Videocapture Library makes Python video high-speed transfer program

1, the first is the video data [camera image] acquisition, usually can use VFW in VC or VB implementation, this library I use not good, so has been not how to use. Now we are using Python's videocapture library, this library is very simple to use, as follows:

Copy the Code code as follows:

From videocapture import Device
Cam = Device ()
Cam.setresolution (320,240) #设置显示分辨率
Cam.savesnapshot (' demo.jpg ') #抓取并保存图片

In this way, you get a picture.
Of course, to achieve a relatively high-speed acquisition, it is not possible to save the picture every time, so that each time to collect a picture is nearly 1 seconds, this speed we are unbearable.
A better solution is to do this directly: Im = Cam.getimage (), return an Image object, is a block of memory, and it is much quicker to operate on it.
2. How do I transfer pictures? I don't know how pplive this video is transmitted, my idea is simple, every time I send a picture.
In this program, the size of each transmitted RGB image is 160*120. In this way, the amount of data required is: D = 160*120*3 = 56.25 KB
I choose 80000B.
Here is the send-side code:

Copy the Code code as follows:

Import socket
Import Image
From videocapture import Device
Cam = Device ()
Cam.setresolution (320,240)
Clisocket = Socket.socket (socket.af_inet, socket. SOCK_DGRAM)
While 1:
im = Cam.getimage ()
im = Im.resize ((160,120))
da = im.tostring ()
Clisocket.sendto (DA, ("127.0.0.1", 1234))
S.close ()

3, how to display pictures in real time?
I use Pygame as the real-time image display interface, because Pygame is an optimized high-speed graphics library, do not know if there is no use of DirectShow, I think it should be used.
For Pygame please refer to www.pygame.org
Here is the receive-side code:

Copy the Code code as follows:

Import socket
Import Image
Import Os,sys,pygame
From pygame.locals Import *

Pygame.init ()
Screen = Pygame.display.set_mode ((160,120))
Pygame.display.set_caption ("web cam")

Pygame.display.flip ()
Svrsocket = Socket.socket (socket.af_inet, socket. SOCK_DGRAM)
Svrsocket.bind (("127.0.0.1", 1234))
Clock = Pygame.time.Clock () #计算帧速
While 1:
Data, address = Svrsocket.recvfrom (80000)
Camshot = Pygame.image.frombuffer (data, (160,120), "RGB")
For event in Pygame.event.get ():
if Event.type = = Pygame. QUIT:sys.exit ()
Screen.blit (Camshot, (0,0))
Pygame.display.update ()
Print Clock.get_fps () #在终端打印帧速
Clock.tick ()

The program finally finished, test the effect how to put, in order to facilitate, I have the client and the server is set to the local, the port is 1234.
Run the program, wow, it's unbelievable, the highest reached 230fps! (Right-hand terminal)

