ARKit面部识别----51个面部特征

ARKit中包含的ARFace可以用于面部表情识别，共采集51个面部信息特征，存放在ARFaceAnchor.BlendShapeLocation类中。

需要注意，面部识别最低iOS系统版本为iOS 11.0，但iOS 11.0只有50个信息点位，iOS 12.0 增加了一个舌头的点位：

Left Eye

static let eyeBlinkLeft: ARFaceAnchor.BlendShapeLocation

The coefficient describing closure of the eyelids over the left eye.描述左眼上眼睑闭合的系数。

 static let eyeLookDownLeft: ARFaceAnchor.BlendShapeLocation

The coefficient describing movement of the left eyelids consistent with a downward gaze.描述与向下凝视一致的左眼睑运动的系数。

static let eyeLookInLeft: ARFaceAnchor.BlendShapeLocation
The coefficient describing movement of the left eyelids consistent with a rightward gaze.
static let eyeLookOutLeft: ARFaceAnchor.BlendShapeLocation
The coefficient describing movement of the left eyelids consistent with a leftward gaze.
static let eyeLookUpLeft: ARFaceAnchor.BlendShapeLocation
The coefficient describing movement of the left eyelids consistent with an upward gaze.
static let eyeSquintLeft: ARFaceAnchor.BlendShapeLocation
The coefficient describing contraction of the face around the left eye.
static let eyeWideLeft: ARFaceAnchor.BlendShapeLocation
The coefficient describing a widening of the eyelids around the left eye.
Right Eye
static let eyeBlinkRight: ARFaceAnchor.BlendShapeLocation
The coefficient describing closure of the eyelids over the right eye.
static let eyeLookDownRight: ARFaceAnchor.BlendShapeLocation
The coefficient describing movement of the right eyelids consistent with a downward gaze.
static let eyeLookInRight: ARFaceAnchor.BlendShapeLocation
The coefficient describing movement of the right eyelids consistent with a leftward gaze.
static let eyeLookOutRight: ARFaceAnchor.BlendShapeLocation
The coefficient describing movement of the right eyelids consistent with a rightward gaze.
static let eyeLookUpRight: ARFaceAnchor.BlendShapeLocation
The coefficient describing movement of the right eyelids consistent with an upward gaze.
static let eyeSquintRight: ARFaceAnchor.BlendShapeLocation
The coefficient describing contraction of the face around the right eye.
static let eyeWideRight: ARFaceAnchor.BlendShapeLocation
The coefficient describing a widening of the eyelids around the right eye.
Mouth and Jaw
static let jawForward: ARFaceAnchor.BlendShapeLocation
The coefficient describing forward movement of the lower jaw.
static let jawLeft: ARFaceAnchor.BlendShapeLocation
The coefficient describing leftward movement of the lower jaw.
static let jawRight: ARFaceAnchor.BlendShapeLocation
The coefficient describing rightward movement of the lower jaw.
static let jawOpen: ARFaceAnchor.BlendShapeLocation
The coefficient describing an opening of the lower jaw.
static let mouthClose: ARFaceAnchor.BlendShapeLocation
The coefficient describing closure of the lips independent of jaw position.
static let mouthFunnel: ARFaceAnchor.BlendShapeLocation
The coefficient describing contraction of both lips into an open shape.
static let mouthPucker: ARFaceAnchor.BlendShapeLocation
The coefficient describing contraction and compression of both closed lips.
static let mouthLeft: ARFaceAnchor.BlendShapeLocation
The coefficient describing leftward movement of both lips together.
static let mouthRight: ARFaceAnchor.BlendShapeLocation
The coefficient describing rightward movement of both lips together.
static let mouthSmileLeft: ARFaceAnchor.BlendShapeLocation
The coefficient describing upward movement of the left corner of the mouth.
static let mouthSmileRight: ARFaceAnchor.BlendShapeLocation
The coefficient describing upward movement of the right corner of the mouth.
static let mouthFrownLeft: ARFaceAnchor.BlendShapeLocation
The coefficient describing downward movement of the left corner of the mouth.
static let mouthFrownRight: ARFaceAnchor.BlendShapeLocation
The coefficient describing downward movement of the right corner of the mouth.
static let mouthDimpleLeft: ARFaceAnchor.BlendShapeLocation
The coefficient describing backward movement of the left corner of the mouth.
static let mouthDimpleRight: ARFaceAnchor.BlendShapeLocation
The coefficient describing backward movement of the right corner of the mouth.
static let mouthStretchLeft: ARFaceAnchor.BlendShapeLocation
The coefficient describing leftward movement of the left corner of the mouth.
static let mouthStretchRight: ARFaceAnchor.BlendShapeLocation
The coefficient describing rightward movement of the left corner of the mouth.
static let mouthRollLower: ARFaceAnchor.BlendShapeLocation
The coefficient describing movement of the lower lip toward the inside of the mouth.
static let mouthRollUpper: ARFaceAnchor.BlendShapeLocation
The coefficient describing movement of the upper lip toward the inside of the mouth.
static let mouthShrugLower: ARFaceAnchor.BlendShapeLocation
The coefficient describing outward movement of the lower lip.
static let mouthShrugUpper: ARFaceAnchor.BlendShapeLocation
The coefficient describing outward movement of the upper lip.
static let mouthPressLeft: ARFaceAnchor.BlendShapeLocation
The coefficient describing upward compression of the lower lip on the left side.
static let mouthPressRight: ARFaceAnchor.BlendShapeLocation
The coefficient describing upward compression of the lower lip on the right side.
static let mouthLowerDownLeft: ARFaceAnchor.BlendShapeLocation
The coefficient describing downward movement of the lower lip on the left side.
static let mouthLowerDownRight: ARFaceAnchor.BlendShapeLocation
The coefficient describing downward movement of the lower lip on the right side.
static let mouthUpperUpLeft: ARFaceAnchor.BlendShapeLocation
The coefficient describing upward movement of the upper lip on the left side.
static let mouthUpperUpRight: ARFaceAnchor.BlendShapeLocation
The coefficient describing upward movement of the upper lip on the right side.
Eyebrows, Cheeks, and Nose
static let browDownLeft: ARFaceAnchor.BlendShapeLocation
The coefficient describing downward movement of the outer portion of the left eyebrow.
static let browDownRight: ARFaceAnchor.BlendShapeLocation
The coefficient describing downward movement of the outer portion of the right eyebrow.
static let browInnerUp: ARFaceAnchor.BlendShapeLocation
The coefficient describing upward movement of the inner portion of both eyebrows.
static let browOuterUpLeft: ARFaceAnchor.BlendShapeLocation
The coefficient describing upward movement of the outer portion of the left eyebrow.
static let browOuterUpRight: ARFaceAnchor.BlendShapeLocation
The coefficient describing upward movement of the outer portion of the right eyebrow.
static let cheekPuff: ARFaceAnchor.BlendShapeLocation
The coefficient describing outward movement of both cheeks.
static let cheekSquintLeft: ARFaceAnchor.BlendShapeLocation
The coefficient describing upward movement of the cheek around and below the left eye.
static let cheekSquintRight: ARFaceAnchor.BlendShapeLocation
The coefficient describing upward movement of the cheek around and below the right eye.
static let noseSneerLeft: ARFaceAnchor.BlendShapeLocation
The coefficient describing a raising of the left side of the nose around the nostril.
static let noseSneerRight: ARFaceAnchor.BlendShapeLocation
The coefficient describing a raising of the right side of the nose around the nostril.
Tongue
static let tongueOut: ARFaceAnchor.BlendShapeLocation
The coefficient describing extension of the tongue.