1,首先是视频数据[摄像头图像]的采集,通常可以使用vfw在vc或者vb下实现,这个库我用的不好,所以一直不怎么会用.现在我们用到的是python的videocapture库,这个库用起来很简单,如下:
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
这样,你就得到了一张图片.
当然,要实现比较高速的采集,每次都要保存图片是不大可能的,这样弄下来每次采集一张图片已经接近1秒钟,这个速度我们是无法忍受的.
更好的解决方式是直接这样: im = cam.getImage(),返回的是一个Image对象,是一个内存块,对它操作就快速多了.
2,如何传输图片?我不知道pplive这种视频是怎么传输的,我的想法很简单,每次传送一幅图片.
在本程序中,每次传送的RGB图像的大小为 160*120.这样,需要的数据量为:d = 160*120*3 = 56.25 kB
我选择80000B.
下面是发送端代码:
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,如何实时显示图片?
我使用了pygame作为实时图像显示界面,因为pygame是经过优化的高速图形库,不知道有没有使用directshow,我想应该用了吧..
关于pygame请参考 www.pygame.org
下面是接收端代码:
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()
程序终于完成了,测试一下效果怎么样把,为了方便,我把客户端和服务端都设成了本机,端口为1234.
运行程序,哇,简直不可思议,最高竟然达到230fps!(右边的终端)

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