Abstract
This book aims to give an analysis and assessment through the extraction of metric information from historical images and to experiment with its potentialities in the heritage field with the aim of valorising historical iconographical documentation. This documentation has been produced for many other purposes but actually contains something very valuable for Cultural Heritage: data and information. Specifically, the work explores how to extract and use dimensional data from historical images for documenting monuments, buildings and groups of buildings that no longer exist or were transformed over time.