How to deskew an image in an unknown condition? [closed]
 
  
 
  
 
 
 
 
 
 asked May 13 '15 
 
 cv_new gravatar image  
 
 
 
 
 
I knew that there is a getPerspectiveTransform function in OpenCV to perform the deskew work, it is very useful under a known condition. However, the destination matrix used is well-defined by users. 
 
Suppose that there are different type of cards we want to make a recognition, but those are in different sizes and skew in different angles, which result in the failure of using getPerspectiveTransform. What can I do if I try to use getPerspectiveTransform?
 
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Closed for the following reason
      question is not relevant or outdated by
      sturkmen 

      close date 2020-10-17 11:07:49.080785
 
 
Comments
If you have photos of cards in different positions you can use this but this one is detecting the points more correct IMHO.
thdrksdfthmn gravatar imagethdrksdfthmn (May 13 '15)edit
Thank you, thdrksdfthmn. I have read the first passage before, but the destination image's size used in that code is well-defined as I said, which is ( cv::Mat quad = cv::Mat::zeros(300, 220, CV_8UC3)  ). So in my case, when I'm unable to determine the original object's size, using that deskewing way may not work.
cv_new gravatar imagecv_new (May 14 '15)edit
I do not really understand your case... Can you post some more info, like a photo of input image or something like that?
thdrksdfthmn gravatar imagethdrksdfthmn (May 15 '15)edit
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