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Learning to Ground Before Reading: Unified PCB Engineering Drawing Parsing with Compact Vision-Language Models

arXiv · AI, language, vision and robotics · article · Aug 29, 2026 · UTC

PCB engineering drawings mix sparse graphics, dense tables, and text whose meaning depends on page position. Localizing the regions and sending crops to specialized recognizers are determined as the methods for most parsers, so missed regions cannot be recovered downstream. We train a compact VLM to read the full page and get a sequence of region classes, normalized boxes, and text or HTML content. Bounding boxes are converted to coordinate tokens for supervision. Inference uses no detector or crop parser. The joint target is difficult to optimize because class and box tokens are sparse relati

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