From 96fdbc58e12748a2b47c024b6b4ba7a3edc5e55e Mon Sep 17 00:00:00 2001
From: Alexander Smorkalov <alexander.smorkalov@opencv.ai>
Date: Tue, 5 Aug 2025 10:09:12 +0300
Subject: [PATCH] Convert grayscale frames into color in nteractive calibration
 preview

---
 apps/interactive-calibration/frameProcessor.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/apps/interactive-calibration/frameProcessor.cpp b/apps/interactive-calibration/frameProcessor.cpp
index aaeabe6fbb..6da0f1fabe 100644
--- a/apps/interactive-calibration/frameProcessor.cpp
+++ b/apps/interactive-calibration/frameProcessor.cpp
@@ -308,7 +308,10 @@ cv::Mat CalibProcessor::processFrame(const cv::Mat &frame)
 {
     cv::Mat frameCopy;
     cv::Mat frameCopyToSave;
-    frame.copyTo(frameCopy);
+    if (frame.channels() == 1)
+        cv::cvtColor(frame, frameCopy, cv::COLOR_GRAY2BGR);
+    else
+        frame.copyTo(frameCopy);
     bool isTemplateFound = false;
     mCurrentImagePoints.clear();