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1.序言

作为一个计算机图像处理的工具，因为免费公开呀，版权等等的原因，openCV开始展现出一些无可取代的优势（已经展露好久了好吧）。嘛，之前我研究生阶段，一直再用MATLAB在干活，总感觉调试呀，验证啊，还是MATLAB要好用一些呢！不久前，自己也开始接触了openCV，总感觉虽然都是工具，但是水很深的样子。嘛，总是还是开个关于openCV的坑，记录下自己的学习的轨迹吧。 
自带吐槽1：基础的图像处理部分的坑，还有一些没有整理完，等过几天开始整理完后，再开始填坑吧，不算烂尾不算烂尾（= =!!自我催眠） 
自带吐槽2：不过话说也没谁真的在等着看吧（= = 好桑心！）

2.视频的读入与图像的显示

2.1从AVI文件中读取图像

对于图像处理来说，最开始的实验代码，基本都是从读取一幅图像，然后将其显示出来开始入手的。这是图像处理的“Hello World！”。openCV里将一枚图像读入，并显示的代码如下所示。

<code class="hljs cs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background: transparent;">IplImage* ori= cvLoadImage(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"..\\Data\\Fig0320(4) (bottom_left).tif"</span>,Gray_image);    
cvNamedWindow(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Original"</span>, CV_WINDOW_AUTOSIZE );   <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//new window</span>
cvShowImage(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Original"</span>,ori);        <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//show</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li></ul>

其实也就相当于MATLAB里面的imread()，imshow()与figure()这三个函数；这里值得说的是，如果要让窗口内图片跟着窗口一起扩大的话，可以使用式样CV_WINDOW_NORMAL，也就是如下代码所示。

<code class="hljs scss has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-function" style="box-sizing: border-box;">cvNamedWindow(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Original"</span>, CV_WINDOW_NORMAL )</span>;   <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//new window</span>
<span class="hljs-function" style="box-sizing: border-box;">cvShowImage(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Original"</span>,ori)</span>;        <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//show</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>

对于视频的读入，其实和图像是差不多一样的，使用函数 

cvCreateFileCapture(argv[1])去读入一段视频。然后通过函数cvQueryFrame(capture)将其一帧一帧的取出来，然后再用显示图像的方式(cvShowImage())，将其按照一定的时间间隔，逐帧显示出来。

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[openCV]视频的读入与一些简单的图像处理

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原文地址：http://blog.csdn.net/jiestyle21/article/details/45896495