OpenCV使用Python和烧瓶:HIGHGUI错误:libv4l无法ioctl S_FMT [英] Opencv using python and flask : HIGHGUI ERROR: libv4l unable to ioctl S_FMT
问题描述
我试图在camera.py的摄像头上放置一个图像,然后发送到main.py;输出显示在烧瓶生成的本地服务器上。但是我遇到了以下错误:
pre $ lib $ 4 $ p $ lib $ 4 $ b $ p $ l $ $ $ $ $ $ $ libg4l2错误设置pixformat设备或资源繁忙
HIGHGUI ERROR libv4l无法ioctl S_FMT
libv4l2:错误设置pixformat:设备或资源繁忙
libv4l1:错误设置pixformat:设备或资源繁忙
HIGHGUI错误:libv4l无法ioctl VIDIOCSPICT
我使用了下面的代码:
$ b
main.py
来自瓶子的导入Flask,render_template,Response $ b $从相机导入VideoCamera
app = Flask (__name__)
@ app.route('/')
def index():
return render_template('index.html')
def gen(相机):
而真:
frame = camera.get_frame()
yield(b' - frame \\\\''
b'Content-类型:image / jpeg\r\\\
\r\\\
'+ frame + b'\r\\\
\r\\\
')
@ app.route('/ video_fe ()),
mimetype ='multipart / x-mixed-replace;}
def video_feed():
返回响应(gen(VideoCamera() border = frame')
if __name__ =='__main__':
app.run(host ='0.0.0.0',debug = True)
camera.py
import cv2, time
import numpy as np
$ b $ class VideoCamera(object):
def __init __(self):
#使用OpenCV从设备0中捕获。从网络摄像头捕捉
#,将下面的行注释掉,并使用视频文件
#来代替。
self.video = cv2.VideoCapture(0)
#如果您决定使用video.mp4,您必须在文件夹
#中将此文件作为main.py。
#self.video = cv2.VideoCapture('video.mp4')
def __del __(self):
self.video.release()
def get_frame(self):
成功,frame = self.video.read()
#我们使用Motion JPEG,但OpenCV默认捕捉原始图像
#所以我们必须将其编码为JPEG以正确显示
#视频流。
#time.sleep(.1)
face_cascade = cv2.CascadeClassifier('haarcascades / haarcascade_frontalface_default.xml')
eye_cascade = cv2.CascadeClassifier('haarcascades / haarcascade_mcs_eyepair_small.xml')
#载入覆盖图:glasses.png
imgGlasses = cv2.imread('4.png',-1)
print imgGlasses is None
#为眼镜创建遮罩
imgGlassesGray = cv2.cvtColor(imgGlasses,cv2.COLOR_BGR2GRAY)
#cv2.imwrite(imgGlassesGray.png,imgGlassesGray)
ret,orig_mask = cv2.threshold(imgGlassesGray,0,255,cv2.THRESH_BINARY)
#cv2.imwrite(orig_mask.png,orig_mask)
#创建倒置的蒙版对于眼镜
orig_mask_inv = cv2.bitwise_not(orig_mask)
#cv2.imwrite(orig_mask_inv.png,orig_mask_inv)
#将眼镜图像转换为BGR
#并保存原始图像大小(稍后在重新调整图像大小时使用)
imgGlasses = imgGlasses [:,:,0:3]
origGlassesHeight,origGlassesWidth = imgGlasses.shape [:2]
video_capture = cv2.VideoCapture(0)
#真:
#ret,frame = video_capture.read()
gray = cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)
faces = face_cascade.detectMultiScale(gray,1.3,5,flags = cv2.cv.CV_HAAR_SCALE_IMAGE)
$ b $ for(x,y,w,h)in:
cv2.rectangle( (x,y),(x + w,y + h),(255,0,0),2)
roi_gray = gray [y:y + h,x:x + w]
roi_color = frame [y:y + h,x:x + w]
eyes = eye_cascade.detectMultiScale(roi_gray)
(ex,ey,ew, eh)眼睛:
cv2.rectangle(roi_color,(ex,ey),(ex + ew,ey + eh),(0,255,0),1)
for ,ey,ew,eh)眼睛:
glassesWidth = 3 * ew
glassesHeight = glassesWidth * origGlassesHeight / origGlassesWidth
#居中眼镜
x1 = ex - 15
x2 = ex + ew + 15
y1 = ey - 5
y2 = ey + eh + 15
#检查剪切
如果x1 < 0:
x1 = 0
如果y1 < 0:
y1 = 0
if x2> w:
x2 = w
如果y2> h:
y2 = h
#重新计算眼镜图片的宽度和高度
glassesWidth = x2 - x1
glassesHeight = y2 - y1
#将原始图像和面具重新调整到眼镜大小
#在
以上计算玻璃= cv2.resize(imgGlasses,(glassesWidth,glassesHeight),interpolation = cv2.INTER_AREA)
mask = cv2.resize(orig_mask,(glassesWidth,glassesHeight),interpolation = cv2.INTER_AREA)
mask_inv = cv2.resize(orig_mask_inv,(glassesWidth,glassesHeight),interpolation = cv2.INTER_AREA)
#从背景中获取与眼镜大小相等的眼镜ROI image
roi = roi_color [y1:y2,x1:x2]
#roi_bg仅包含原始图像眼镜不是
#的区域是眼镜的大小。
roi_bg = cv2.bitwise_and(roi,roi,mask = mask)
#roi_fg包含眼镜只有在眼镜是
的地方roi_fg = cv2.bitwise_and(glasses ,glasses,mask = mask_inv)
#加入roi_bg和roi_fg
dst = cv2.add(roi_bg,roi_fg)
#以回溯原始图像
roi_color [y1:y2,x1:x2] = dst
break
ret,jpeg = cv2.imencode('。 jpg',frame)
return jpeg.tobytes()
index.html
< html>
< head>
< title>视频流式演示< / title>
href ={{url_for('static',
filename ='styles.css')}} >
< style>
body {
background-image:url(http://cdn.wall88.com/51b487f75df1050061.jpg);
背景重复:不重复;
}
< / style>
< / style>
< / head>
< body>
< h1>视频串流演示< / h1>
< / body>
< / html>
尝试删除 I am trying to place an image over a webcam feed in camera.py and send to main.py; output displayed in a flask generated local server . But I encountered the following error I used the following code: debug = True 在
main.py
中。这对我造成了问题。 libv4l2: error setting pixformat: Device or resource busy
HIGHGUI ERROR: libv4l unable to ioctl S_FMT
libv4l2: error setting pixformat: Device or resource busy
libv4l1: error setting pixformat: Device or resource busy
HIGHGUI ERROR: libv4l unable to ioctl VIDIOCSPICT
main.py
from flask import Flask, render_template, Response
from camera import VideoCamera
app = Flask(__name__)
@app.route('/')
def index():
return render_template('index.html')
def gen(camera):
while True:
frame = camera.get_frame()
yield (b'--frame\r\n'
b'Content-Type: image/jpeg\r\n\r\n' + frame + b'\r\n\r\n')
@app.route('/video_feed')
def video_feed():
return Response(gen(VideoCamera()),
mimetype='multipart/x-mixed-replace; boundary=frame')
if __name__ == '__main__':
app.run(host='0.0.0.0', debug=True)
camera.py
import cv2, time
import numpy as np
class VideoCamera(object):
def __init__(self):
# Using OpenCV to capture from device 0. If you have trouble capturing
# from a webcam, comment the line below out and use a video file
# instead.
self.video = cv2.VideoCapture(0)
# If you decide to use video.mp4, you must have this file in the folder
# as the main.py.
# self.video = cv2.VideoCapture('video.mp4')
def __del__(self):
self.video.release()
def get_frame(self):
success, frame = self.video.read()
# We are using Motion JPEG, but OpenCV defaults to capture raw images,
# so we must encode it into JPEG in order to correctly display the
# video stream.
#time.sleep(.1)
face_cascade = cv2.CascadeClassifier('haarcascades/haarcascade_frontalface_default.xml')
eye_cascade = cv2.CascadeClassifier('haarcascades/haarcascade_mcs_eyepair_small.xml')
# Load the overlay image: glasses.png
imgGlasses = cv2.imread('4.png', -1)
print imgGlasses is None
# Create the mask for the glasses
imgGlassesGray = cv2.cvtColor(imgGlasses, cv2.COLOR_BGR2GRAY)
#cv2.imwrite("imgGlassesGray.png", imgGlassesGray)
ret, orig_mask = cv2.threshold(imgGlassesGray, 0, 255, cv2.THRESH_BINARY)
#cv2.imwrite("orig_mask.png", orig_mask)
# Create the inverted mask for the glasses
orig_mask_inv = cv2.bitwise_not(orig_mask)
#cv2.imwrite("orig_mask_inv.png", orig_mask_inv)
# Convert glasses image to BGR
# and save the original image size (used later when re-sizing the image)
imgGlasses = imgGlasses[:,:,0:3]
origGlassesHeight, origGlassesWidth = imgGlasses.shape[:2]
video_capture = cv2.VideoCapture(0)
#while True:
#ret, frame = video_capture.read()
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
faces = face_cascade.detectMultiScale(gray, 1.3, 5, flags=cv2.cv.CV_HAAR_SCALE_IMAGE)
for (x,y,w,h) in faces:
cv2.rectangle(frame,(x,y),(x+w,y+h),(255,0,0),2)
roi_gray = gray[y:y+h, x:x+w]
roi_color = frame[y:y+h, x:x+w]
eyes = eye_cascade.detectMultiScale(roi_gray)
for (ex,ey,ew,eh) in eyes:
cv2.rectangle(roi_color,(ex,ey),(ex+ew,ey+eh),(0,255,0),1)
for (ex, ey, ew, eh) in eyes:
glassesWidth = 3*ew
glassesHeight = glassesWidth * origGlassesHeight / origGlassesWidth
# Center the glasses
x1 = ex - 15
x2 = ex + ew + 15
y1 = ey - 5
y2 = ey + eh + 15
# Check for clipping
if x1 < 0:
x1 = 0
if y1 < 0:
y1 = 0
if x2 > w:
x2 = w
if y2 > h:
y2 = h
# Re-calculate the width and height of the glasses image
glassesWidth = x2 - x1
glassesHeight = y2 - y1
# Re-size the original image and the masks to the glasses sizes
# calcualted above
glasses = cv2.resize(imgGlasses, (glassesWidth,glassesHeight), interpolation = cv2.INTER_AREA)
mask = cv2.resize(orig_mask, (glassesWidth,glassesHeight), interpolation = cv2.INTER_AREA)
mask_inv = cv2.resize(orig_mask_inv, (glassesWidth,glassesHeight), interpolation = cv2.INTER_AREA)
# take ROI for glasses from background equal to size of glasses image
roi = roi_color[y1:y2, x1:x2]
# roi_bg contains the original image only where the glasses is not
# in the region that is the size of the glasses.
roi_bg = cv2.bitwise_and(roi,roi,mask = mask)
# roi_fg contains the image of the glasses only where the glasses is
roi_fg = cv2.bitwise_and(glasses,glasses,mask = mask_inv)
# join the roi_bg and roi_fg
dst = cv2.add(roi_bg,roi_fg)
# place the joined image, saved to dst back over the original image
roi_color[y1:y2, x1:x2] = dst
break
ret, jpeg = cv2.imencode('.jpg', frame)
return jpeg.tobytes()
index.html
<html>
<head>
<title>Video Streaming Demonstration</title>
<link type="text/css" rel="stylesheet"
href="{{ url_for('static',
filename='styles.css')}}" />
<style>
body {
background-image: url(http://cdn.wall88.com/51b487f75df1050061.jpg);
background-repeat: no-repeat;
}
</style>
</style>
</head>
<body>
<h1>Video Streaming Demonstration</h1>
<img id="bg" align="middle" src="{{ url_for('video_feed') }}">
</body>
</html>
Try removing debug=True
in the main.py
. That was causing the problem for me.
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