Bruise dating using deep learning

Jhonatan Tirado, David Mauricio

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


The bruise dating can have important medicolegal implications in family violence and violence against women cases. However, studies show that the medical specialist has 50% accuracy in classifying a bruise by age, mainly due to the variability of the images and the color of the bruise. This research proposes a model, based on deep convolutional neural networks, for bruise dating using only images, by age ranges, ranging from 0–2 days to 17–30 days, and images of healthy skin. A 2140 experimental bruise photograph dataset was constructed, for which a data capture protocol and a preprocessing procedure are proposed. Similarly, 20 classification models were trained with the Inception V3, Resnet50, MobileNet, and MnasNet architectures, where combinations of learning transfer, cross-validation, and data augmentation were used. Numerical experiments show that classification models based on MnasNet have better results, reaching 97.00% precision and sensitivity, and 99.50% specificity, exceeding 40% precision reported in the literature. Also, it was observed that the precision of the model decreases with the age of the bruise.

Original languageEnglish
Pages (from-to)336-346
Number of pages11
JournalJournal of Forensic Sciences
Issue number1
StatePublished - Jan 2021
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2020 The Authors. Journal of Forensic Sciences published by Wiley Periodicals LLC on behalf of American Academy of Forensic Sciences


  • MasNet
  • bruise dating
  • convolutional neural network
  • deep learning


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