From 686e28eeeed829da8e479c4343e10600a45bba23 Mon Sep 17 00:00:00 2001
From: Vadim Pisarevsky <no@email>
Date: Thu, 29 Jul 2010 13:06:34 +0000
Subject: [PATCH] fixed roi handling in HOGDescriptor::computeGradient (ticket
 #295).

---
 modules/objdetect/src/hog.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/modules/objdetect/src/hog.cpp b/modules/objdetect/src/hog.cpp
index 9b6c30f89..43911c50d 100644
--- a/modules/objdetect/src/hog.cpp
+++ b/modules/objdetect/src/hog.cpp
@@ -200,10 +200,10 @@ void HOGDescriptor::computeGradient(const Mat& img, Mat& grad, Mat& qangle,
 
     for( x = -1; x < gradsize.width + 1; x++ )
         xmap[x] = borderInterpolate(x - paddingTL.width + roiofs.x,
-                        wholeSize.width, borderType);
+                        wholeSize.width, borderType) - roiofs.x;
     for( y = -1; y < gradsize.height + 1; y++ )
         ymap[y] = borderInterpolate(y - paddingTL.height + roiofs.y,
-                        wholeSize.height, borderType);
+                        wholeSize.height, borderType) - roiofs.y;
 
     // x- & y- derivatives for the whole row
     int width = gradsize.width;