About Datasets Variables

[aylinSyntonym]

What is center_w and center_h which use in Alignment process in evaluation?

[ZhenglinZhou]

Hi @aylinSyntonym, thanks for your interest!

The center_w and center_h is the centric point of the face box. More details can be found here.

In my exp, to calculate these params of your own image, the following code could be considered:

import dlib

detector = dlib.get_frontal_face_detector()
sp = dlib.shape_predictor(predictor_path)

dets = detector(input_image, 1)
num_faces = len(dets)
results = []
for detection in dets:
    face = sp(input_image, detection)
    shape = []
    for i in range(68):
        x = face.part(i).x
        y = face.part(i).y
        shape.append((x, y))
    shape = np.array(shape)
    x1, x2 = shape[:, 0].min(), shape[:, 0].max()
    y1, y2 = shape[:, 1].min(), shape[:, 1].max()
    scale = min(x2 - x1, y2 - y1) / 200 * 1.05
    center_w = (x2 + x1) / 2
    center_h = (y2 + y1) / 2