Hello,
I’m building a scanner app for identity card. After taking image from camera, I’m using OpenCV.js to detect identity card and crop it.
According to what i search, I know the steps to do what I want are:
- Convert image to gray
- Blur it
- Draw canny
- Find contours
- Draw contours
- Crop it
The source image:
Result I wish:
But I’m stucking at step find contours to draw, right now I just can make something like this:
I need that step to complete:
Below is my code:
let src = cv.imread('img');
let dst = new cv.Mat();
let ksize = new cv.Size(5, 5);
cv.cvtColor(src, dst, cv.COLOR_RGBA2GRAY);
cv.Canny(dst, dst, 75, 200, 3, false);
cv.threshold(dst, dst, 80, 255, cv.THRESH_BINARY_INV);
cv.imshow('canvasOutput', dst);
src.delete();
dst.delete();
Is there anyone know how to do this, help me please!
Thank you so much!!!