[Opencv] video reading and some simple image processing

1. Preface

As a computer image processing tool, opencv began to show some irreplaceable advantages due to free disclosure, copyright, and so on (it has been shown for a long time ). Well, I have been working with MATLAB in my graduate school. I always feel like debugging, verification, or Matlab is useful! Not long ago, I started to get in touch with opencv. I always felt that although it was a tool, the water was very deep. Well, it's always a pitfall about opencv. Record your learning trajectory.
Self-built slot 1: There are some pitfalls in the basic image processing, and some of them are not completed. After a few days, start to fill in the pitfalls, not too bad (= !! Self-hypnosis)
Self-built tucao 2: but no one is really waiting to see it (= Good sang Xin !)

2. Video reading and Image Display 2.1 read images from AVI Files

For image processing, the initial experiment code basically starts by reading an image and displaying it. This is the "Hello world!" of image processing !". Opencv reads an image and displays the following code.

<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>

In fact, it is equivalent toimread(),imshow()Andfigure()It is worth noting that if you want to expand the image in the window along with the window, you can use the cv_window_normal style, that is, the following code.

<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>

The video reading function is similar to the image reading function.

cvCreateFileCapture(argv[1])Read a video. Then use the FunctioncvQueryFrame(capture)Take one frame of the image, and then display the image (cvShowImage()). It is displayed frame by frame at a certain interval.

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[Opencv] video reading and some simple image processing