PMC:7782580 / 31445-31632 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T241","span":{"begin":38,"end":137},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"ed the identification of the details. PCA has been widely used for feature extraction and dimensionality reduction in image processing49. We used PCA to determine the feature space of the"}