Alignment Page
Here you are presented with many different controls that are discussed in detail
in the User's Guide. For this tutorial we will only discuss the most important
features. On this screen you should see two smaller windows that are on top of
the RegiStax Aligning window. One of them is the FFT-spectrum and the other is
called Registration properties. They are displayed using the two checkboxes
under the Options box. Both of these panels are useful when aligning images.
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FFT-spectrum. This filter is used to estimate the alignment shift between the
reference frame and the rest of the frames in the sequence. Your initial image
should show a multi-colored square with a red circular area in the middle.
The red area in the middle represents where the program estimates the best
alignment. The FFT-spectrum is used to calculate the similarity between
images and estimates the best shift when aligning the images. Increase the
value of the Alignment filter to 12 and press the Recalc FFT button. Notice
that the red-area becomes smaller and the blue line in the Registration
properties graph changes position. Ideally only a small group of pixels
in the image should become red. This part of the image is used to register
(align) the images more accurately.
The next step is to weed out the blurred frames from your video sequence. The
Quality Filter Band shows the distribution of large and small details on each
frame. Images that show a high number of small features are a good indication
that the image is sharp.
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