OpenCV Q&A Forum - RSS feedhttp://answers.opencv.org/questions/OpenCV answersenCopyright <a href="http://www.opencv.org">OpenCV foundation</a>, 2012-2018.Mon, 04 Dec 2017 08:38:14 -0600python facedetection detectMultiScalehttp://answers.opencv.org/question/179696/python-facedetection-detectmultiscale/The function `cv2.detectMultiScale` can successfully detect the position of face and by using the fuction `cv2.detectMultiScale3` i can also know the confidence score of each detected face.
My question is the fuction `cv2.detectMultiScale3` only tells confidence scores of the search windows of detected faces,and my thought is when i slowly move the search window,it can tell me the socres for every window(even if they are very small) but not only the detected faces window.
in this program i simply cut 1 image to several parts(using the `cv2.ROI`)
import os
import cv2
from PIL import Image,ImageDraw
image_save_path_head = "H:/OpenCV-demo-master/FaceDetection_python-opencv/cut-pic"
image_save_path_tail = ".jpg"
for i in range(1,49):
img = cv2.imread( "%s%d%s" % (image_save_path_head, i, image_save_path_tail) )
face_cascade = cv2.CascadeClassifier("H:/opencv/sources/data/haarcascades/haarcascade_frontalface_default.xml")
if img.ndim == 3:
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
else:
gray = img
faces = face_cascade.detectMultiScale3(gray,flags=1, scaleFactor=1.1, outputRejectLevels=True)
rects = faces[0]
neighbours = faces[1]
weights = faces[2]
print("weight of %d is "%(i),rects,neighbours,weights)
and i get
> weight of 1 is () () () weight of 2
> is () () () weight of 3 is () () ()
> weight of 4 is () () () weight of 5
> is () () () weight of 6 is () () ()
> weight of 7 is () () () weight of 8
> is () () () weight of 9 is () () ()
> weight of 10 is () () () weight of 11
> is () () () weight of 12 is () () ()
> weight of 13 is () () () weight of 14
> is () () () weight of 15 is () () ()
> weight of 16 is () () () weight of 17
> is () () () weight of 18 is () () ()
> weight of 19 is () () () weight of 20
> is () () () weight of 21 is () () ()
> weight of 22 is () () () weight of 23
> is () () () weight of 24 is () () ()
> weight of 25 is () () () weight of 26
> is () () () weight of 27 is () () ()
> weight of 28 is () () () weight of 29
> is () () () weight of 30 is () () ()
> weight of 31 is () () () weight of 32
> is () () () weight of 33 is () () ()
> weight of 34 is () () () weight of 35
> is () () () weight of 36 is () () ()
> weight of 37 is () () () weight of 38
> is () () () weight of 39 is () () ()
> weight of 40 is () () () weight of 41
> is () () () weight of 42 is () () ()
> weight of 43 is () () () weight of 44
> is () () () weight of 45 is () () ()
> weight of 46 is [[ 4 10 37 37]]
> [[25]] [[ 7.2749402]] weight of 47 is
> () () () weight of 48 is [[ 0 13 32
> 32]] [[25]] [[ 8.64948004]]jyunMon, 04 Dec 2017 08:38:14 -0600http://answers.opencv.org/question/179696/