Segmentation Fault with HoughLinesPointSet #21029
Description
System information (version)
- OpenCV => 4.5
- Operating System / Platform => Linux 64 Bit
- Compiler => ? (whatever was used to build the opencv-python package)
Detailed description
The function HoughLinesPointSet crashes randomly with Segmentation Faults.
The Hough accumulator (histogram of angles and distances that define lines) is populated using a pointer and an index calculated from r, the distance to a candidate line. The accumulator is initialized independently from the point coordinates, however r depends on the point coordinates, and thus can lead to memory access outside the accumulator.
opencv/modules/imgproc/src/hough.cpp
Line 976 in 6f4160c
Steps to reproduce
import sys
import numpy as np
import cv2
print(sys.version)
print(np.__version__)
print(cv2.__version__)
from cv2 import HoughLinesPointSet
def foo():
points = np.array([(100, 100), (1000, 1000), (10000, 10000), (100000, 100000)])
# Create array shape required by opencv
# https://stackoverflow.com/questions/47402445/need-help-in-understanding-error-for-cv2-undistortpoints/47403282#47403282
points = points[:, np.newaxis, :].astype('float32')
## Hough transform config
# rho: distance origin to closest point on line
rhoMin = 0
rhoMax = 10
rhoStep = 0.1
# theta: angle between x-axis and line connection closest point to origin
# limit line search to horizontal lines
thetaMin = np.deg2rad(85)
thetaMax = np.deg2rad(95)
thetaStep = np.deg2rad(1)
lines_max = 5
threshold = 100
HoughLinesPointSet(points, lines_max, threshold, rhoMin, rhoMax, rhoStep, thetaMin, thetaMax, thetaStep)
for i in range(1000):
foo()Output:
3.9.6 (default, Jul 30 2021, 16:35:19)
[GCC 7.5.0]
1.21.1
4.5.4-dev
Segmentation fault (core dumped)
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 solution - I updated to latest OpenCV version and the issue is still there
- There is reproducer code and related data files: videos, images, onnx, etc