From e7995b4d5d8f0497b1afb2dd8d302d3eb9885d55 Mon Sep 17 00:00:00 2001
From: ericgreveson <eric@greveson.co.uk>
Date: Sat, 18 May 2013 23:31:22 +0200
Subject: [PATCH] Take account of multi-channel matrices when comparing
 histograms

Ensure that all channels are considered when comparing multi-channel histograms
---
 modules/imgproc/src/histogram.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/modules/imgproc/src/histogram.cpp b/modules/imgproc/src/histogram.cpp
index da50a404d6..5ae1db6a9f 100644
--- a/modules/imgproc/src/histogram.cpp
+++ b/modules/imgproc/src/histogram.cpp
@@ -1980,7 +1980,7 @@ double cv::compareHist( InputArray _H1, InputArray _H2, int method )
     {
         const float* h1 = (const float*)it.planes[0].data;
         const float* h2 = (const float*)it.planes[1].data;
-        len = it.planes[0].rows*it.planes[0].cols;
+        len = it.planes[0].rows*it.planes[0].cols*H1.channels();
 
         if( method == CV_COMP_CHISQR )
         {