This book constitutes the thoroughly refereed post-conference proceedings of the 12th International Workshop on Graphics Recognition, GREC 2017, held in Kyoto, Japan, in November 2017.
The 10 revised full papers presented were carefully reviewed and selected from 14 initial submissions.

Automated Analysis of Phase Diagrams.- An Approach for Detecting Circular Callouts in Architectural, Engineering and Constructional Drawing Documents.- A System for Automatic Elevation Datum Detection and Hyperlinking of AEC Drawing Documents.- Multimodal classification of document embedded images.- Searching for a Compressed Polyline with a Minimum Number of Vertices.- Pen-based Music Document Transcription with Convolutional Neural Networks.- Optical Music Recognition by Long Short-Term Memory Networks.- Extracting information from molecular pathway diagrams.- Extraction of ancient map contents using trees of connected components.- Extracting the February 1956 Ground Level Enhancement Event From Legacy Cosmic Ray Recordings.- Engineering Drawing Challenge II.- Discussion Group Summary: Optical Music Recognition.- Discussion Group Summary: Graphics Syntax in the Deep Learning Age.- Two Decades of GREC Workshop Series. Conclusions of GREC2017.

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