简述数字影像与模拟影像有什么区别

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                    <table cellspacing="1" bordercolor="#111111" width="97%" id="AutoNumber1"><tbody><tr><td width="100%" style="font-size: 9pt; line-height: 14pt;"><span style="font-size: 18px;">   </span><p><span style="font-size: 18px;">所谓数字影像，指的是完全以一种有规则的数字量的集合来表现的物理图像。 </span></p><p><span style="font-size: 18px;"><br  />数字影像的特点是：灰阶动态范围大；密度分辩率相对较高；线性好；层次丰富； 可进行后处理；辐射剂量小。</span></p><p><span style="font-size: 18px;"> <br  />所谓模拟影像，是以一种直观的物理量来连续地、形象地表现出另一种物理特性的图案。它的特点是：连续、直观、获取方便。图像表现具有概观性与实时动态获取等特点。 </span></p><p><span style="font-size: 18px;"><br  />但模拟影像重复性较差，一旦成像无法再改变或进行后处理；灰阶动态范围小。 </span></p><p><span style="font-size: 18px;"><br  />数字影像与模拟影像到底有什么实质上的区别是：</span></p><p><span style="font-size: 18px;"> <br  /><strong>成像类型</strong>：</span></p><p><span style="font-size: 18px;">一个是数字，一个是模拟； <br  /><strong>成像特点</strong>：</span></p><p><span style="font-size: 18px;">一个是一次采集，多重成像；一个是一次采集，固定不变。 <br  /><strong>存储与传输方式</strong>：</span></p><p><span style="font-size: 18px;">一个是无胶片化，软性传输；一个是硬性存储与传输。</span></p></td></tr></tbody></table><p style=""><img src="http://mmbiz.qpic.cn/mmbiz/rz7R73cuHRrv6jdOCoJeZmYwvEAIoHpY0a7yJL2egiaEokLTpwkIsIRTzTFUic09aEThKHS4hrEcSqU0lAS3tu5g/0" data-ratio="0.14784394250513347" data-w="487" width="auto" width="auto" src="http://mmbiz.qpic.cn/mmbiz/rz7R73cuHRrv6jdOCoJeZmYwvEAIoHpY0a7yJL2egiaEokLTpwkIsIRTzTFUic09aEThKHS4hrEcSqU0lAS3tu5g/0?tp=webp" style="margin: 0px; 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