python videocature_【python模块 VideoCapture 使用】

【python模块 VideoCapture 使用】

也就是python的摄像头模块，官方介绍如下：

VideoCapture is a Pythonextension for Win32 which makes it possible to access video-capture devices (e.g. a USB webcam). It consists of a low-level native module (vidcap.pyd) and a high-level module written in Python (VideoCapture.py) which should be used solely.

Also included are some tools which can be used to periodically upload a WebCam-image to a WebServer, monitor and save a picture at a given URL to the local disk, and so on. Please refer to the README.txt file in the 'Tools' folder for further details.

从网站上拉下来的是一个集合包，包含了python各版本的支持，安装的时候直接把相应版本的lib，libs目录覆盖到python目录下即可。

最简单的使用方法如下：

from VideoCapture import Device

cam = Device()

cam.SaveSnapshot("xxx.jpg") #使用到图片库

唯一的一个类是Device,包含如下方法：

1 Methods defined here:

2

3 __init__(self, devnum=0, showVideoWindow=0)

4 devnum: VideoCapture enumerates the available video capture devices

5 on your system. If you have more than one device, specify

6 the desired one here. The device number starts from 0.

7

8 showVideoWindow: 0 ... do not display a video window (the default)

9 1 ... display a video window

10

11 Mainly used for debugging, since the video window

12 can not be closed or moved around.

13 displayCaptureFilterProperties(self)

14 Displays a dialog containing the property page of the capture filter.

15

16 For VfW drivers you may find the option to select the resolution most

17 likele here.

18 displayCapturePinProperties(self)

19 Displays a dialog containing the property page of the capture pin.

20

21 For WDM drivers you may find the option to select the resolution most

22 likele here.

23 displayPropertyPage(self)

24 deprecated

25

26 Use the methods displayCaptureFilterProperties() and

27 displayCapturePinProperties() instead.

28 getBuffer(self)

29 Returns a string containing the raw pixel data.

30

31 You probably don't want to use this function, but rather getImage() or32 saveSnapshot().

33 getImage(self, timestamp=0, boldfont=0, textpos='bl')

34 Returns a PIL Image instance.

35

36 timestamp: 0 ... no timestamp (the default)

37 1 ... simple timestamp

38 2 ... timestamp with shadow

39 3 ... timestamp with outline

40

41 boldfont: 0 ... normal font (the default)

42 1 ... bold font

43

44 textpos: The position of the timestamp can be specified by a string

45 containing a combination of two characters. One character

46 must be either t or b, the other one either l, c or r.

47

48 t ... top

49 b ... bottom

50

51 l ... left

52 c ... center

53 r ... right

54

55 The default value is 'bl'

56 saveSnapshot(self, filename, timestamp=0, boldfont=0, textpos='bl', **keywords)

57 Saves a snapshot to the harddisk.

58

59 The filetype depends on the filename extension. Everything that PIL

60 can handle can be specified (foo.jpg, foo.gif, foo.bmp, ...).

61

62 filename: String containing the name of the resulting file.

63

64 timestamp: see getImage()

65

66 boldfont: see getImage()

67

68 textpos: see getImage()

69

70 Additional keyword arguments can be give which are just passed to the

71 save() method of the Image class. For example you can specify the

72 compression level of a JPEG image by quality=75 (which is the default

73 value anyway).

74 setResolution(self, width, height)

75 Sets the capture resolution. (without dialog)

76

77 (contributed by Don Kimber )

78

79 --------------------------------------------------------------------------------

80 Data and non-method functions defined here:

81

82 __doc__ = 'Create instances of this class which will then r...leten the instance first (e.g. del cam).nn'

83 __module__ = 'VideoCapture'

这个库很简单，主要是GetImage和GetSnapshot两个方法的使用

网上的一段有意思的代码：

View Code

1 from VideoCapture import Device

2 import ImageDraw, sys, pygame, time

3 from pygame.locals import *

4 from PIL import ImageEnhance

5

6 res = (640,480)

7 pygame.init()

8 cam = Device()

9 cam.setResolution(res[0],res[1])

10 screen = pygame.display.set_mode((640,480))

11 pygame.display.set_caption(Webcam)

12 pygame.font.init()

13 font = pygame.font.SysFont("Courier",11)

14

15 def disp(phrase,loc):

16 s = font.render(phrase, True, (200,200,200))

17 sh = font.render(phrase, True, (50,50,50))

18 screen.blit(sh, (loc[0]+1,loc[1]+1))

19 screen.blit(s, loc)

20

21 brightness = 1.0

22 contrast = 1.0

23 shots = 0

24

25 while 1:

26 camshot = ImageEnhance.Brightness(cam.getImage()).enhance(brightness)

27 camshot = ImageEnhance.Contrast(camshot).enhance(contrast)

28 for event in pygame.event.get():

29 if event.type == pygame.QUIT: sys.exit()

30 keyinput = pygame.key.get_pressed()

31 if keyinput[K_1]: brightness -= .1

32 if keyinput[K_2]: brightness += .1

33 if keyinput[K_3]: contrast -= .1

34 if keyinput[K_4]: contrast += .1

35 if keyinput[K_q]: cam.displayCapturePinProperties()

36 if keyinput[K_w]: cam.displayCaptureFilterProperties()

37 if keyinput[K_s]:

38 filename = str(time.time()) + ".jpg"

39 cam.saveSnapshot(filename, quality=80, timestamp=0)

40 shots += 1

41 camshot = pygame.image.frombuffer(camshot.tostring(), res, "RGB")

42 screen.blit(camshot, (0,0))

43 disp("S:" + str(shots), (10,4))

44 disp("B:" + str(brightness), (10,16))

45 disp("C:" + str(contrast), (10,28))

46 pygame.display.flip()