Toward Artifact-Free Dermoscopy: Characterization of ISIC 2019 Image Defects for Deep Learning Applications
The International Skin Imaging Collaboration (ISIC) archive offers the largest publicly available collection of dermoscopic images for skin lesion analysis. However, the ISIC 2019 dataset suffers from several acquisition artifacts such as hair occlusions, vignetting, surgical ink markings, and ruler scales, all of which compromise its utility in deep learning workflows by introducing non-biological visual structures. To address these limitations, we present a rigorously annotated version of ISIC 2019 that includes binary masks for key artifact types. Ink marks and vignetting were annotated through systematic manual review and iterative refinement using professional image editing software. For hair and ruler artifacts, we implemented a semi-automatic pipeline based on our previously developed deep learning architecture, ChimeraNet. Automated predictions were then manually corrected as needed for precision. The resulting dataset supports both the development of our own melanoma detection model and broader community research requiring artifact-mitigated dermoscopic images.