3-Dimensional facial expression recognition in human using multi-points warping.

BMC Bioinformatics · 2019 · PMC6889223 · PMID 31791234

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fairly significantno p-value reported

Moreover, asides unidentifiable lighting challenges, the fairly significant differences in age, skin colour and appearance of individual placed additional burden on machine learning.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.