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对于我这个超级网虫来说,能够从彩显上看到自己或亲友、网友的实时动态图像,一直是期待已久的事情.三个月前曾买了一个中档的视频卡,外加一个输出模拟视频信号的彩色摄像头.效果却不尽人意.原因是该卡是通过并行口(打印口)与电脑连接的,数据传输速度太慢了,还需要从键盘口取电源(+5V).按320×240的分辨率来拍摄时,显示的图像令人不敢恭维,比木偶片还差,一跳一跳的,极不流畅,录像时失帧现象很严重(高达39%).后来,通过阅读各种有关电脑的书刊杂志之后,知道唯有购买带USB接口的电脑专用摄像头,方可得到较好的图像.因为USB接口的连接速度比现有的计算机串口、并口的连接速度快得多,比并口速度快10倍,比串口速度快100倍,并支持即插即用,支持热拔插,可同时连接多达127个计算机外部设备,更可为外设提供电源,也就是说,
For me this super bug, to see from the color on their own friends or relatives, friends, real-time dynamic images, has been the long-awaited thing. Three months ago bought a mid-range video card, plus an output simulation Video signal color camera. The effect is unsatisfactory. The reason is that the card is connected to the computer through the parallel port (print port), the data transfer speed is too slow, but also need to take power from the keyboard (+5 V). Press 320 × 240 resolution to shoot, the display of the image is flattered, worse than the puppet film, hopping, very fluent, video frame loss phenomenon is very serious (up to 39%). Later, by After reading books and magazines about computers, you know that you can get better images only by purchasing a computer-only camera with a USB port, because the connection speed of the USB port is much faster than that of the existing computer serial port and parallel port , 10 times faster than the parallel port, faster than the serial port 100 times, and supports plug and play, hot-swappable, up to 127 computer peripherals can be connected at the same time, but also provide power for peripherals, that is,