Our work aims to interpret historical documents in closed booklet form without physical unfolding through CT scanning techniques. X-ray based CT scans can transform booklets into physical data for analysis, and current research in this direction performs page segmentation at the two-dimensional level and does not analyze data from historical documents at the three-dimensional level. Our proposed method uses a self-developed web tool for 3D dimensional annotation and solves Laplace’s equation to construct the 3D spatial structure of historical documents and perform page segmentation. We experiment with data in booklet form and show how to segment and extract pages in three dimensions by using Laplace’s equation.