Getting and Reading Holograms with Hidden Image

Setups for recording security holograms with hidden image are considered. These holograms are used as means for control the authenticity of the protected objects. Modifications of the recording setup with application of the code mask in the object beam channel are proposed which make possible to ease the precision requirements for the hologram positioning in the readout setup without degradation of the hidden image protection. As the additional protection measure for the system of the automatic readout of the hologram authenticity, it is proposed to use the preselected elements of the hidden image to store the check code.