Cropping white from image goes wrong :(

Python
9

F*CK YEAH found my solution.

Thank you for helping! It helped a lot!

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Sat Jul 30 21:26:56 2022

@author: windhoos
"""

import cv2
import numpy as np
#import sys
import os

# get the path/directory
folder_dir = os.path.dirname(__file__)

for images in os.listdir(folder_dir):
 
    # check if the image ends with png
    if (images.endswith(".png")):
        
        img = cv2.imread(images)
        
        info = np.iinfo(img.dtype) # Get the information of the incoming image type
        img = img.astype(np.float64) / info.max # normalize the data to 0 - 1
        img = 255 * img # Now scale by 255
        img = img.astype(np.uint8)
        ## (1) Convert to gray, and threshold
        gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
        th, threshed = cv2.threshold(gray, 120, 255, cv2.THRESH_BINARY_INV)
        
        ## (2) Morph-op to remove noise
        kernel = cv2.getStructuringElement(cv2.MORPH_ELLIPSE, (11,11))
        morphed = cv2.morphologyEx(threshed, cv2.MORPH_CLOSE, kernel)
        
        ## (3) Find contours
        contours, hierarchy = cv2.findContours(morphed, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
        
        xmin=[]
        xmax=[]
        ymin=[]
        ymax=[]
        for c in contours:
            x,y,w,h = cv2.boundingRect(c)
            xmin.append(x)
            xmax.append(x+w)
            ymin.append(y)
            ymax.append(y+h)
            
        xmin=min(xmin)
        xmax=max(xmax)
        ymin=min(ymin)
        ymax=max(ymax)
        cv2.rectangle(img, (xmin, ymin), (xmax, ymax), (0,0,0), 2)
        dst = img[ymin:ymax, xmin:xmax]
        cv2.imwrite('cv_'+images, dst)