diff --git a/opencv/cxcore.go b/opencv/cxcore.go
index ca81a59..0e5c622 100644
--- a/opencv/cxcore.go
+++ b/opencv/cxcore.go
@@ -69,6 +69,10 @@ func (img *IplImage) Release() {
 	C.cvReleaseImage(&img_c)
 }
 
+func (img *IplImage) Zero() {
+	C.cvSetZero(unsafe.Pointer(img))
+}
+
 /* Creates a copy of IPL image (widthStep may differ) */
 func (img *IplImage) Clone() *IplImage {
 	p := C.cvCloneImage((*C.IplImage)(img))
@@ -122,13 +126,13 @@ func (img *IplImage) Get1D(x int) Scalar {
 
 /* Get2D return a specific element from a 2-dimensional matrix. */
 func (img *IplImage) Get2D(x, y int) Scalar {
-	ret := C.cvGet2D(unsafe.Pointer(img), C.int(x), C.int(y))
+	ret := C.cvGet2D(unsafe.Pointer(img), C.int(y), C.int(x))
 	return Scalar(ret)
 }
 
 /* Get3D return a specific element from a 3-dimensional matrix. */
 func (img *IplImage) Get3D(x, y, z int) Scalar {
-	ret := C.cvGet3D(unsafe.Pointer(img), C.int(x), C.int(y), C.int(z))
+	ret := C.cvGet3D(unsafe.Pointer(img), C.int(z), C.int(y), C.int(x))
 	return Scalar(ret)
 }
 
@@ -139,12 +143,12 @@ func (img *IplImage) Set1D(x int, value Scalar) {
 
 /* Set2D sets a particular element in the image */
 func (img *IplImage) Set2D(x, y int, value Scalar) {
-	C.cvSet2D(unsafe.Pointer(img), C.int(x), C.int(y), (C.CvScalar)(value))
+	C.cvSet2D(unsafe.Pointer(img), C.int(y), C.int(x), (C.CvScalar)(value))
 }
 
 /* Set3D sets a particular element in the image */
 func (img *IplImage) Set3D(x, y, z int, value Scalar) {
-	C.cvSet3D(unsafe.Pointer(img), C.int(x), C.int(y), C.int(z), (C.CvScalar)(value))
+	C.cvSet3D(unsafe.Pointer(img), C.int(z), C.int(y), C.int(x), (C.CvScalar)(value))
 }
 
 /* GetMat returns the matrix header for an image.*/
@@ -217,6 +221,10 @@ func (mat *Mat) Clone() *Mat {
 	return (*Mat)(mat_new)
 }
 
+func (mat *Mat) Zero() {
+	C.cvSetZero(unsafe.Pointer(mat))
+}
+
 /*
 Reshape changes shape of the matrix without copying data. A value of `0` means
 that channels or rows remain unchanged.
diff --git a/opencv/goimage.go b/opencv/goimage.go
index 9e590a6..15804db 100644
--- a/opencv/goimage.go
+++ b/opencv/goimage.go
@@ -11,22 +11,22 @@ func DecodeImageMem(data []byte) *IplImage {
 	buf := CreateMatHeader(1, len(data), CV_8U)
 	buf.SetData(unsafe.Pointer(&data[0]), CV_AUTOSTEP)
 
-	return DecodeImage(buf, CV_LOAD_IMAGE_UNCHANGED)
+	return DecodeImage(unsafe.Pointer(buf), CV_LOAD_IMAGE_UNCHANGED)
 }
 
 /* From Image converts a go image.Image to an opencv.IplImage. */
 func FromImage(img image.Image) *IplImage {
 	b := img.Bounds()
-	model := color.NRGBAModel
+	model := color.RGBAModel
 	dst := CreateImage(
-		b.Max.Y-b.Min.Y,
 		b.Max.X-b.Min.X,
+		b.Max.Y-b.Min.Y,
 		IPL_DEPTH_8U, 4)
 
 	for y := b.Min.Y; y < b.Max.Y; y++ {
 		for x := b.Min.X; x < b.Max.X; x++ {
 			px := img.At(x, y)
-			c := model.Convert(px).(color.NRGBA)
+			c := model.Convert(px).(color.RGBA)
 
 			value := NewScalar(float64(c.B), float64(c.G), float64(c.R), float64(c.A))
 			dst.Set2D(x, y, value)
diff --git a/opencv/highgui.go b/opencv/highgui.go
index 8583b59..e2a1490 100644
--- a/opencv/highgui.go
+++ b/opencv/highgui.go
@@ -399,11 +399,11 @@ func SaveImage(filename string, image *IplImage, params int) int {
 }
 
 /* decode image stored in the buffer */
-func DecodeImage(buf *Mat, iscolor int) *IplImage {
+func DecodeImage(buf unsafe.Pointer, iscolor int) *IplImage {
 	rv := C.cvDecodeImage((*C.CvMat)(buf), C.int(iscolor))
 	return (*IplImage)(rv)
 }
-func DecodeImageM(buf *Mat, iscolor int) *Mat {
+func DecodeImageM(buf unsafe.Pointer, iscolor int) *Mat {
 	rv := C.cvDecodeImageM((*C.CvMat)(buf), C.int(iscolor))
 	return (*Mat)(rv)
 }