本文实例为大家分享了树莓派动作捕捉抓拍存储图像的具体代码，供大家参考，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 this

import stringio

import subprocess

import os

import time

from datetime import datetime

from 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 flip

threshold = 10

sensitivity = 20

forcecapture = true

forcecapturetime = 60 * 60 # once an hour

filepath = "/home/pi/picam"

filenameprefix = "capture"

diskspacetoreserve = 40 * 1024 * 1024 # keep 40 mb free on disk

camerasettings = ""

# settings of the photos to save

savewidth = 1296

saveheight = 972

savequality = 15 # set jpeg quality (0 to 100)

# test-image settings

testwidth = 100

testheight = 75

# this is the default setting, if the whole image should be scanned for changed pixel

testareacount = 1

testborders = [ [[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 above

debugmode = 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 disk

def saveimage(settings, width, height, quality, 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 %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 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/%s to avoid filling disk" % (filepath,filename)

if (getfreespace() > bytestoreserve):

return

# get available disk space

def getfreespace():

st = os.statvfs(filepath + "/")

du = st.f_bavail * st.f_frsize

return du

# get first image

image1, buffer1 = capturetestimage(camerasettings, testwidth, testheight)

# reset last capture time

lastcapture = 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

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持萬仟网。

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