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In this paper, we introduce a digital 2-dimensional (2D) photogrammetry method that utilizes a graphics viewer program to obtain a real metric linear length value from an image in which a marker of a known size is embedded. Farkas et al. [1] compared facial measurements obtained from life-size printed photographs with direct measurements and reported reliable results for 20 of the 62 measurements. Nechala et al. [2] placed a ruler beside a subject in a photograph to obtain a reproduction ratio for digital 2D photogrammetry. Those methods are difficult to use to assess the results of various types of craniofacial surgery. Moreover, although 3-dimensional (3D) anthropometric equipment is currently available, it has limited applicability in office settings [3-6]. Many physicians still use direct anthropometry or life-size printed photos [7-9]. Mulliken and Sullivan [10] discussed the importance of including some type of calibration in the images used for photogrammetry, and Price et al. [11] used the subjects’ corneal diameter for calibration. However, those authors did not include an assessment of the spherical aberration of the lens in their studies, although this is an important factor in photoJeong Woo Lee, Dong Kyu Kim, Seung Gyun Chu, Byung Chae Cho, Kyung Young Lee

Digital 2-Dimensional Photogrammetry Simplified by Using a Marker of a Known Size