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en:processing:найти_структурный_элемент [2012/02/14 18:51] Анна Протопопова |
en:processing:найти_структурный_элемент [2012/02/15 13:09] Анна Протопопова |
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| {{en:processing:find_structure_element_3_en.jpg|Calling a function from the menu}} {{en:processing:find_structure_element_4_en.jpg|The parameters window}} | {{en:processing:find_structure_element_3_en.jpg|Calling a function from the menu}} {{en:processing:find_structure_element_4_en.jpg|The parameters window}} | ||
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| + | The size of the area in which maximums are searched may coincide with the size of structure element image used for correlation, in this case the value of **Locality** parameter mast be set to **Structure element**. It is reasonable if you have selected one or few unit cells for cross correlation. If you have isolated an area consisting of several unit cells, then select ** Neighborhood ** and specify the size of the neighborhood in nanometers. | ||
| + | After selecting the two options described above, some of the centers of elementary cells may be identified twice by mistake: | ||
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| + | {{:processing:find_structure_element_2_en.jpg|Incorrect identification of the centers of elementary cells}} | ||
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| + | In this case set the value ** Yes ** to the parameter ** Dilate intermediate results ** to merge closely located maximums. The radius of merging is defined by **Radius, nm** parameter. | ||
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| + | A groupe **Accumulator** integreate the parameters of resulting image size. One can set for the final image the same //XY// sizes as initial image has, in this case the new filtered full image will be formed. One can also form up a picture with a part of initial image only, for example an image of one unit cell. | ||
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| + | === Examples === | ||
| + | In general, this feature provides a very powerful tool to improve the images of periodic structures with molecular and atomic resolution. But it requires fine-tuning of the parameters, and if you do not get the desirable result with your images, see the section [[en:howto: structure_element | Examples]], where details on the parameter values used in different situations will be given . | ||