We describe and discuss a new method which records only information concerning an object's dimensions in black and white photographs. Since the differences in grey values that derive from the object's colors are eliminated, these photographs are then used to produce true relief illustrations for the blind with detail and precision, rapidly and inexpensively.
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References
1.
ClausC. J., KrohnI. T., and SwantonP. C. (1961). A Photopolymerization method of preparing three-dimensional terrain models.Phot. Sci. Eng.5, 211–215.
