With the rapid development of the computer and network technology, medical digital image communication is a new cross-subject based on computer network and medicine.

随着计算机技术及网络技术的突飞猛进，医学数字图像通信成为医学和计算机网络的交叉新型学科。

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The modern communication theory is used in the analysis of imaging systems. The object information density model is built for analogue and digital image respectively.

应用现代通信理论对成像系统进行了分析， 建立了模拟和数字图像的目标信息密度模型。

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So the digital image compression technology and the digital image encryption technology have been born and applied in many field, such as multimedia, communication, medicine and so on.

数字图像压缩技术和数字图像加密技术应运而生，并且被广泛应用到多媒体、通讯、医学等等各个领域。

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