A geometric technique based on wedge-shaped constraints is described to detect physical inconsistencies of reflection in an image. Specifically, we discuss the reflection vanishing point, and propose to employ wedge-shaped constraints to expose image forgery. A set of linear inequalities are proposed to constrain the location of the reflection vanishing point. A feasible solution indicates the truth of the image, while a failure to find a solution provide evidence of photo tampering. The experimental results indicate that the proposed method can detect image forgery with very high success rates and it is extremely robust to compression, filtering, and other image processing operations.
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