Automatic perspective correction for quadrilateral objects

perspective-quadrilateral.ipynb

Hello,

I have tried running this but it only ever finds one line in the card. Specifically, it grabs the right edge of the card. Do you have any thoughts as to what could be causing this?

As lines has shape of (x,y,z) we have to iterate in to two for loops, as well as indicate inside of the HoughLinesP arguments th np.array[], as it follows:

lines = cv2.HoughLinesP(bw_canny, 1, np.pi/180, 70, np.array([]), minLineLength=30, maxLineGap=10)
line_image = np.copy(image)
for line in lines:
for x1,y1,x2,y2 in line:
cv2.line(line_image,(x1,y1),(x2,y2),(255,0,0),3)

I am also getting line in right part of the image. Any solution for that?
@RAMIRO-GM , @mistiansen