检测并修复文本偏斜 [英] Detect and fix text skew

问题描述

有没有办法（使用像OpenCV这样的东西）来检测文本偏斜并通过旋转图像来纠正它？非常喜欢这个？

如果你知道角度，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

根据您的上述评论，这里是基于教程的代码，可能会有帮助。

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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