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At line 55 of the original LineExtractor.cpp, if the IF STATEMENT expression here is FALSE, after skipping the IF STATEMENT, the INDEX in the following "_keylines.resize(index + 1);" statement is the length of _KEYLINES, At this time, if it is resized to INDEX+1 (that is, "length plus one"), the attribute in the added data will be a random value, which will lead to the following "lbd->compute(image, _keylines, descriptors); "statement (Calculate the descriptor of the feature line segment) Infinite loop or error!

At line 55 of the original LineExtractor.cpp, if the IF STATEMENT expression here is FALSE, after skipping the IF STATEMENT, the INDEX in the following "_keylines.resize(index + 1);" statement is the length of _KEYLINES, At this time, if it is resized to INDEX+1 (that is, "length plus one"), the attribute in the added data will be a random value, which will lead to the following "lbd->compute(image, _keylines, descriptors); "statement (Calculate the descriptor of the feature line segment) Infinite loop or error!
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