I have a image containing multiple tables, some tables have missing inner horizontal borders which is causing merged cells with AWS Textract
This is the original image original image I tried this approach from https://stackoverflow.com/a/67141649:
import cv2
import numpy as np
# read image
img = cv2.imread("table.png")
hh, ww = img.shape[:2]
# convert to grayscale
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
# average gray image to one column
column = cv2.resize(gray, (1,hh), interpolation = cv2.INTER_AREA)
# threshold on white
thresh = cv2.threshold(column, 254, 255, cv2.THRESH_BINARY)[1]
# get contours
contours = cv2.findContours(thresh, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
contours = contours[0] if len(contours) == 2 else contours[1]
# loop over contours and get bounding boxes and ycenter and draw horizontal line at ycenter
result = img.copy()
for cntr in contours:
x,y,w,h = cv2.boundingRect(cntr)
ycenter = y+h//2
cv2.line(result, (0,ycenter), (ww-1,ycenter), (0, 0, 0), 2)
# write results
cv2.imwrite("table_lines2.png", result)
# display results
cv2.imshow("RESULT", result)
cv2.waitKey(0)
and this is the result that i got: result after this approach
this is the expected result: expected result
I'm new to opencv and appreciate any help
