FIGURE 1.

Search strategy for publications included in this systematic review for image-based food-recognition systems. In this review, 159 titles were identified when the query (food AND image AND (classification OR recognition OR segmentation OR (dietary AND assessment))) was formed in the PubMed and Scopus databases or from other sources that the reviewers had identified in the past. After removing 14 duplicates, 145 studies were screened by title and 49 were removed, since they were irrelevant to the subject of this study. Thus, 96 studies were assessed for eligibility by full-text reading. Eighteen studies were excluded because they were out of scope or they did not present the performance of the image-based food recognition system presented. Finally, 78 studies were included for full-text review.