1
我有以下代碼：運行服務器一起無限循環在Python
#!/usr/bin/python
import StringIO
import subprocess
import os
import time
from datetime import datetime
from PIL import Image
# Original code written by brainflakes and modified to exit
# image scanning for loop as soon as the sensitivity value is exceeded.
# this can speed taking of larger photo if motion detected early in scan
# Motion detection settings:
# need future changes to read values dynamically via command line parameter or xml file
# --------------------------
# Threshold - (how much a pixel has to change by to be marked as "changed")
# Sensitivity - (how many changed pixels before capturing an image) needs to be higher if noisy view
# ForceCapture - (whether to force an image to be captured every forceCaptureTime seconds)
# filepath - location of folder to save photos
# filenamePrefix - string that prefixes the file name for easier identification of files.
threshold = 10
sensitivity = 180
forceCapture = True
forceCaptureTime = 60 * 60 # Once an hour
filepath = "/home/pi/camera"
filenamePrefix = "capture"
# File photo size settings
saveWidth = 1280
saveHeight = 960
diskSpaceToReserve = 40 * 1024 * 1024 # Keep 40 mb free on disk
# Capture a small test image (for motion detection)
def captureTestImage():
command = "raspistill -w %s -h %s -t 500 -e bmp -o -" % (100, 75)
imageData = StringIO.StringIO()
imageData.write(subprocess.check_output(command, shell=True))
imageData.seek(0)
im = Image.open(imageData)
buffer = im.load()
imageData.close()
return im, buffer
# Save a full size image to disk
def saveImage(width, height, diskSpaceToReserve):
keepDiskSpaceFree(diskSpaceToReserve)
time = datetime.now()
filename = filepath + "/" + filenamePrefix + "-%04d%02d%02d-%02d%02d%02d.jpg" % (time.year, time.month, time.day, time.hour, time.minute, time.second)
subprocess.call("raspistill -w 1296 -h 972 -t 1000 -e jpg -q 15 -o %s" % filename, shell=True)
print "Captured %s" % filename
# Keep free space above given level
def keepDiskSpaceFree(bytesToReserve):
if (getFreeSpace() < bytesToReserve):
for filename in sorted(os.listdir(filepath + "/")):
if filename.startswith(filenamePrefix) and filename.endswith(".jpg"):
os.remove(filepath + "/" + filename)
print "Deleted %s to avoid filling disk" % filename
if (getFreeSpace() > bytesToReserve):
return
# Get available disk space
def getFreeSpace():
st = os.statvfs(".")
du = st.f_bavail * st.f_frsize
return du
# Get first image
image1, buffer1 = captureTestImage()
# Reset last capture time
lastCapture = time.time()
# added this to give visual feedback of camera motion capture activity. Can be removed as required
os.system('clear')
print " Motion Detection Started"
print " ------------------------"
print "Pixel Threshold (How much) = " + str(threshold)
print "Sensitivity (changed Pixels) = " + str(sensitivity)
print "File Path for Image Save = " + filepath
print "---------- Motion Capture File Activity --------------"
while (True):
# Get comparison image
image2, buffer2 = captureTestImage()
# Count changed pixels
changedPixels = 0
for x in xrange(0, 100):
# Scan one line of image then check sensitivity for movement
for y in xrange(0, 75):
# Just check green channel as it's the highest quality channel
pixdiff = abs(buffer1[x,y][1] - buffer2[x,y][1])
if pixdiff > threshold:
changedPixels += 1
# Changed logic - If movement sensitivity exceeded then
# Save image and Exit before full image scan complete
if changedPixels > sensitivity:
lastCapture = time.time()
saveImage(saveWidth, saveHeight, diskSpaceToReserve)
break
continue
# Check force capture
if forceCapture:
if time.time() - lastCapture > forceCaptureTime:
changedPixels = sensitivity + 1
# Swap comparison buffers
image1 = image2
buffer1 = buffer2
此代碼需要的圖片，一旦檢測到移動，並保持這樣做，直到我手動停止。 （我應該指出，該代碼是與樹莓派電腦使用）
我也有彌敦道Jhaveri以下代碼禮貌這裏＃2：
import SocketServer
from BaseHTTPServer import BaseHTTPRequestHandler
def some_function():
print "some_function got called"
class MyHandler(BaseHTTPRequestHandler):
def do_GET(self):
if self.path == '/captureImage':
saveImage(saveWidth, saveHeight, diskSpaceToReserve)
self.send_response(200)
httpd = SocketServer.TCPServer(("", 8080), MyHandler)
httpd.serve_forever()
此代碼運行，將執行一個簡單的服務器
saveImage(saveWidth, saveHeight, diskSpaceToReserve)
在服務器上訪問url/captureImage時的功能。儘管如此，我遇到了一個問題。由於這兩段代碼都是無限循環，所以它們不能並排運行。我假設我需要做一些多線程，但這是我以前從未在Python中進行過實驗的東西。如果有人能幫助我回到正軌，我將不勝感激。