System Information

python code，Version：opencv-python 4.11.0.86
System: windows 11

Detailed description

If you use the cv.solveCubic function to solve a cubic equation, if the coefficient of cubic is very small, 10 ^-13, the solution is abnormal.

Steps to reproduce

example：

import cv2
import numpy as np


def solve_polynomial(a, b, c, d):
    roots = np.zeros(3, dtype=np.float64)
    cv2.solveCubic(np.array([a, b, c, d], dtype=np.float64), roots)
    return roots.tolist()


# example:
a = 2 * 10 ** (-13)
b = 1
c = -2
d = 1
roots = solve_polynomial(a, b, c, d)
print("root:", roots)

output：

root: [-5000000000002.0, 14339.64892578125, -14337.646728515625]

Issue submission checklist

• I report the issue, it's not a question
• I checked the problem with documentation, FAQ, open issues, forum.opencv.org, Stack Overflow, etc and have not found any solution
• I updated to the latest OpenCV version and the issue is still there
• There is reproducer code and related data files (videos, images, onnx, etc)