From a548765c78e3edf1077ac3f601ad05ffa21418ba Mon Sep 17 00:00:00 2001
From: John O'Keefe <jrokeefe@protonmail.com>
Date: Mon, 13 Apr 2026 20:14:02 -0400
Subject: [PATCH] fix(opencv): correct contour type for findContours

Changed contours from cv.Mat to cv.MatVector to match OpenCV.js API
requirements. The findContours method expects a MatVector for contour
storage, not a single Mat object. This fixes a potential runtime error
when using OpenCV-based panel detection.
---
 panel-detection/opencv.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/panel-detection/opencv.js b/panel-detection/opencv.js
index 412ccbf..ff02d3f 100644
--- a/panel-detection/opencv.js
+++ b/panel-detection/opencv.js
@@ -5,7 +5,7 @@ export async function detectPanelsOpenCV(imageData, cv) {
   const gray = new cv.Mat();
   const blurred = new cv.Mat();
   const edges = new cv.Mat();
-  const contours = new cv.Mat();
+  const contours = new cv.MatVector();
   const hierarchy = new cv.Mat();
 
   try {