Unauthorized person detection device and unauthorized person detection method

A masquerading detection device which, for use in determining whether a target is a specified person or not, detects the target being a non-specified person who masquerades as said specified person, comprising:

• target information obtaining means having two target image obtaining means which photograph a target to obtain target image data representing the target, image storage means which stores said target image data, and
• data processing means having masquerading determination means which determines whether said target is said non-specified person or not, wherein
• said masquerading determination means generates a distance image of a target by using a visual difference between said two target image obtaining means to determine whether a known face region in said distance image has a plane configuration or not and determines that the target is a non-specified person when the region has a plane configuration.

A masquerading detection method, for use in determining whether a target is a specified person or not, of detecting the target being a non-specified person who masquerades as said specified person, comprising the steps of:

• irradiating said target with light transmitted by a filter on which a predetermined pattern is drawn to project said pattern onto the target,
• photographing the target on which the predetermined pattern is projected to obtain target image data indicative of the target, and
• comparing a pattern appearing in a face region of a target image represented by said target image data and said predetermined pattern to determine whether said target has a plane configuration or not and when the target has a plane configuration, determining that the target is a non-specified person.

A masquerading detection method, for use in determining whether a target is a specified person or not, of detecting the target being a non-specified person who masquerades as said specified person, comprising the steps of:

• executing measurement processing of measuring a distance between target image obtaining means for use in photographing a target and said target, and
• executing masquerading determination processing of determining whether said target is said non-specified person or not, wherein
• said masquerading determination processing includes processing of comparing a distance measured by said measurement processing and a predetermined appropriate distance between said target image obtaining means and a specified person to determine whether the distance between said target image obtaining means and said target is within the appropriate range and determining that the target is a non-specified person when the distance is out of the appropriate range.

A masquerading detection method, for use in determining whether a target is a specified person or not, of detecting the target being a non-specified person who masquerades as said specified person, comprising the steps of:

• executing sensing processing of sensing a target locating at a distance shorter than an appropriate distance between target image obtaining means which is used for photographing a target and a specified person, and
• executing masquerading determination processing of determining whether said target is said non-specified person or not, wherein
• said masquerading determination processing includes processing of determining whether a target is sensed by said sensing processing or not and when sensed, determining that the target is a non-specified person.

A masquerading detection method, for use in determining whether a target is a specified person or not, of detecting the target being a non-specified person who masquerades as said specified person, comprising the steps of:

• executing target image obtaining processing of photographing a target from two different directions to obtain two target image data indicative of the target, and
• executing masquerading determination processing of determining whether said target is said non-specified person or not, wherein
• said masquerading determination processing includes processing of generating a distance image of a target by using a visual difference between two target image obtaining means which execute said target image obtaining processing, determining whether a face region in said distance image has a plane configuration or not and determining that the target is a non-specified person when the region has a plane configuration.