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A shape recovery problem of book surface using two shade images under the fully perspective environments is discussed. In order to simplify the problem, the whole recovery process is divided into three sequential and explicit steps: preprocessing, apparent shape recovery, and generation of ortho-image. The separation of albedo and shading with reduced effect of interreflections is done in preprocessing step by applying image processing and a phenomena-based model. Implicit equations governing the shading and observation have been transformed into explicit ones having minimized number of unknown parameter. A direct and unique recovery become possible by combining the transformed ones and the recurrence relation. A feed-back recovery process is implemented as a practical algorithm which overcomes self-shadows. The results of simulations and real experiments show the properness and acceptability of the proposed approach and the implemented algorithms.

Shape Recovery of Book Surface Using Two Shade Images Under Perspective Condition