What type of passport feature is "ghost image of bearer" considered?

The "ghost image of bearer" is considered a visual security feature because it serves as a visible security element that helps verify the identity of the passport holder. This feature typically appears as a semi-transparent image of the passport holder integrated into the passport’s data page. Its presence enhances the document's authenticity and helps confirm that it has not been altered or counterfeited.

Visual security features are designed to be easily recognizable and discernible either by the naked eye or with the use of simple tools, making them important in the initial inspection process for border control officers. These features, including holograms, patterns, and ghost images, work together to protect the integrity of the passport and deter fraudulent activities.