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'链接已经复制到剪贴板');" value="http://forum.oecr.com/plugin.php?id=attachcenter:page&aid=40282" size="50" /></p> </div> <div class="bm"> <div class="bm_c xld"> <b>全息模拟问题求助:</b><div class="postmsg"><i class="pstatus"> 本帖最后由 yiheyou 于 2009-4-29 19:59 编辑 </i><br /> <br /> 我用matlab模拟了字母“E”的记录和再现，参考光波为平面波，但并没得到正确的结果。<br /> 全息图频谱图像应该是直流项和正负一级组成的三个光斑，可是我模拟出来只有一个小光点。 角谱传递函数再现后就只有一个原图像；SFFT（菲涅耳一次傅立叶变换）再现后全息图的频谱图也出现这种问题。而且当改变距离或者把采样点数该为256，就完全不对了。<br /> 角谱传递函数模拟中的距离和参物角参考了附件中的文献。<br /> 程序中fourier和invfourier函数功能分别与fftshift(fft2)和fftshift(ifft2)一样。<br /> 我感觉程序本身没问题，问题应该出在采样或者距离的取值上。望高手指点，谢过～<br /> <br /> 角谱结果：<br /> <img src="data/attachment/forum/month_0904/090429195772ff996afed06b02.jpg" onload="javascript:if(this.width>600)this.width=600;"><br /> SFFT结果：<br /> <img src="data/attachment/forum/month_0904/09042919597a7daf040e548bee.jpg" onload="javascript:if(this.width>600)this.width=600;"><br /> 模拟源程序：<br /> </div> <div class="postmsg">SFFT的结果说明应该是干涉或者再现距离没满足采样定理。但怎样才算满足呢</div> <div class="postmsg">哪位大侠有正确的源程序不妨上传上来供我们学习学习</div> <div class="postmsg">你的结果应该是叠频了，我这有一个采样频率的公式，是我们老师自己总结的，如果想要，可以联系我，365354097，顺便说一下，我们老师说这个公式很多学校都不会明说的，也算是一个小秘密吧，所以我也不好在这论坛上说了，请理解！！！！<img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /></div> <div class="postmsg">用的是角谱法吗?角谱法和传播距离无关，可能是你物像空间分辨率调整的不好吧。</div> <div class="postmsg"><div class="quote"><blockquote>你的结果应该是叠频了，我这有一个采样频率的公式，是我们老师自己总结的，如果想要，可以联系我，365354097，顺便说一下，我们老师说这个公式很多学校都不会明说的，也算是一个小秘密吧，所以我也不好在这论坛上说了 ...<br /> <font size="2"><font color="#999999">超少 发表于 2009-4-30 17:28</font> <a href="http://bbs.oecr.com/redirect.php?goto=findpost&pid=547038&ptid=86319" target="_blank"><img id="aimg_n6A1e" onclick="zoom(this, this.src, 0, 0, 0)" class="zoom" src="static/image/common/back.gif" onmouseover="img_onmouseoverfunc(this)" onload="thumbImg(this)" border="0" alt="" /></a></font></blockquote></div><br /> 你的公式肯定是让物像空间间隔相等的拉，哈哈，这个公式好多论文上都有</div> <div class="postmsg">哈哈 既然在这里看到我师兄了 不错不错 哈哈 超少师兄，老师知道了又要批你了哦 哈哈 开玩笑了</div> <div class="postmsg">膜拜下lz的程序 写得真心好<img src="static/image/smiley/default/em17.gif" smilieid="46" border="0" alt="" /> 请问下频谱图的问题解决了吗 我也遇到类似问题 求指教 </div> <img src="data/attachment/forum/month_0904/09042919597a7daf040e548bee.jpg" alt="全息模拟问题求助: SFFT.jpg" title="全息模拟问题求助: SFFT.jpg" onload="javascript:if(this.width>600)this.width=600;"> <div style="height200px;"></div> <ul class="xl xl2 cl" style="border-top: 1px #cccccc dashed;margin:5px 0 ;padding-top:5px"> <dl><b> 同一主题资料:</b></dl> <dl style="margin:10px 1px;display:inline"><a href="attachcenter-page.html?aid=40281" title="角谱.jpg"><img src="data/attachment/forum/month_0904/090429195772ff996afed06b02.jpg" alt="角谱.jpg" title="角谱.jpg" onload="javascript:if(this.width>130)this.width=130;"></a></dl> <dl style="margin:10px 1px;display:inline"><a href="attachcenter-page.html?aid=40282" title="SFFT.jpg"><img src="data/attachment/forum/month_0904/09042919597a7daf040e548bee.jpg" alt="SFFT.jpg" title="SFFT.jpg" 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