Apparatus and method with image recognition-based security

An apparatus, comprising:

• one or more processors configured to:
• determine between a locked state and an unlocked state of a terminal;
• and
• when a result of the determination between the locked state and the unlocked state of the terminal is that the terminal is in the unlocked state:
• track, in a current frame, a face detected in a previous frame;
• detect for a background region change between the previous frame and the current frame based on a background region, of the current frame, distinguished from a region of the tracked face in the current frame;
• when a result of the detection for the background region change is that the background region change is not detected, determine whether a state maintenance time of the unlocked state fails to meet an unlocked state maintenance preset time, where the state maintenance time of the unlocked state is a time for which the unlocked state of the terminal has been maintained for one or more previous frames;
• and
• in response to the state maintenance time of the unlocked state failing to meet the unlocked state maintenance preset time,
• determine an operation mode to be a first operation mode for determining whether recognition succeeds for the current frame,
• perform the first operation mode, including performance of face detection with respect to the current frame, and
• maintain the unlocked state of the terminal for the current frame when the face is detected as a result of the performance of the face detection, representing that the recognition succeeded for the current frame.

An apparatus, comprising:

• one or more processors configured to:
• perform a first operation mode which includes a face detection with respect to a current frame;
• perform another operation mode which includes the face detection and at least one of facial recognition and unauthorized object detection with respect to the current frame, where the first operation mode is performed without performing the facial recognition and without performing the unauthorized object detection;
• determine between a locked state and an unlocked state of a terminal for the current frame;
• when a result of the determination between the locked state and the unlocked state of the terminal is that the terminal is in the unlocked state, perform one operation mode selected between the first operation mode and the other operation mode for determining whether recognition of a user succeeds for the current frame;
• and
• when a result of the determination between the locked state and the unlocked state of the terminal is that the terminal is in the locked state dependent on a previous frame, determine one or more reasons why the terminal is in the locked state dependent on the previous frame and selectively maintain the terminal in the locked state dependent on the determined one or more reasons, for the determining of whether the recognition succeeds for the current frame.