我有树莓皮3与树莓杰西安装。opencv3和python3.0也已安装。我得到了一个检测人脸的python示例代码。我需要在屏幕上写一些文字,但它不是写在上面的。我需要写一次文字,而不是在每个面上重复。下面是代码
import cv2
import sys
from tkinter import *
from tkinter import messagebox
faceCascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')
video_capture = cv2.VideoCapture(0)
video_capture.set(3,500)
video_capture.set(4,300)
video_capture.set(12, 0.1)
frameWidth = int(video_capture.get(cv2.CAP_PROP_FRAME_WIDTH))
frameHeight = int(video_capture.get(cv2.CAP_PROP_FRAME_HEIGHT))
while True:
# Capture frame-by-frame
ret, frame = video_capture.read()
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
faces = faceCascade.detectMultiScale(
gray,
scaleFactor=1.1,
minNeighbors=5,
minSize=(30, 30),
flags=cv2.CASCADE_SCALE_IMAGE
)
# Draw a rectangle around the faces
for (x, y, w, h) in faces:
cv2.rectangle(frame, (x, y), (x+w, y+h), (0, 255, 0), 2)
#cv2.putText(frame, 'How are you', (x - 1, y - 1), cv2.FONT_HERSHEY_PLAIN,2,(0, 255, 0))
#if the puttext at here, it will write the text on top of each face detected. But I just need the text appear once.
# Display the resulting frame
cv2.imshow('Video', frame)
if len(faces) > 0:
cv2.putText(img = frame, text = 'How are you', org = (int(frameWidth/2 - 20),int(frameHeight/2)), fontFace = cv2.FONT_HERSHEY_DUPLEX, fontScale = 3,
color = (0, 255, 0))
#print(int(frameWidth/2 - 20),int(frameHeight/2))
#print('Found ' + str(len(faces)) + ' face(s)')
if cv2.waitKey(1) & 0xFF == ord('q'):
break
# When everything is done, release the capture
video_capture.release()
cv2.destroyAllWindows()
您在}的结果。将
putText
之前调用了imshow
,因此您永远看不到{imshow
语句移到waitKey
之前的行。在相关问题 更多 >
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