PMC:7782580 / 31483-31582 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T241","span":{"begin":0,"end":99},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"PCA has been widely used for feature extraction and dimensionality reduction in image processing49."}