Manual calibration adjustment

Calibration usually produces good results. However, some calibration parameters can also be corrected manually.

Start by moving the locator onto the image or video objects in order to make a suitable image for alignment appear on the screen.
To open the dialog box for calibration adjustment click main menu item Multidisplay and select VIOSO Calibration...
In the VIOSO dialog, click button Properties on the left, following which the dialog for calibration adjustment will appear.
In the large field the alignment grid allows the projected image to be correctly placed on the screen. Please note that the changes on the screen are only visible in Presentation Mode, i.e. you need to hit the F5 key. The following options are available for the adjustment:

In addition to the images in the timeline also other images can be used for alignment. At Show you can load any image or activate the test image, Black or the warping grid so that it can be displayed on the projection screen.
Dragging the round corners changes the size proportionally, dragging while holding the Ctrl key down moves the point.

Note: When a handle is highlighted it is also displayed on the screen on the Warp grid. If the warp grid is not to be displayed during alignment you can disable this option. See Screens Properties.

Dragging the square handles shifts all the points of the corresponding border line.
By clicking the round handles at the border they are provided with additional Bezier handles which allow direction and degree of warping to be changed. This allows barrel or pillow shaped distortions caused by camera lens distortions to be eliminated.
Dragging in the picture moves the image as a whole
Dragging outside the picture rotates it.

If the camera cannot be set up perpendicular to the screen the center of the image will not be right in the center of the projection surface. This is how you can align the center of an image...

Undo last edit ...to undo the last editing steps; various steps are available

Scale mode ...drag the round corner points or intersection points to change the size proportionally. Drag the square handles to shift all the grid points of the corresponding border or grid line. Dragging the picture off the intersection points moves the image as a whole.

Deform mode ...by dragging the round corner or intersection points only the area down to the next grid line is changed. Dragging one of the square handles moves the corresponding line in parallel. Dragging the picture off the intersection points moves the image as a whole. Dragging outside the image rotates it.

Holding the Ctrl key while clicking the intersection points allows you to highlight several of them one after the other. These intersection points can then be moved together although this would only make sense for the round intersection points.
Increase or reduce the view in size by turning the mouse wheel while holding the Alt key. This allows for more accurate and easier editing. The visible section can be shifted with the mouse while holding the Alt key.
Right-click the grid to select further functions such as Zoom or Pan. Reset View resumes the default view.

Toggle borders ...displays the rectangular handles for adjusting the border lines.

Toggle tangents ...displays the Bezier handles of highlighted, round grid intersection points.

Coarse shift ...of a highlighted intersection point by pressing the cursor key.

Fine shift ...of a highlighted intersection point by pressing a cursor key.

Double columns ...increases the number of grid columns to double the amount (vertical lines).

Reduce columns ...reduces the number of grid columns to half the amount (vertical lines).

Double grid lines ...increases the grid lines to double the amount (horizontal lines).

Reduce grid lines ...reduces the number of grid lines to half the amount (horizontal lines).

Linear interpolation ...the grid lines remain straight during shifting.

Bicubic interpolation ...results in shifting bent grid lines, e.g. in a distortion of the image. If a round handle is highlighted, they are provided with additional Bezier handles which allow direction and degree of warping to be changed. This allows barrel or pillow shaped distortions caused by camera lens distortions to be eliminated.

Load snapshot ...opens a list of available snapshots that can be activated by highlighting them.

Use coordinates ...applies manually entered coordinates (in the fields below) to the highlighted intersection point.

Undock camera window (top right corner) ...opens the camera image with the tool bar as a separate window which can be maximized.

If the camera cannot be set up perpendicular to the screen the center of the image will not be right in the center of the projection surface. Add a vertical grid line by clicking if it is not yet visible. Highlight the central intersection point and move the image center until it is right in the middle of the projection surface.

The buttons on the left offer the following functions:

Color & Blending ...opens the dialog for color correction and softedge blending. Further information on the dialog...

Projector ...opens the dialog for brightness and color correction for the individual projectors. Moreover, the projector image can also be masked. See also The Vioso Mask Editor.
Mapping ...allows further adjustment for dome mapping.