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en:processing:найти_структурный_элемент [2012/02/15 13:09] Анна Протопопова |
en:processing:найти_структурный_элемент [2012/03/14 15:19] 127.0.0.1 external edit |
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| === The order of work === | === The order of work === | ||
| - | Open an image of an ordered structure you want to process. First of all select the fragment with minimal noise and artifacts on which one or several unit cells are presented, [[en:processing:создать_копию|duplicate]] this fragment. Return to the initial image, it must be active when you call the function. Call **Find structure element** from [[en:processing:меню_математика|Mathematics menu]] -> Correlation. | + | Open an image of an ordered structure you want to process. First of all select the fragment with minimal noise and artifacts on which one or several unit cells are presented, [[создать_копию|duplicate]] this fragment. Return to the initial image, it must be active when you call the function. Call **Find structure element** from [[меню_математика|Mathematics menu]] -> Correlation. |
| Select the copied element in the appeared window. Two more windows will appear - parameters window and a window with the resulting image. | Select the copied element in the appeared window. Two more windows will appear - parameters window and a window with the resulting image. | ||
| - | The function detaches structure elements by determination of local maximums of [[en:processing:взаимная_корреляция|cross correlation]] between two images. The points of the maximums are marked with red dots on the initial image and our intention here is to achieve the correct determination of all the maximums by adjusting the parameters of the function. The rigidity in maximums picking may be different, it is defined by **Level** parameter. this parameter varies between 0 and 1, 0 corresponds to the most strict picking of maximums and often gives a good result. Normally the best result may be achieved with small values of this parameter. Select a string with the **Level** parameter and find the optimal value by clicking arrows near it. | + | The function detaches structure elements by determination of local maximums of [[взаимная_корреляция|cross correlation]] between two images. The points of the maximums are marked with red dots on the initial image and our intention here is to achieve the correct determination of all the maximums by adjusting the parameters of the function. The rigidity in maximums picking may be different, it is defined by **Level** parameter. this parameter varies between 0 and 1, 0 corresponds to the most strict picking of maximums and often gives a good result. Normally the best result may be achieved with small values of this parameter. Select a string with the **Level** parameter and find the optimal value by clicking arrows near it. |
| {{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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| === Examples === | === 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 . | + | 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 [[..:howto: structure_element | Examples]], where details on the parameter values used in different situations will be given . |