树莓派如何实现动作捕捉抓拍存储图像脚本

这篇文章主要介绍了树莓派如何实现动作捕捉抓拍存储图像脚本，具有一定借鉴价值，感兴趣的朋友可以参考下，希望大家阅读完这篇文章之后大有收获，下面让小编带着大家一起了解一下。

具体内容如下

#!/usr/bin/python# original script by brainflakes, improved by pageauc, peewee2 and Kesthal# www.raspberrypi.org/phpBB3/viewtopic.php?f=43&t=45235# You need to install PIL to run this script# type "sudo apt-get install python-imaging-tk" in an terminal window to do thisimport StringIOimport subprocessimport osimport timefrom datetime import datetimefrom PIL import Image# Motion detection settings:# 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, values True or False# filepath      - location of folder to save photos# filenamePrefix   - string that prefixes the file name for easier identification of files.# diskSpaceToReserve - Delete oldest images to avoid filling disk. How much byte to keep free on disk.# cameraSettings   - "" = no extra settings; "-hf" = Set horizontal flip of image; "-vf" = Set vertical flip; "-hf -vf" = both horizontal and vertical flipthreshold = 10sensitivity = 20forceCapture = TrueforceCaptureTime = 60 * 60 # Once an hourfilepath = "/home/pi/picam"filenamePrefix = "capture"diskSpaceToReserve = 40 * 1024 * 1024 # Keep 40 mb free on diskcameraSettings = ""# settings of the photos to savesaveWidth  = 1296saveHeight = 972saveQuality = 15 # Set jpeg quality (0 to 100)# Test-Image settingstestWidth = 100testHeight = 75# this is the default setting, if the whole image should be scanned for changed pixeltestAreaCount = 1testBorders = [ [[1,testWidth],[1,testHeight]] ] # [ [[start pixel on left side,end pixel on right side],[start pixel on top side,stop pixel on bottom side]] ]# testBorders are NOT zero-based, the first pixel is 1 and the last pixel is testWith or testHeight# with "testBorders", you can define areas, where the script should scan for changed pixel# for example, if your picture looks like this:##   ....XXXX#   ........#   ........## "." is a street or a house, "X" are trees which move arround like crazy when the wind is blowing# because of the wind in the trees, there will be taken photos all the time. to prevent this, your setting might look like this:# testAreaCount = 2# testBorders = [ [[1,50],[1,75]], [[51,100],[26,75]] ] # area y=1 to 25 not scanned in x=51 to 100# even more complex example# testAreaCount = 4# testBorders = [ [[1,39],[1,75]], [[40,67],[43,75]], [[68,85],[48,75]], [[86,100],[41,75]] ]# in debug mode, a file debug.bmp is written to disk with marked changed pixel an with marked border of scan-area# debug mode should only be turned on while testing the parameters abovedebugMode = False # False or True# Capture a small test image (for motion detection)def captureTestImage(settings, width, height):  command = "raspistill %s -w %s -h %s -t 200 -e bmp -n -o -" % (settings, width, height)  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 diskdef saveImage(settings, width, height, quality, diskSpaceToReserve):  keepDiskSpaceFree(diskSpaceToReserve)  time = datetime.now()  filename = filepath + "/" + filenamePrefix + "-ddd-ddd.jpg" % (time.year, time.month, time.day, time.hour, time.minute, time.second)  subprocess.call("raspistill %s -w %s -h %s -t 200 -e jpg -q %s -n -o %s" % (settings, width, height, quality, filename), shell=True)  print "Captured %s" % filename# Keep free space above given leveldef 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/%s to avoid filling disk" % (filepath,filename)        if (getFreeSpace() > bytesToReserve):          return# Get available disk spacedef getFreeSpace():  st = os.statvfs(filepath + "/")  du = st.f_bavail * st.f_frsize  return du# Get first imageimage1, buffer1 = captureTestImage(cameraSettings, testWidth, testHeight)# Reset last capture timelastCapture = time.time()while (True):  # Get comparison image  image2, buffer2 = captureTestImage(cameraSettings, testWidth, testHeight)  # Count changed pixels  changedPixels = 0  takePicture = False  if (debugMode): # in debug mode, save a bitmap-file with marked changed pixels and with visible testarea-borders    debugimage = Image.new("RGB",(testWidth, testHeight))    debugim = debugimage.load()  for z in xrange(0, testAreaCount): # = xrange(0,1) with default-values = z will only have the value of 0 = only one scan-area = whole picture    for x in xrange(testBorders[z][0][0]-1, testBorders[z][0][1]): # = xrange(0,100) with default-values      for y in xrange(testBorders[z][1][0]-1, testBorders[z][1][1]):  # = xrange(0,75) with default-values; testBorders are NOT zero-based, buffer1[x,y] are zero-based (0,0 is top left of image, testWidth-1,testHeight-1 is botton right)        if (debugMode):          debugim[x,y] = buffer2[x,y]          if ((x == testBorders[z][0][0]-1) or (x == testBorders[z][0][1]-1) or (y == testBorders[z][1][0]-1) or (y == testBorders[z][1][1]-1)):            # print "Border %s %s" % (x,y)            debugim[x,y] = (0, 0, 255) # in debug mode, mark all border pixel to blue        # 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          if (debugMode):            debugim[x,y] = (0, 255, 0) # in debug mode, mark all changed pixel to green        # Save an image if pixels changed        if (changedPixels > sensitivity):          takePicture = True # will shoot the photo later        if ((debugMode == False) and (changedPixels > sensitivity)):          break # break the y loop      if ((debugMode == False) and (changedPixels > sensitivity)):        break # break the x loop    if ((debugMode == False) and (changedPixels > sensitivity)):      break # break the z loop  if (debugMode):    debugimage.save(filepath + "/debug.bmp") # save debug image as bmp    print "debug.bmp saved, %s changed pixel" % changedPixels  # else:  #   print "%s changed pixel" % changedPixels  # Check force capture  if forceCapture:    if time.time() - lastCapture > forceCaptureTime:      takePicture = True  if takePicture:    lastCapture = time.time()    saveImage(cameraSettings, saveWidth, saveHeight, saveQuality, diskSpaceToReserve)  # Swap comparison buffers  image1 = image2  buffer1 = buffer2

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