Synthetic-to-Real Dataset for Industrial Quality Control of Sheet Metal Parts (Holes and Slots)

This dataset accompanies the research on mobile-based industrial quality control using LiDAR and YOLO segmentation. It includes both real annotated images of sheet-metal coupons and synthetic photorealistic renderings generated from CAD models. The dataset is designed to support training and evaluation of instance segmentation and measurement pipelines for industrial inspection tasks. Contents Real Images: High-resolution photographs of sheet-metal coupons with holes and slots. Manually annotated polygon masks for features (holes, slots). Synthetic Images: 243 images generated with BlenderProc from CAD models created in CadQuery. Photorealistic rendering with PBR metal textures, HDRI lighting, and varied cluttered/clean backgrounds. Pixel-level segmentation masks aligned with CAD geometry. See file example.png in the dataset for an illustration of annotations. Annotations The dataset contains 3 object classes: part → the entire workpiece outline (blue in the example figure) slot → rectangular/rounded slots (orange) hole → circular features (green) Each image has an associated annotation file (.txt) in YOLO polygon format. Each row in the .txt file corresponds to one object instance (part, slot, or hole). The structure of each row is: <class_id> <x1> <y1> <x2> <y2> ... <xn> <yn> <class_id> → integer index of the object class (0=part, 1=slot, 2=hole) <xi> <yi> → normalized polygon vertex coordinates (range [0,1] relative to image width/height) Polygons can have variable length depending on the number of vertices At least 4 points are used to represent each shape (more for complex boundaries) Usage The dataset can be used for: Training and validating instance segmentation models (YOLO etc.). Synthetic-to-real domain adaptation studies. Dimensional measurement and defect detection in industrial QA research. Limitations The current real dataset is small (10 images, with annotations), intended as an anchor for synthetic-to-real transfer. Synthetic images are based on flat sheet-metal coupons with holes and slots; more complex geometries are planned for future releases.