In version 2.4, the cropping and alignment tools have been improved
and reorganized. The new user interface clearly separates the functions
of cropping and aligning stereo images. A basic "Cropping and Alignment"
mode allows you to quickly set the vertical alignment, horizontal alignment
(stereo window), and to crop regions of stereo images. An "Advanced
Cropping" mode provides two types of cropping operations. The first
cropping operation can be used to exclude undesirable parts of an image
while the second cropping operation can be used to select the parts of
an image to include in the stereo view. These cropping features allow
the alignment and the selected parts of the images to be changed while
preventing the undesirable parts of an image from creeping into the view.
Another new feature allows you to fix the aspect ratio of the view
to any value.
Cropping and Alignment Mode
In the "Cropping and Alignment" mode, the alignment functions allow
you to set the vertical alignment of the stereo images and the horizontal
alignment (position of the stereo window). Two crosses appear
on each image surrounded by a local magnified portion of the image.
The alignment is selected by dragging these points to sharp features in
the images. One point on each image is used for the vertical alignment
and one point on each image is used for the horizontal alignment.
The magnified regions around the points allow you to position the points
accurately on sharp features. If you always want to used the maximum
allowed view, you only need to select the alignment of the images and can
avoid using the cropping operations altogether.
screenshot Cropping and Alignment
Advanced Cropping Mode
In the "Advanced Cropping" mode, the first cropping operation can be
used crop out borders around the images or defective portions of the images.
If your images have no undesirable regions, you don't need to use the first
The second cropping operation allows you to set the desired size of
the view and the aspect ratio of the view. You can move the selected
view to any position inside the first cropping borders. If you always
want to use the maximum allowed view, you don't need to use this cropping
screenshot Advanced Cropping
Toolbar and Keyboard Control
All cropping and alignment variables can be adjusted while viewing
the image in any stereo format except the first cropping operation which
crops out the undesirable portions of the image. For that operation,
you need to be in the "Advanced Cropping" mode. The cropping and
alignment variables can be changed by using the tools labeled "X" and "Y"
on the toolbar or by using the arrow keys. The current active variables
can be selected by using a selection control on the toolbar or by pressing
the "Tab" key. The selections are:
screenshot Adjusting the stereo window
"Scroll" -- used for scrolling the images
"Crop" -- used for setting the cropped size of the images
"Position" -- used for setting the position of the selected portions of
"Align" -- used for setting the vertical alignment and stereo window.
Note: Pressing the "Shift" key in combination with the above
tools or arrow keys increases the increment of change in a variable by
a factor of 10.