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When an EBSD pattern has weak Kikuchi bands, commercial software using the Hough transform, like TSL, has difficulties identifying the band bands and hence cannot index the pattern. Instead of detecting the bands, EMsoft with its dictionary indexing simulates patterns and compare compares these to the experimental patterns. Dictionary indexing is much more robust towards noise than Hough indexing, and in most cases where there is some band information in the pattern is able to index the pattern. An example of this: https://www.nature.com/articles/s41598-018-29315-8
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See the recently published, highly pedagogical, hands-on tutorial on how to do this: https://link.springer.com/article/10.1007%2Fs40192-019-00137-4.
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