From d76b976012cf47eb90720b1cd6a06fa664f20425 Mon Sep 17 00:00:00 2001
From: Aliaksandr <Aljaksandr@gmail.com>
Date: Tue, 2 Jun 2015 12:12:11 +0300
Subject: [PATCH] Bug fix for feature extraction

According to CartToPolar() function documentation, result angles could be in range (0..360). To prevent index overflow this check is important.
---
 modules/xobjdetect/src/acffeature.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/modules/xobjdetect/src/acffeature.cpp b/modules/xobjdetect/src/acffeature.cpp
index 39afc9bdf..aac2601ef 100644
--- a/modules/xobjdetect/src/acffeature.cpp
+++ b/modules/xobjdetect/src/acffeature.cpp
@@ -307,6 +307,8 @@ void computeChannels(InputArray image, vector<Mat>& channels)
         for (int col = 0; col < grad.cols; ++col) {
             //float angle = atan2(row_der(row, col), col_der(row, col)) * to_deg;
             float angle = angles(row, col);
+            if (angle > 180)
+                angle -= 180;
             if (angle < 0)
                 angle += 180;
             int ind = (int)(angle / 30);