Karin Lau Photography

Stereoscopic Images

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Humans see in three dimensions, in other words, we have depth perception, because our eyes provide overlapping fields of view from slightly different vantage points. The amount of depth perception in humans is limited to about 400 m distance, however, because of the relatively close spacing of our eyes, i.e., only 6-7 cm apart (Drury, 1987). Stereoscopic photography has been practiced since the

middle 19th century to provide 3-D imagery (Osterman, 2007; Fig. 2-8). Aerial stereo photographs may be taken from widely separated positions (Fig. 2-9). Such overlapping pictures typically are viewed through a stereoscope in order to produce exaggerated depth perception (Fig. 2-10). Vertical stereophotos are important for visual photointerpretation and are the basis for many photogrammetric techniques (Ogleby, 2007).

FIGURE 2-8 Antique stereoscopic viewer and stereophotos of Yosemite Valley, California, United States. These devices were popular in the late 19th and early 20th centuries.