Objective: to develop a method of using video capture card to realize the capture and digitalized store and transmission of ultrasound images.

目的采用视频采集卡实现超声图像采集与数字化存储传输。

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It presents smart card system of session key distribution for communications safety to net video conference transmission, resolves user identity authentication with security.

为网络视频会议传输提供有效的通信安全，采用一个会议密钥分配的智能卡系统，来解决使用者身份认证和通信安全问题。

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