diff --git a/modules/objdetect/src/hog.cpp b/modules/objdetect/src/hog.cpp
index 0fca47f2878e519c43da954d8cc1f81774b93910..80b5972597129c10dff4d75d62e2b73d33e9d76a 100644
--- a/modules/objdetect/src/hog.cpp
+++ b/modules/objdetect/src/hog.cpp
@@ -820,7 +820,7 @@ const float* HOGCache::getBlock(Point pt, float* buf)
         int h0 = h[0], h1 = h[1];
 
         __m128 _a0 = _mm_set1_ps(a[0]), _a1 = _mm_set1_ps(a[1]);
-		__m128 _w = _mm_mul_ps(_mm_set1_ps(pk.gradWeight), _mm_loadu_ps(pk.histWeights));
+        __m128 _w = _mm_mul_ps(_mm_set1_ps(pk.gradWeight), _mm_loadu_ps(pk.histWeights));
         __m128 _t0 = _mm_mul_ps(_a0, _w), _t1 = _mm_mul_ps(_a1, _w);
 
         _mm_storeu_ps(hist0, _t0);
diff --git a/modules/ocl/perf/perf_calib3d.cpp b/modules/ocl/perf/perf_calib3d.cpp
index 7b14988a20a51128c73e556ffaeaee5dabf14193..d1a642edc8c705cf7255a4788e2d1a1eab432121 100644
--- a/modules/ocl/perf/perf_calib3d.cpp
+++ b/modules/ocl/perf/perf_calib3d.cpp
@@ -57,12 +57,12 @@ PERFTEST(StereoMatchBM)
 
     SUBTEST << left_image.cols << 'x' << left_image.rows << "; aloeL.jpg ;"<< right_image.cols << 'x' << right_image.rows << "; aloeR.jpg ";
 
-	Ptr<StereoBM> bm = createStereoBM(n_disp, winSize);
-	bm->compute(left_image, right_image, dst);
+    Ptr<StereoBM> bm = createStereoBM(n_disp, winSize);
+    bm->compute(left_image, right_image, dst);
 
-	CPU_ON;
-	bm->compute(left_image, right_image, dst);
-	CPU_OFF;
+    CPU_ON;
+    bm->compute(left_image, right_image, dst);
+    CPU_OFF;
 
     d_left.upload(left_image);
     d_right.upload(right_image);
diff --git a/samples/cpp/image_sequence.cpp b/samples/cpp/image_sequence.cpp
index e4815ebeaa9e27c3071229c20b69f955685cdb12..d94362161106f3b7da7ddf54bcde719e979eb438 100644
--- a/samples/cpp/image_sequence.cpp
+++ b/samples/cpp/image_sequence.cpp
@@ -10,8 +10,8 @@ static void help(char** argv)
 {
     cout << "\nThis sample shows you how to read a sequence of images using the VideoCapture interface.\n"
          << "Usage: " << argv[0] << " <image_mask> (example mask: example_%%02d.jpg)\n"
-		 << "Image mask defines the name variation for the input images that have to be read as a sequence. \n"
-		 << "Using the mask example_%%02d.jpg will read in images labeled as 'example_00.jpg', 'example_01.jpg', etc."
+         << "Image mask defines the name variation for the input images that have to be read as a sequence. \n"
+         << "Using the mask example_%%02d.jpg will read in images labeled as 'example_00.jpg', 'example_01.jpg', etc."
          << endl;
 }
 
diff --git a/samples/python2/houghcircles.py b/samples/python2/houghcircles.py
index 392e4e1c549271d8d12a9ef435746617bfdcd112..38ed6f3032d055aeddc339cbc6f6c3eb467fb2d2 100755
--- a/samples/python2/houghcircles.py
+++ b/samples/python2/houghcircles.py
@@ -13,9 +13,9 @@ import sys
 
 print __doc__
 try:
-	fn = sys.argv[1]
+    fn = sys.argv[1]
 except:
-	fn = "../cpp/board.jpg"
+    fn = "../cpp/board.jpg"
 
 src = cv2.imread(fn, 1)
 img = cv2.cvtColor(src, cv2.COLOR_BGR2GRAY)