Analysis of Mini-Camera's Cat-Eye Retro-Reflection for Characterization of Diffraction Rings and Arrayed Spots by Chun Liu, Changming Zhao, Haiyang Zhang, Zilong Zhang, Shuyuan Gao, Yunshi Wang

“…An analysis of the detection conditions and the reflection image features described in this article can thus be applied to hidden camera detection. Mini-cameras can be detected according to these features of the received beam profiles.…”
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