opencv runtime_error ai_generated true

cv::findContours: invalid contour retrieval mode

ID: opencv/contour-hierarchy-error

Also available as: JSON · Markdown
82%Fix Rate
86%Confidence
3Evidence
2023-01-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
4 active — — —

Root Cause

findContours parameter mismatch or input not binary.

generic

Workarounds

  1. 92% success Ensure input is binary: use threshold() or Canny() before findContours
  2. 88% success Choose appropriate retrieval mode: RETR_EXTERNAL for outer contours only

Dead Ends

Common approaches that don't work:

  1. Use RETR_LIST for all cases 68% fail

    Loses hierarchy information

  2. Skip contour detection 78% fail

    No shape analysis