[Python] cv2.error:(-215:Assertion failed) !_src.empty() in function 'cv::cvtColor'

cv2.error: OpenCV(4.0.0) C:\projects\opencv-python\opencv\modules\imgproc\src\color.cpp:181: error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor'

Reference code:

http://blog.tramvm.com/2017/05/recognize-text-from-image-with-python.html

this is the python code for extracting text from an image

when i tried to run the code i am getting the above mentioned error

CODE:

import cv2
import numpy as np
import pytesseract
from PIL import Image

# Path of working folder on Disk
src_path = "C:\\Users\\preetha\\PycharmProjects\\OCR"

def get_string(img_path):
# Read image with opencv
img = cv2.imread(img_path)

# Convert to gray
img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

# Apply dilation and erosion to remove some noise
kernel = np.ones((1, 1), np.uint8)
img = cv2.dilate(img, kernel, iterations=1)
img = cv2.erode(img, kernel, iterations=1)

# Write image after removed noise
cv2.imwrite(src_path + "removed_noise.png", img)

# Apply threshold to get image with only black and white
#img = cv2.adaptiveThreshold(img, 255, cv2.ADAPTIVE_THRESH_GAUSSIAN_C, cv2.THRESH_BINARY, 31, 2)

# Write the image after apply opencv to do some ...
cv2.imwrite(src_path + "thres.png", img)

# Recognize text with tesseract for python
result = pytesseract.image_to_string(Image.open(src_path + "thres.png"))

# Remove template file
#os.remove(temp)

return result


print ("--- Start recognize text from image ---")
print (get_string(src_path + "1.png"))

print ("------ Done -------")


I also tried by changing the path directories to '/' or '\' still not getting any results... Any solutions please?

Continue reading...