Class: AVMetadataFaceObject
- Inherits:
-
AVMetadataObject
- Object
- NSObject
- AVMetadataObject
- AVMetadataFaceObject
Overview
The AVMetadataFaceObject class is a concrete subclass of AVMetadataObject that defines the features of a single detected face. You can retrieve instances of this class from the output of an AVCaptureMetadataOutput object on devices that support face detection.
Instance Attribute Summary (collapse)
-
- faceID
readonly
The unique ID for this face metadata object.
-
- hasRollAngle
readonly
A Boolean value indicating whether there is a valid roll angle associated with the face.
-
- hasYawAngle
readonly
A Boolean value indicating whether there is a valid yaw angle associated with the face.
-
- rollAngle
readonly
The roll angle of the face specified in degrees.
-
- yawAngle
readonly
The yaw angle of the face specified in degrees.
Attributes inherited from AVMetadataObject
#bounds, #duration, #time, #type
Method Summary
Methods inherited from NSObject
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Constructor Details
This class inherits a constructor from NSObject
Dynamic Method Handling
This class handles dynamic methods through the method_missing method in the class NSObject
Instance Attribute Details
- (Integer) faceID (readonly)
The unique ID for this face metadata object. (read-only) Each time a face enters the picture, it is assigned a new unique identifier, which you can use to reference the face in your code. Face IDs are not reused, and the same face leaving and entering the picture again is assigned a new identifier.
- (Boolean) hasRollAngle (readonly)
A Boolean value indicating whether there is a valid roll angle associated with the face. (read-only) If the value of this property is NO, the value in the rollAngle property is invalid and must not be accessed.
- (Boolean) hasYawAngle (readonly)
A Boolean value indicating whether there is a valid yaw angle associated with the face. (read-only) If the value of this property is NO, the value in the yawAngle property is invalid and must not be accessed.
- (Float) rollAngle (readonly)
The roll angle of the face specified in degrees. (read-only) The roll angle represents the side-to-side tilt of the face relative to the metadata’s bounding rectangle. A value of 0.0 yields a face that is level relative to the picture, whereas a value of 90 yields a face that is perpendicular relative to the picture.You must check the value of the hasRollAngle property before accessing this property. If the value in the hasRollAngle property is NO, reading the value in this property raises an exception.
- (Float) yawAngle (readonly)
The yaw angle of the face specified in degrees. (read-only) The yaw angle represents the rotation of the face around the vertical axis. A value of 0.0 yields a face that is looking directly at the camera, whereas a yaw angle of 90 degrees yields a face whose eye line is perpendicular to that of the camera.You must check the value of the hasYawAngle property before accessing this property. If the value in the hasYawAngle property is NO, reading the value in this property raises an exception.