Python OpenCV 错误：（-215：断言失败）_step >= minstep in function 'cv::Mat::Mat'

Question

I'm trying to get python-opencv running, but I always get this error:

image = cv.cvtColor(image, cv.COLOR_RGB2BGR)
cv2.error: OpenCV(4.5.4-dev) D:\a\opencv-python\opencv-python\opencv\modules\core\src\matrix.cpp:466: error: (-215:Assertion failed) _step >= minstep in function 'cv::Mat::Mat'

This path part is really strange "D:\\a\\opencv-" I never even had a D: drive.

This is my code (Windows 10, python 3.8, pycharm, pipenv)

import cv2 as cv
import numpy as np
import pyautogui as pg


def make_screenshot(x=0, y=0, x_length=1920, y_length=1080, debug=False):
    image = pg.screenshot(region=(x, y, x_length, y_length))
    image = np.array(image)
    image = cv.cvtColor(image, cv.COLOR_RGB2BGR)
    if debug:
        cv.imshow('test', image)
        cv.waitKey()
    return image


print(make_screenshot(0, 0, 1, 1, False))

Checked already without success:

error: (-215:Assertion failed) _step >= minstep in function 'cv::Mat::Mat'

error: (-215:Assertion failed) !ssize.empty() in function 'cv::resize' OpenCV

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

Answer 1

Do you need to convert it to an array?

Maybe use the .imread() function as well.

image = cv2.imread(image)