The article is dedicated to to the review of the methodology of automated detection of hidden video cameras based on the analysis of polarization and nonlinear optical effects. The limitations of the approaches used, such as retroreflective and thermal imaging methods, are considered, especially in the conditions of miniaturization and removal of active components of cameras outside the controlled area. The expediency of using phase shift, change in the state of polarization and second harmonic generation as unmasking signs of the presence of optical systems is substantiated. The concept of forming probing radiation with specified parameters and analyzing deviations of the reflected signal for subsequent automatic detection of hidden lenses is proposed. The advantages of the method are discussed, including independence from the visual perception of the operator, the possibility of working in the infrared range and integration into fully automated technical control systems. The results of the work are of interest for ensuring the security of confidential information.