This tutorial example illustrates the steps of running the Align process of i2k Retina. It skips over some of the details explained in the initial montage example. After loading both color fundus and fluoresein angiogram images, and then selecting a subset of them, the display looks like
In the upper right, Montage is still selected from the drop-on menu; it is the default. By selecting Align, clicking on the Process tab, and then exposing the Options, the display becomes.
Now instead of the Blend option of the Montage process, there is an Aligned Images Crop Option, with three choices. These all refer what to do with the images after the images are registered and transformed into a common coordinate system. If the default None setting is chosen, then no cropping is applied. If Intersection is chosen, then the resulting images are cropped to the intersection of their fundus areas. This results in the least “jumpiness” of the resulting images, but if there is a lot of movement between images, then a lot of pixels are eliminated! The Target image is covered in a separate tutorial example.
With the default selection, the user can click on Process to launch i2k Retina. The same registration computation is applied, but the images are not combined to form a montage. Instead they are mapped into a common coordinate system. The resulting images are saved to a separate file and shown in i2k Viewer
The default display in i2k Viewer is the Aligned mode, as seen in the second tab along the bottom of the window. In Aligned mode, the images are played in sequence, with controls along the bottom to start and stop the sequence and control the speed and size of the display. A plus symbol on the top-right corner of each image thumbnail can be used to disable or enable the image in the animation sequence. Other tutorials illustrate more aspects of i2k Viewer.