A new search query for searching
spectra on registered libraries
in the software can be created or an existing search query can be edited
here. Some parameters must be adjusted in order to receive optimal search
results for the particular search request.
A preview of the spectrum to be searched is shown in a little 2D view.
Selected regions of the spectrum will be considered for searching. They
are highlighted by a light-green background.
Normalize each search range
This flag enables (the value must be set to true) or disables (the
value must be set to false) normalization for defined spectral regions.
The intensities of the query spectrum and
the library spectrum will be normalized between 0 and 1 before both spectra
are compared. Normalization will be applied to the intensities of the
spectral region only, and each spectral region will be normalized independently.
Comparing
algorithm
Algorithms for comparison of spectral data are widely described in
the literature and are still under heavy discussion. It strongly depends
on the data type and the pre processing of data, which comparing algorithm
is useful and yields the best results.
Some of the most feasible comparing algorithms are included into the
software.
For details about comparing algorithms, please
refer to the Search Algorithm
section.
Search
ranges
Spectrum comparison can be reduced to some exclusive spectral regions.
Click on the New
Range button to add a spectral region for searching. Obsolete regions
can be deleted by clicking the Delete
Range button.
This feature is useful, if the user is only
interested in one or more particular regions of a spectrum containing
meaningful information.
Speed up searching!
Selection of regions will reduce the number
of compared data points drastically. This will increase the search speed.
Minimum quality
The result of a spectrum comparison is a matching quality value between
0 and 100. 0 means, there is no correlation between query spectrum and library spectrum
and 100 means perfect a match. Finally a search result table is returned
containing all library spectra with a quality better than the minimum
quality value.
The
quality value can be adjusted by the user to reduce the number of search
results in the table to meaningful library spectra of an expected quality.
A list of all registered libraries in the software is displayed here.
The user must select those libraries, that will be applied for spectrum
comparison.
Tip: If you do not exactly know, if
a library contains relevant spectra, select all libraries first and then
refine your search query in a second run.
Besides the matching quality value, the
search result table might contain additional information about resulting
library spectra. Additional information is carried in object properties
or object labels, that have been
previously uploaded together with library spectra.
The user can configure the labels and properties
here, being displayed in columns of the search result table. These additional
information will be retrieved together with the search results and can
be reviewed by the user.
Tip: If you do not exactly know, if
a library contains relevant spectra, select all libraries first and then
refine your search query in a second run.
