在CV2中,我可以从上传的图像生成面部。
faces = faceCascade.detectMultiScale(
read_img,
scaleFactor = 1.1,
minNeighbors = 0,
minSize=(100,100)
)
how_many_faces = len(faces)
how_many_faces返回正确的面数。
如果我将这些面附加到数组中......
our_faces = []
for i in faces:
our_faces.append(i)
return str(our_faces)
...并返回our_faces,我得到以下数据:
[array([187,138,236,236],dtype = int32),array([197,138,236,236],dtype = int32),array([163,130,260,260],dtype = int32 ),array([163,141,260,260],dtype = int32),array([173,141,260,260],dtype = int32),array([184,141,260,260],dtype = int32),array([143,119,286,286],dtype = int32),array([167,119,286,286],dtype = int32),array([143,131,286,286],dtype = int32),array([155,131,286,286],dtype = int32),array([167,131,286,286],dtype = int32),array([144,105,315,315], dtype = int32),array([157,105,315,315],dtype = int32),array([131,118,315,315],dtype = int32),array([144,118,315,315] ,dtype = int32),array([157,118,315,315],dtype = int32),array([170,118,315,315],dtype = int32),array([130,87,346,346] ],dtype = int32),array([115,101,346,346],dtype = int32),array([130,101,346,346],dtype = int32),array([144,101,346, 346],dtype = int32),数组([159,101,346,346],dtype = int32),数组([130,115,346,346],dtype = int32),数组([87,70,419] ,419],dtype = i NT32)]
我是否正确地假设这个数组包含每个面的所有数据,并且它是一个Numpy数组?如果是这样,我如何将数组中的数据转换回图像格式?
faceCascade.detectMultiScale()
返回一个矩形列表,因此它不包含检测到的面部的图像,并且您无法完全从该列表重建面部。
如果你想获得面部图像,你需要:
faces
返回的faceCascade.detectMultiScale()
列表中的矩形def crop(image, faces, k=0):
"""
This function crops the initial image into faces' images seperately.
Arguments:
image (np array image)
faces (list of tuples)
"""
faces_arrays = []
for (top, right, bottom, left)in faces:
x0, y0 = left, bottom
x1, y1 = right, top
w, h = right-left, top-bottom
cv2.rectangle(img=image, pt1=(x0, y0), pt2=(x1, y1), color=(255,0,0), thickness=2)
x2, x3 = x1-w, x0+w
# crop the region of interest over a copy
face = image[y1:y0, x2:x3].copy()
faces_arrays.append(face)
# comment the two following lines if you want to stop saving the crops
cv2.imwrite('face'+str(k)+'.jpg', face)
k += 1
return faces_arrays