笔记_OpenCV4.5.1新增微信QRCode解码功能

原文地址：https://cloud.tencent.com/developer/article/1786320

 WeChatQRCode模块为OpenCV4.5.1新增功能，需要在github下载最新opencv源码master和contrib部分编译后使用。

下载和编译：

 

 

使用：

#include "pch.h"
#include <iostream>
#include <opencv2/opencv.hpp>
#include <opencv2/wechat_qrcode.hpp>

using namespace std;
using namespace cv;

int main()
{
  //加载图片解码
  Ptr<wechat_qrcode::WeChatQRCode> detector;
  string detect_prototxt = "./model/detect.prototxt";
  string detect_caffe_model = "./model/detect.caffemodel";
  string sr_prototxt = "./model/sr.prototxt";
  string sr_caffe_model = "./model/sr.caffemodel";

  Mat img = imread("./QR/T33/result.bmp");
  try 
  {
    detector = makePtr<wechat_qrcode::WeChatQRCode>(detect_prototxt, detect_caffe_model,
                                                  sr_prototxt, sr_caffe_model);
  }
  catch (const std::exception& e) 
  {
    cout <<
      "\n---------------------------------------------------------------\n"
      "Failed to initialize WeChatQRCode.\n"
      "Please, download 'detector.*' and 'sr.*' from\n"
      "https://github.com/WeChatCV/opencv_3rdparty/tree/wechat_qrcode\n"
      "and put them into the current directory.\n"
      "---------------------------------------------------------------\n";
    cout << e.what() << endl;
    return 0;
  }

  vector<Mat> vPoints;
  vector<String> strDecoded;
  strDecoded = detector->detectAndDecode(img, vPoints);
  for (int i = 0; i < strDecoded.size(); i++)
  {
    cout << "decode-" << i+1 << ": " << strDecoded[i] << endl;
    Point pt1 = Point((int)vPoints[i].at<float>(0, 0), (int)vPoints[i].at<float>(0, 1));
    Point pt2 = Point((int)vPoints[i].at<float>(1, 0), (int)vPoints[i].at<float>(1, 1));
    Point pt3 = Point((int)vPoints[i].at<float>(2, 0), (int)vPoints[i].at<float>(2, 1));
    Point pt4 = Point((int)vPoints[i].at<float>(3, 0), (int)vPoints[i].at<float>(3, 1));
    line(img, pt1, pt2, Scalar(0, 255, 0), 2);
    line(img, pt2, pt3, Scalar(0, 255, 0), 2);
    line(img, pt3, pt4, Scalar(0, 255, 0), 2);
    line(img, pt4, pt1, Scalar(0, 255, 0), 2);
    putText(img, strDecoded[i], pt1, 0, 0.5, Scalar(255, 0, 0), 2);
  }
  imshow("wechat_qrcode", img);
  waitKey();
  imwrite("result.png", img);

结果示例：

 使用体验：非常适用APP开发者手机端扫码使用，如果是工业应用还需要自己做预处理和增强等步骤。