Subgraph spotting in graph representations of comic book images.

•Problem of lack of freely available ground-truthed datasets for subgraph spotting.•New SSGCI dataset for subgraph spotting in graph representations of comic book images.•Description of groundtruth of the new SSGCI dataset and evaluation protocol.•Results of two state-of-the-art methods of subgraph spotting on the new SSGCI dataset.•Foster and facilitate research for developing new subgraph spotting techniques and use of structural information for CBIR and QBE.