Surveillance assist device

A surveillance assist device comprising:

• processing circuitry
• to calculate a last-time position representing a portion showing a stationary object in a last-time image obtained by a camera before swing control of causing the camera which photographs the stationary object to change a photographing range, and a this-time position representing a portion showing the stationary object in a this-time image obtained by the camera after the swing control;
• to determine whether the this-time image is a false image based on a quantity of change in the photographing range resulting from the swing control and a quantity of change in the this-time position from the last-time position;
• to exclude a swing pattern selected from a plurality of swing patterns last time, and to select a swing pattern randomly from among remaining swing patterns;
• and
• to perform the swing control according to the selected swing pattern.

A surveillance assist device comprising:

• processing circuitry
• to calculate a last-time position representing a portion showing a stationary object in a last-time image obtained by a camera before swing control of causing the camera which photographs the stationary object to change a photographing range, and a this-time position representing a portion showing the stationary object in a this-time image obtained by the camera after the swing control;
• to determine whether the this-time image is a false image based on a quantity of change in the photographing range resulting from the swing control and a quantity of change in the this-time position from the last-time position;
• to determine a swing period with which the swing control is performed, based on a current clock time;
• and
• to perform the swing control according to the swing period.