Representing medical images with encoded local projections

Hamid R. Tizhoosh, Morteza Babaie

Research output: Contribution to journalArticlepeer-review


This paper introduces the 'encoded local projections' (ELP) as a new dense-sampling image descriptor for search and classification problems. The gradient changes of multiple projections in local windows of gray-level images are encoded to build a histogram that captures spatial projection patterns. Using projections is a conventional technique in both medical imaging and computer vision. Furthermore, powerful dense-sampling methods, such as local binary patterns and the histogram of oriented gradients, are widely used for image classification and recognition. Inspired by many achievements of such existing descriptors, we explore the design of a new class of histogram-based descriptors with particular applications in medical imaging. We experiment with three public datasets (IRMA, Kimia Path24, and CT Emphysema) to comparatively evaluate the performance of ELP histograms. In light of the tremendous success of deep architectures, we also compare the results with deep features generated by pretrained networks. The results are quite encouraging as the ELP descriptor can surpass both conventional and deep descriptors in performance in several experimental settings.

Original languageEnglish (US)
Article number8253476
Pages (from-to)2267-2277
Number of pages11
JournalIEEE Transactions on Biomedical Engineering
Issue number10
StatePublished - Oct 2018


  • Deep features
  • LBP
  • histopathology images
  • image classification
  • image retrieval
  • medical image retrieval
  • projections
  • radon transform

ASJC Scopus subject areas

  • Biomedical Engineering


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