processing:backgrounddac
Differences
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| processing:backgrounddac [2019/09/04 18:40] – created smerkel | processing:backgrounddac [2026/08/10 10:49] (current) – smerkel | ||
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| One necessary step of the data processing is the subtraction of the background. One way to do it is to create an average or a median image of the whole file series and then subtract each single image by this average/ | One necessary step of the data processing is the subtraction of the background. One way to do it is to create an average or a median image of the whole file series and then subtract each single image by this average/ | ||
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| + | See the following page for instructions : [[backgroundgeneral|Background evaluation and subtraction]] | ||
| ===== Subtract average or median? ===== | ===== Subtract average or median? ===== | ||
| - | Creating an average image can be done with '' | ||
| The median image is less affected by outliers than the average. Therefore, if you have strong diamond peaks in some of the images, you will probably still see them also on the average image while there are none in the median one. Because of that, for subtracting the background the median image should be preferred. However, for other purposes you might still need the average image. | The median image is less affected by outliers than the average. Therefore, if you have strong diamond peaks in some of the images, you will probably still see them also on the average image while there are none in the median one. Because of that, for subtracting the background the median image should be preferred. However, for other purposes you might still need the average image. | ||
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| ===== When to subtract the background? ===== | ===== When to subtract the background? ===== | ||
processing/backgrounddac.txt · Last modified: by smerkel