Celestron NexImage Solar System Imager User Guide - Page 23

Stacking Screen

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Stacking Screen The stacking phase aims at increasing the signal to noise ratio in the final images. When you have used Align & Stack on the Align Page you will automatically pass through the stacking page and advance directly to the Image Processing page. You can however return to this page from the processing page. 1 2 3 1. Stackgraph (dropdown panel) • Quality-cutoff: This slider sets the lower-edge of the image quality used during stacking. In the graph above the slider a red line represents the (ordered) quality of the different images that are used. You can select all the images (move the slider to the right) or only a few if the quality drops after a certain point. On the screen above the quality cutoff line intersects the image quality curve at the 91% mark. This eliminates all the images to the right on the cutoff line. The effect of the sliders on the total number of images to be stacked is shown in the lower part of the screen (text). Be aware that selecting images in the dotted-line section is not recommended. These images were not optimized and still can show unwanted shifts. • Difference-cutoff: Next to image-quality, the difference between an image and the reference image can also be useful in selecting images. If you see a few high spikes in an otherwise more or less equal field, it's logical to cut those images out of the final stack. Just lower the slider (and the corresponding blue line) until the peaks are above the line. 22

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Stacking Screen
The stacking phase aims at increasing the signal to noise ratio in the final images. When you
have used Align & Stack on the Align Page you will automatically pass through the stacking
page and advance directly to the Image Processing page. You can however return to this
page from the processing page.
1. Stackgraph (dropdown panel)
•
Quality-cutoff:
This slider sets the lower-edge of the image quality used during
stacking. In the graph above the slider a red line represents the (ordered) quality of
the different images that are used. You can select all the images (move the slider to the
right) or only a few if the quality drops after a certain point. On the screen above the
quality cutoff line intersects the image quality curve at the 91% mark. This eliminates all
the images to the right on the cutoff line. The effect of the sliders on the total number of
images to be stacked is shown in the lower part of the screen (text). Be aware that
selecting images in the dotted-line section is not recommended. These images were
not optimized and still can show unwanted shifts.
•
Difference-cutoff:
Next to image-quality, the difference between an image and the
reference image can also be useful in selecting images. If you see a few high spikes
in an otherwise more or less equal field, it's logical to cut those images out of the final stack.
Just lower the slider (and the corresponding blue line) until the peaks are above the line.
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