OpenCV error: (-215:Assertion failed) inv_scale_x > 0 in function 'cv::resize'

Question

import numpy as np
import cv2

img = cv2.imread(r"C:\Users\User\Documents\sypder\try\bird.jpg", cv2.IMREAD_UNCHANGED)
print('Original Dimension:',img.shape)

scale_percentage = 30
width = int(img.shape[0] * scale_percentage/100)
height = int(img.shape[0] * scale_percentage/100)
dim = (width,height)
resized = cv2.resize(img,dim,interpolation = cv2.INTER_AREA)
print('Resized image',resized.shape)

cv2.imwrite('resized.jpg',resized)
cv2.imshow("Resized image",resized)

cv2.waitKey(0)

error:ile "C:/Users/User/Documents/sypder/try/resize.py", line 18, in resized = cv2.resize(img,dim,interpolation = cv2.INTER_AREA) error: OpenCV(4.5.5) D:\a\opencv-python\opencv-python\opencv\modules\imgproc\src\resize.cpp:4055: error: (-215:Assertion failed) inv_scale_x > 0 in function 'cv::resize'

Answer 1

could you check whether the img path is correct or not? if the path is incorrect, the img might be null and report an error while resizing. Could you add a line after line 123 to check whether the img is read successfully? assert img!=None, "Image reading error. Check whether your image path is correct or not."

If this is the case, please double check your image path.