Body: <p>The demand is to locate the invoice within a camera captured image about that invoice. The invoice is always a white paper with printed black or blue characters, tables and red stamps. Sometimes the background behind the invoice is dark(about 60% of all the samples), but others are not. Sometimes there is shadow on it.
  The question is how to detect the vertices, edges and corners of the invoice in this image? What algorithms should be applied? The android application CamScanner seems to have this function but not is effective every time. So does the CIDetector interface on iOS. What algorithms does CamScanner or iOS use(traditional or deep)?</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2019-05-13T03:24:29.163Z
Comments.Text: Does anyone has any suggestions?
Comments.UserDisplayName: piratesailor
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2019-05-14T02:08:30.297Z
Comments.Text: @DuttaA Thanks a lot! I have posted it here: https://datascience.stackexchange.com/questions/51911/how-to-locate-the-invoice-within-a-camera-captured-image .
Comments.UserDisplayName: piratesailor
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2019-05-14T02:58:04.823Z
Comments.Text: @DuttaA Would you please recommend someone to answer my question?
Comments.UserDisplayName: piratesailor
Tags: <image-recognition>
Title: How to locate the invoice within a camera captured image?
UserDisplayName: piratesailor
ThreadText: # How to locate the invoice within a camera captured image?
  
  (Asked by: username_0 on 2019-05-11)
  
  The demand is to locate the invoice within a camera captured image about that invoice. The invoice is always a white paper with printed black or blue characters, tables and red stamps. Sometimes the background behind the invoice is dark(about 60% of all the samples), but others are not. Sometimes there is shadow on it.
  The question is how to detect the vertices, edges and corners of the invoice in this image? What algorithms should be applied? The android application CamScanner seems to have this function but not is effective every time. So does the CIDetector interface on iOS. What algorithms does CamScanner or iOS use(traditional or deep)?
  
  **Tags:** image-recognition
  
  > **Comments:**
  > **username_0**: Does anyone has any suggestions?  
  > **username_0**: @DuttaA Thanks a lot! I have posted it here: https://datascience.stackexchange.com/questions/51911/how-to-locate-the-invoice-within-a-camera-captured-image .  
  > **username_0**: @DuttaA Would you please recommend someone to answer my question?  
  
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