通过旋转图像检测和修复文本倾斜 [英] Detect and fix text skew by rotating image

问题描述

有没有办法(使用 OpenCV 之类的东西)来检测文本倾斜并通过旋转图像来纠正它?差不多吧?

如果您知道角度，旋转图像似乎很容易，但对于我正在处理的图像，我不会......它需要以某种方式被检测到.

解决方案

根据您上面的评论，这里是基于教程的代码 ，可能会有所帮助.

Is there a way (using something like OpenCV) to detect text skew and correct it by rotating the image? Pretty much like this?

Rotating an image seems easy enough if you know the angle, but for the images I'm processing, I wont...it will need to be detected somehow.

解决方案

Based on your above comment, here is the code based on the tutorial here, working fine for the above image,

Source

Rotated

 Mat src=imread("text.png",0);
 Mat thr,dst;
 threshold(src,thr,200,255,THRESH_BINARY_INV);
 imshow("thr",thr);

  std::vector<cv::Point> points;
  cv::Mat_<uchar>::iterator it = thr.begin<uchar>();
  cv::Mat_<uchar>::iterator end = thr.end<uchar>();
  for (; it != end; ++it)
    if (*it)
      points.push_back(it.pos());

  cv::RotatedRect box = cv::minAreaRect(cv::Mat(points));
  cv::Mat rot_mat = cv::getRotationMatrix2D(box.center, box.angle, 1);

  //cv::Mat rotated(src.size(),src.type(),Scalar(255,255,255));
  Mat rotated;
  cv::warpAffine(src, rotated, rot_mat, src.size(), cv::INTER_CUBIC);
 imshow("rotated",rotated);

Edit:

Also see the answer here , might be helpful.

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