用过USB摄像头的都知道,你需要使用鼠标来操作它,比如截个图,录个像什么的,要点N次鼠标,对于我们那些不喜欢多次点击鼠标的人来说,这是一件很boring的事情,所以,本文将教你如何使用Python来操作摄像头。
这里,我们需要三个Python库: VideoCapture, PIL 和 pygame。使用这三个库你可以非常容易的编写一个摄像头程序。之所以使用pygame,其目的就是因为这个库可以处理视频帧(fps)。下面是代码:
from VideoCapture import Device
import ImageDraw, sys, pygame, time
from pygame.locals import *
from PIL import ImageEnhance
res = (640,480)
pygame.init()
cam = Device()
cam.setResolution(res[0],res[1])
screen = pygame.display.set_mode((640,480))
pygame.display.set_caption('Webcam')
pygame.font.init()
font = pygame.font.SysFont("Courier",11)
def disp(phrase,loc):
s = font.render(phrase, True, (200,200,200))
sh = font.render(phrase, True, (50,50,50))
screen.blit(sh, (loc[0]+1,loc[1]+1))
screen.blit(s, loc)
brightness = 1.0
contrast = 1.0
shots = 0
while 1:
camshot = ImageEnhance.Brightness(cam.getImage()).enhance(brightness)
camshot = ImageEnhance.Contrast(camshot).enhance(contrast)
for event in pygame.event.get():
if event.type == pygame.QUIT: sys.exit()
keyinput = pygame.key.get_pressed()
if keyinput[K_1]: brightness -= .1
if keyinput[K_2]: brightness += .1
if keyinput[K_3]: contrast -= .1
if keyinput[K_4]: contrast += .1
if keyinput[K_q]: cam.displayCapturePinProperties()
if keyinput[K_w]: cam.displayCaptureFilterProperties()
if keyinput[K_s]:
filename = str(time.time()) + ".jpg"
cam.saveSnapshot(filename, quality=80, timestamp=0)
shots += 1
camshot = pygame.image.frombuffer(camshot.tostring(), res, "RGB")
screen.blit(camshot, (0,0))
disp("S:" + str(shots), (10,4))
disp("B:" + str(brightness), (10,16))
disp("C:" + str(contrast), (10,28))
pygame.display.flip()
这段代码中的一些要点的解释如下:
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