dlib's face landmark detection

http://dlib.net/face_landmark_detection.py.html

运行起来问题不大，最后每个面孔会返回68个点，这68个点分别是：

0, 17 => 下巴
17,22 => 左眉毛
22,27 => 右眉毛
27,31 => 鼻梁
31,36 => 鼻子
36,42 => 左眼，顺时针
42,48 => 右眼，顺时针
48,68 => 嘴巴，顺时针

code:

class FaceLandMark:
    def __init__(self, points, h, w):
        self.ps = points
    def left_eye_center(self):
        idxs = (37,38,40,41)
        x = sum(map(lambda u: self.ps[u][0], idxs)) * 0.25
        y = sum(map(lambda u: self.ps[u][1], idxs)) * 0.25
        return (x, y)
    def right_eye_center(self):
        idxs = (43, 44, 46, 47)
        x = sum(map(lambda u: self.ps[u][0], idxs)) * 0.25
        y = sum(map(lambda u: self.ps[u][1], idxs)) * 0.25
        return (x, y)

def xy_off(xy, off = 10):
    (x, y) = xy
    return (x + off, y + off)

def write_points(src, dst, ps):
    im = Image.open(src)
    draw = ImageDraw.Draw(im)
    draw.line(ps, fill = 'white')
    im.save(dst)

def write_circle(xys,src, dst, radius = 10):
    im = Image.open(src)
    draw = ImageDraw.Draw(im)
    for xy in xys:
        draw.ellipse([xy_off(xy, -radius), xy_off(xy, radius)], fill = 'white')
    im.save(dst)

人脸检测与自动磨皮

基于 GPUImage 的实时美颜滤镜原理解析

code:

def skin_retouch(im, v1 = 3, v2 = 1, p = 50):
    dx = v1 * 5
    fc = v1 * 12.5
    raw = np.asarray(im).astype(np.float32)
    temp1 = cv2.bilateralFilter(raw, dx, fc, fc)
    temp2 = temp1 - raw + 128
    temp3 = cv2.GaussianBlur(temp2, (2 * v1 - 1, 2 * v1 - 1,), 0, 0)
    temp4 = raw + 2 * temp3 - 255
    dst = (raw * (100 - p) + temp4 * p) * 0.01
    return Image.fromarray(dst.astype(np.uint8))