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I'd like to build an exam correction app. From a paper multiple choice question (mcq) I'd like to use my camera to analyse it and get a score. This exist in python https://www.pyimagesearch.com/2016/10/03/bubble-sheet-multiple-choice-scanner-and-test-grader-using-omr-python-and-opencv/

Does someone know a lib in javascript for this ? enter image description here

Damien Romito
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  • Are you looking to build the algorithm yourself or does it have to be an existing solution? If you are a bit familar with image processing, you could rebuild the algorithm of the article you posted with opencv, as there are opencv bindings available for javascript. – justadudewhohacks Oct 09 '17 at 11:24
  • I don't find openCV for a mobile cross-plateform framework ... (Buildable on Android and iOS) The solution I found is to use react-native with ar.js... but it's very recent. Maybe not stable – Damien Romito Oct 10 '17 at 10:12

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I am doing the same thing. As I found out, you should not use Javascript due to performance reason. You should do the following steps:

  • Write a native module for Android or iOS or C++ for both to handle image
  • Write a native module to process frames from camera to get appropriate frame and pass it to the image handling module.
  • Bridge all them to React Native side, handle them like other native libraries

Read more about native module: https://reactnative.dev/docs/0.60/native-modules-android

You may need OpenCV library to handle your images

Thanh Tùng
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    Check this link to see if it could help: OpenCV for JS: https://docs.opencv.org/3.4/d5/d10/tutorial_js_root.html – Thanh Tùng May 04 '21 at 05:54