diff --git a/samples/edge.go b/samples/edge.go
index 19fa1eb..ac9d416 100644
--- a/samples/edge.go
+++ b/samples/edge.go
@@ -7,15 +7,15 @@ package main
 import (
 	"fmt"
 	"os"
-  "path"
-  "runtime"
+	"path"
+	"runtime"
 
-  //"github.com/lazywei/go-opencv/opencv"
+	//"github.com/lazywei/go-opencv/opencv"
 	"../opencv" // can be used in forks, comment in real application
 )
 
 func main() {
-  _, currentfile, _, _ := runtime.Caller(0)
+	_, currentfile, _, _ := runtime.Caller(0)
 	filename := path.Join(path.Dir(currentfile), "../images/lena.jpg")
 	if len(os.Args) == 2 {
 		filename = os.Args[1]
@@ -79,5 +79,3 @@ func main() {
 
 	os.Exit(0)
 }
-
-
diff --git a/samples/hellocv.go b/samples/hellocv.go
index 6ddceb0..185caac 100644
--- a/samples/hellocv.go
+++ b/samples/hellocv.go
@@ -7,15 +7,15 @@ package main
 import (
 	"fmt"
 	"os"
-  "path"
-  "runtime"
+	"path"
+	"runtime"
 
-  //"github.com/lazywei/go-opencv/opencv"
+	//"github.com/lazywei/go-opencv/opencv"
 	"../opencv" // can be used in forks, comment in real application
 )
 
 func main() {
-  _, currentfile, _, _ := runtime.Caller(0)
+	_, currentfile, _, _ := runtime.Caller(0)
 	filename := path.Join(path.Dir(currentfile), "../images/lena.jpg")
 	if len(os.Args) == 2 {
 		filename = os.Args[1]
@@ -43,5 +43,3 @@ func main() {
 
 	opencv.WaitKey(0)
 }
-
-
diff --git a/samples/inpaint.go b/samples/inpaint.go
index 60b0e59..000948d 100644
--- a/samples/inpaint.go
+++ b/samples/inpaint.go
@@ -7,15 +7,15 @@ package main
 import (
 	"fmt"
 	"os"
-  "path"
-  "runtime"
+	"path"
+	"runtime"
 
-  //"github.com/lazywei/go-opencv/opencv"
+	//"github.com/lazywei/go-opencv/opencv"
 	"../opencv" // can be used in forks, comment in real application
 )
 
 func main() {
-  _, currentfile, _, _ := runtime.Caller(0)
+	_, currentfile, _, _ := runtime.Caller(0)
 	filename := path.Join(path.Dir(currentfile), "../images/fruits.jpg")
 	if len(os.Args) == 2 {
 		filename = os.Args[1]
@@ -94,5 +94,3 @@ func main() {
 	}
 	os.Exit(0)
 }
-
-
diff --git a/samples/player.go b/samples/player.go
index 3113c8c..9637609 100644
--- a/samples/player.go
+++ b/samples/player.go
@@ -7,10 +7,8 @@ package main
 import (
 	"fmt"
 	"os"
-  "path"
-  "runtime"
 
-  //"github.com/lazywei/go-opencv/opencv"
+	//"github.com/lazywei/go-opencv/opencv"
 	"../opencv" // can be used in forks, comment in real application
 )
 
@@ -58,18 +56,26 @@ func main() {
 	for {
 		if !stop {
 			img := cap.QueryFrame()
-			if img == nil { break }
+			if img == nil {
+				break
+			}
 
 			frame_pos := int(cap.GetProperty(opencv.CV_CAP_PROP_POS_FRAMES))
-			if frame_pos >= frames { break }
+			if frame_pos >= frames {
+				break
+			}
 			win.SetTrackbarPos("Seek", frame_pos)
 
 			win.ShowImage(img)
-			key := opencv.WaitKey(1000/fps)
-			if key == 27 { os.Exit(0) }
+			key := opencv.WaitKey(1000 / fps)
+			if key == 27 {
+				os.Exit(0)
+			}
 		} else {
 			key := opencv.WaitKey(20)
-			if key == 27 { os.Exit(0) }
+			if key == 27 {
+				os.Exit(0)
+			}
 		}
 	}
 
diff --git a/samples/webcam.go b/samples/webcam.go
index f404412..53d5117 100644
--- a/samples/webcam.go
+++ b/samples/webcam.go
@@ -1,12 +1,12 @@
 package main
 
 import (
-  "fmt"
+	"fmt"
 	"os"
-  //"path"
-  //"runtime"
+	//"path"
+	//"runtime"
 
-  //"github.com/lazywei/go-opencv/opencv"
+	//"github.com/lazywei/go-opencv/opencv"
 	"../opencv" // can be used in forks, comment in real application
 )
 
@@ -14,29 +14,29 @@ func main() {
 	win := opencv.NewWindow("Go-OpenCV Webcam")
 	defer win.Destroy()
 
-  cap := opencv.NewCameraCapture(0)
+	cap := opencv.NewCameraCapture(0)
 	if cap == nil {
 		panic("can not open camera")
 	}
-  defer cap.Release()
+	defer cap.Release()
 
-  win.CreateTrackbar("Thresh", 1, 100, func(pos int, param ...interface{}) {
-    for {
-      if cap.GrabFrame() {
-        img := cap.RetrieveFrame(1)
-        if img != nil {
-          ProcessImage(img, win, pos)
-        } else {
-          fmt.Println("Image ins nil")
-        }
-      }
+	win.CreateTrackbar("Thresh", 1, 100, func(pos int, param ...interface{}) {
+		for {
+			if cap.GrabFrame() {
+				img := cap.RetrieveFrame(1)
+				if img != nil {
+					ProcessImage(img, win, pos)
+				} else {
+					fmt.Println("Image ins nil")
+				}
+			}
 
-      if key := opencv.WaitKey(10); key == 27 {
-        os.Exit(0)
-      }
-    }
-  })
-  opencv.WaitKey(0)
+			if key := opencv.WaitKey(10); key == 27 {
+				os.Exit(0)
+			}
+		}
+	})
+	opencv.WaitKey(0)
 }
 
 func ProcessImage(img *opencv.IplImage, win *opencv.Window, pos int) error {
@@ -55,16 +55,16 @@ func ProcessImage(img *opencv.IplImage, win *opencv.Window, pos int) error {
 
 	opencv.CvtColor(img, gray, opencv.CV_BGR2GRAY)
 
-  opencv.Smooth(gray, edge, opencv.CV_BLUR, 3, 3, 0, 0)
-  opencv.Not(gray, edge)
+	opencv.Smooth(gray, edge, opencv.CV_BLUR, 3, 3, 0, 0)
+	opencv.Not(gray, edge)
 
-  // Run the edge detector on grayscale
-  opencv.Canny(gray, edge, float64(pos), float64(pos*3), 3)
+	// Run the edge detector on grayscale
+	opencv.Canny(gray, edge, float64(pos), float64(pos*3), 3)
 
-  opencv.Zero(cedge)
-  // copy edge points
-  opencv.Copy(img, cedge, edge)
+	opencv.Zero(cedge)
+	// copy edge points
+	opencv.Copy(img, cedge, edge)
 
-  win.ShowImage(cedge)
-  return nil
+	win.ShowImage(cedge)
+	return nil
 }