5-10.  Switching views from Calibrator view to Device view and back.
5.3.1 Using the Calibration View Toolbar (CVT)
Like in Device View, Calibration View has its own toolbar on the left hand side of the screen. 
This is called the Calibration View Toolbar, CVT. The toolbar can be shown with or without 
help texts, Figure 5-11. To enable the help texts, click the question mark.
Figure 5-11.  Calibration toolbar, without and with help texts.    
						

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22FUSION - Getting to know the GUI
5.3.2 Selecting/deselecting FUSION processing units
The FUSION Navigator is a window used to select multi image processing system units in a 
project, Figure 5-12. In this window, FUSION units can be selected or deselected either by 
clicking on them or using the assigned short cut key combination.
Figure 5-12.  FUSION Navigator
Similar selection capabilities can be found in the top toolbar, Figure 5-13. In this toolbar 
automatic arrangement of open windows can also be done. 
Figure 5-13.  Top toolbar window navigation   
						

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5.3.3 Using the Calibration Panel Toolbar (CPT)
The calibration panel has a set of tools on the left hand side of the wi\
ndow. This toolbar can 
be shown with or without help texts, Figure 5-14. Calibration Panel Toolbar, without and with 
help texts.
Figure 5-14.  Calibration Panel Toolbar, without and with help texts.    
						

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24FUSION - Getting to know the GUI
The Calibration Panel Toolbar has these main functions:
•	Zoom. Scale the work area in the calibration panel.
•	Image Orientation. Change the orientation of the calibration panel to ma\
tch the physical orientation of the projector. 
•	Set Colors. Set the color for background, lines, control points and internal test patterns, see Figure 5-15.
Figure 5-15.  Set colors control box
•	Layers. Calibration layers for warping, blending, test patterns and other can be turned on and off for easier setup.
•	Hide Inactive. Hide inactive controls. Only active points will be visible on the FUSION output display.
•	Active Guide Points. When using Mesh Bezier Warp or Bezier lines in clipping (masking) or black level management feature, the Bezier functionality (control points) can be turned off. The Selected line will have a linear behaviour.
•	Show Point Setup. Show Control Point Setup when a control point is selected. Location specifies the x and y position of the current control point. In Bezier Guide Point Configura-tion the control point can be configured to be symmetric, corner or smooth. 
 - Symmetric. Corresponding guide points will have identical strength and angle. 
 - Corners. Guide points will be independent in both strength and angle. 
 - Smooth. Corresponding guide points will have identical angle.
Figure 5-16.  Control point setup
•	Show info labels. Show extra info for selected control point.   
						

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•	Bezier Fixed Length/Angle. Specify the bezier guide point behaviour. Off allow adjust-ment of both length and angle. Fixed length allows the user to change an\
gle, but not the length. Fixed 1/3 length will fix the length to 1/3 when the control point is moved. Fixed angle allow the user to change the length while the angle is fixed.
Figure 5-17.  Bezier point settings
•	Straighten Line. Can be used to straighten selected Bezier lines (short\
 cut key: Ctrl + L).
•	Control Point. Up, down, left and right arrows. Use to move between control points or move a control panel one or 1/10 of a pixel.
5.4 FUSION processing operational states
FUSION processing system can operate in 4 different states: Bypass, Calibration, Online or 
Auto. Switch between the different states using the action toolbar.
5.4.1 Bypass states
The DVI input signal is bypassed through the system and passed to the DVI output.
5.4.2 Calibration state
Calibration mode is used to configure the system. Different test patterns will be shown 
depending on what type of calibration is being performed (warp, blend, \
masking etc.). The 
FUSION processing system unit will automatically enter calibration state upon cli\
cking on any 
of the calibration tools in the actions toolbar.
5.4.3 Online state
In online state the DVI input signal is processed according to the calibration and sent to the 
DVI output.
5.4.4 Auto state
When a calibration is completed and the accepted calibration is stored in the FUSION 
processing system unit auto state will be used upon power up of the unit. \
If the multi image 
processing system find a stored calibration that matches the input resolution, it will enter 
online state (image processing enabled). If no calibration is found, the unit will be in bypa\
ss 
state.    
						

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6 Geometry correction
Image Geometry Correction (often referred to as Image Warping) is the process of digitally 
manipulating image data so that the image’s projection precisely matches a specific 
projection surface or shape. Image Geometry Correction compensates for the distortion 
created by off-axis projection or screen placement or non-flat screen surfaces by applying a 
compensating inverse distortion to the image in the digital domain. Usua\
lly, Image Geometry 
Correction is applied so that areas of the projection surface are perceived by the viewer to 
map to the corresponding areas in the source image.
6.1 Warping algorithms
The FUSION processing system supports 3 different warping algorithms: Perspective, Mesh 
Warp Transform, Mesh Warp Bezier. The best way to understand how they work is to test the 
different algorithms in an actual system setup. One projector and one multi image processing 
system unit is enough to learn how they work.
Note! Image Geometry Correction is not applied until operational mode is chan\
ged to 
“online”, which enable you to see the result.
6.1.1 Perspective
This is advanced keystone. Only the four corners of the image can be manipulated.
6.1.2 Mesh Warp Transform
This is recommended for use on simple, slightly curved screens. The number of control 
points can be dynamically added. Start off with a few control points and increase the grid 
size as needed. When the grid is increased, the position of any added point in the finer grid 
mask will be given a correct position automatically. Maximum grid size is 16 x16.
6.1.3 Mesh Warp Bezier
This is a very powerful tool where you can manipulate not only the control points of the grid, 
but also the tangent vectors connected to every control point. The control points of the 
tangent vectors are called Bezier control points. 
Bezier patch meshes are superior to meshes of triangles as a representation of smooth 
surfaces, since they are much more compact, easier to manipulate, and have much better 
continuity properties. In addition, other common parametric surfaces such as spheres and 
cylinders can be well approximated by relatively small numbers of cubic Bezier patches.
Maximum grid size is 16 x16, but the flexibility of this algorithm usu\
ally allows for correct 
geometric distortion with very few control points.     
						

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28FUSION – Geometry correction
6.2 Warping user interface
To apply warping to an image, select “Warp” from the left hand toolbar. The window in Figure 
6-1 will appear.
 
Figure 6-1.  Warping algorithm setup
Algorithms can be added or removed. If the perspective transform is added first, Mesh Warp 
Transform can be used in addition. If Mesh Warp Transform or Mesh Warp Bezier is added 
first, a combination of algorithms is not allowed.
In this window, grid size is also configured. For the control points of an algorithm to be 
visible, the grid size must be at least 1x1.
Increasing grid size during calibration is very convenient. This enable for \
rough calibration 
with few control points, and fine tuning with increased grid size as needed.
Decreasing grid size during calibration is not recommended as you may lose fine tuning data 
you have already added to the grid.   
						

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6.3 Scaling filters
Regardless of the warping algorithms selected, a scaling filter will be app\
lied. Scaling filters 
are configured using the Algorithm Setup window. Select the tab “Filter”, Figure 6-2, and 
select your desired filter. Four different scaling filters are supported: 
•	Lanczos, B-spline, C-spline, Linear
Figure 6-2.  Scaling filters
6.3.1 Lanczos filter
The Lanczos filter is using a 4x4 kernel. This filter is recommended for use with images that 
contains large amounts of fine detail, for example text with small fon\
ts. On thin, diagonal or 
curved lines, some ripple may be encountered.
6.3.2 B-spline filter
The B-spline filter available in the FUSION processing system is of the type Cubic B-spline. 
This filter is slightly softer than the Lanczos filter, but has better quality on curved and straight 
lines. In many cases, this filer will give the best image quality and \
is therefore the default 
selection.
6.3.3 C-spline filter
The C-spline filter is short for Cubic Hermite spline interpolation. I\
t is a filter of third-degree 
spline with each polynomial of the spline in Hermite form (Named in the\
 honour of Charles 
Hermite). This filter gives a good combination of smoothness, detail \
and average ripple on 
lines.
6.3.4 Linear interpolation filter
This filter is also a polynomial filter, but is based on linear interpolation for curve fitting. 
In modern systems, it will give an unnecessarily low quality image scaling, but \
some 
applications may still require the use of this filter.    
						

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30FUSION – Geometry correction
6.4 Working with the perspective algorithm
To start working with the perspective algorithm, click the “Warp” icon, add the perspective 
algorithm and set grid size to 1x1. To map the geometry to the surface being projected on by 
dragging the control points with the mouse. Figure 6-3 shows basic usage of the Perspective 
algorithm.
Figure 6-3.  Working with the perspective transform