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小伙伴们在日常的工作学习中，或多或少的都会遇到，将书籍或者是资料文件，用手机进行拍摄，方便文档的保存，但是由于拍摄的角度或者是拍摄手法的原因，拍摄出来的照片往往会出现偏差，阅读起来也不方便。


卧槽！逆天了，Python竟然能打造一款扫描全能王，实现图片纠正！

今天，小编就为大家制作了一款简易的扫描器，帮助大家将拍摄的图片进行纠正，并将纠正的图片进行保存，一起来看看吧。


01.效果展示

为了让大家对软件有更好的全面的认识，我们先通过视频展示的方式，来一睹为快。


02.程序讲解
接下来，我们通过程序的一点点解析，让大家更好的对软件有更好的认识。对于程序部分的讲解，我们可以拆解为两个部分：
  • 图片的纠正
  • 软件界面的构建

03.图片的纠正
对于图片的纠正，可以归结为边缘检测——>角点检测——>透视变换的过程，边缘检测的作用是检测图片中的图像的边缘，程序如下图所示。

卧槽！逆天了，Python竟然能打造一款扫描全能王，实现图片纠正！


04.边缘检测
程序通过opencv中的Canny函数来检测物体的边界，这里需要注意的是，有两个阈值数值需要调节:
  • 程序中分别用threshold_bar1和threshold_bar2两个滑动条来控制，threshold_bar2用来检测较为明显的边界;
  • 而threshold_bar1则是负责将threshold_bar2检测出来的边界进行连接，组成一个完整的物体边界信息;

通过dilate和erode函数来将边缘进行填充后，通过findContours函数，来得到物体的轮廓的位置坐标信息，程序中contours变量保存的是位置坐标数值。对于边缘检测后填充的效果，效果如下图所示：


卧槽！逆天了，Python竟然能打造一款扫描全能王，实现图片纠正！


05.角点检测

对于角点的检测，也就是对于轮廓中“角”的检测，程序如下图所示。

卧槽！逆天了，Python竟然能打造一款扫描全能王，实现图片纠正！

程序通过对于轮廓数值中每一组数值的面积计算，如果面积大于5000，就利用approxPolyDP函数对轮廓进行多边形的拟合操作;

如果拟合出来的图形是四边形的话，则说明该组轮廓数据下，检测到了类似于书本、纸张等矩形的目标，那么就返回approxPolyDP函数所拟合的四个角点坐标的数值。如下图所示。

卧槽！逆天了，Python竟然能打造一款扫描全能王，实现图片纠正！


06.透视变换

在得到拟合的角点数据之后，接下来就是要进行透视变换的操作，所谓的透视变换，可以理解为将偏斜角度拍摄的目标，转变为正视图。程序如下图所示：


卧槽！逆天了，Python竟然能打造一款扫描全能王，实现图片纠正！

程序将拟合得到的四个角点坐标，通过透视变换转变为480x640大小的正视图，程序中通过getPerspectiveTransform函数生成透视变换的变换矩阵，利用warpPerspective函数来完成对于原图的透视变换，其结果如下图所示：


卧槽！逆天了，Python竟然能打造一款扫描全能王，实现图片纠正！


07.软件界面的构建

软件界面的构建，利用的是PyQt5进行制作，其界面如下所示：

卧槽！逆天了，Python竟然能打造一款扫描全能王，实现图片纠正！

软件界面中，位于界面中央显示的是图像的展示区域，分别是原图展示，提取到的矩形目标以及最终的透视变换的结果图。

  • 界面中黄色的模块表示的是按钮控件，其中，“文件”按钮，表示选取本地的原始图片，“开始”按钮表示的是执行图片的投视变换，

  • 保存按钮则是将最终的透视变换结果进行保存。

  • “退出”按钮则是代表退出整个软件。

这里我们以“开始”按钮为例，解析一下其控制的函数。

卧槽！逆天了，Python竟然能打造一款扫描全能王，实现图片纠正！

“开始“按钮绑定openImg函数，当点击按钮时，程序通过getOpenFileName函数来选取本地的文件，获取得到本地文件的路径，并将本地的图片展示在界面当中。


08.总结
以上就是小编为大家分享的图片扫描器的内容，大家可以下载软件进行测试，需要注意的是，在图片拍摄的过程中，为了保证扫描器结果准确性，大家尽量保证拍摄图片的背景为单一的颜色，如上图中，原始图片中，书本的背景为单一的黑色，这样，最大程度的保证了结果的准确性。
觉得本篇不错的小伙伴，记得在留言区给个三连哦！

如何获取本篇资料：


在下面的「菜鸟编程大本营」后台输入，小助手，备注暗号(扫描王)




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style="max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section style="max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section mpa-from-tpl="t" style="max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"><pre style="max-width: 100%;color: rgb(63, 63, 63);letter-spacing: 0.544px;line-height: inherit;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section data-mpa-template="t" mpa-from-tpl="t" style="max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section data-id="94086" data-color="#276ca3" data-tools="135编辑器" mpa-from-tpl="t" style="max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section style="max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section mpa-from-tpl="t" style="max-width: 100%;display: inline-block;box-sizing: border-box !important;overflow-wrap: break-word !important;"><pre style="max-width: 100%;letter-spacing: 0.544px;line-height: inherit;box-sizing: border-box !important;overflow-wrap: break-word !important;"><pre data-darkmode-bgcolor-15882384789136="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882384789136="rgb(255, 255, 255)" data-style="letter-spacing: 0.544px; background-color: rgb(255, 255, 255); text-align: center; color: rgba(230, 230, 230, 0.9); font-size: 16px; line-height: 25.6px; overflow-wrap: break-word !important;" data-darkmode-bgcolor-15882396318564="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882396318564="rgb(255, 255, 255)" data-darkmode-color-15882396318564="rgba(230, 230, 230, 0.9)" data-darkmode-original-color-15882396318564="rgba(230, 230, 230, 0.9)" data-darkmode-bgcolor-15900529136199="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15900529136199="rgb(255, 255, 255)" data-darkmode-color-15900529136199="rgba(230, 230, 230, 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