Sequence alignment filtering processing method, system and device, and readable storage medium

A filter processing system for a sequence alignment, comprising:

• an absolute location searching module configured to search for absolute locations of all seeds of a to-be-aligned sequence in a reference sequence;
• an absolute location segmentation module configured to perform segmentation on the absolute locations of all the seeds in the reference sequence, to obtain relative locations of all the seeds;
• a mapping relationship establishing module configured to divide the reference sequence into a plurality of reference sub-sequences in advance, and establish a mapping relationship between a relative location of each seed and a reference sub-sequence corresponding to the seed;
• an occurrence number counting module configured to determine a reference sub-sequence to which each seed belongs according to a feature identifier of the seed and the mapping relationship, and count the numbers of occurrences of the seeds in each reference sub-sequence;
• a sub-sequence filtering module configured to filter out a reference sub-sequence that does not meet a preset condition based on the numbers of occurrences of the seeds in each reference sub-sequence, to obtain a target reference sub-sequence meeting the preset condition;
• and
• a CAL recovering module configured to recover a real CAL based on a difference between a relative location and an absolute location of each seed in the target reference sub-sequence.