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diff --git a/intern/libmv/libmv/image/image_converter.h b/intern/libmv/libmv/image/image_converter.h
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+// Copyright (c) 2009 libmv authors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+
+#ifndef LIBMV_IMAGE_IMAGE_CONVERTER_H
+#define LIBMV_IMAGE_IMAGE_CONVERTER_H
+
+#include "libmv/image/array_nd.h"
+
+namespace libmv {
+
+// The factor comes from http://www.easyrgb.com/
+// RGB to XYZ : Y is the luminance channel
+// var_R * 0.2126 + var_G * 0.7152 + var_B * 0.0722
+template<typename T>
+inline T RGB2GRAY(const T r, const T g, const T b) {
+  return static_cast<T>(r * 0.2126 + g * 0.7152 + b * 0.0722);
+}
+
+/*
+// Specialization for the uchar type. (that do not want to work...)
+template<>
+inline unsigned char RGB2GRAY<unsigned char>(const unsigned char r,
+                                             const unsigned char g,
+                                             const unsigned char b) {
+  return (unsigned char)(r * 0.2126 + g * 0.7152 + b * 0.0722 +0.5);
+}*/
+
+template<class ImageIn, class ImageOut>
+void Rgb2Gray(const ImageIn &imaIn, ImageOut *imaOut) {
+  // It is all fine to cnvert RGBA image here as well,
+  // all the additional channels will be nicely ignored.
+  assert(imaIn.Depth() >= 3);
+
+  imaOut->Resize(imaIn.Height(), imaIn.Width(), 1);
+  // Convert each RGB pixel into Gray value (luminance)
+
+  for (int j = 0; j < imaIn.Height(); ++j) {
+    for (int i = 0; i < imaIn.Width(); ++i)  {
+      (*imaOut)(j, i) = RGB2GRAY(imaIn(j, i, 0) , imaIn(j, i, 1), imaIn(j, i, 2));
+    }
+  }
+}
+
+// Convert given float image to an unsigned char array of pixels.
+template<class Image>
+unsigned char *FloatImageToUCharArray(const Image &image) {
+  unsigned char *buffer =
+      new unsigned char[image.Width() * image.Height() * image.Depth()];
+
+  for (int y = 0; y < image.Height(); y++) {
+    for (int x = 0; x < image.Width(); x++)  {
+      for (int d = 0; d < image.Depth(); d++)  {
+        int index = (y * image.Width() + x) * image.Depth() + d;
+        buffer[index] = 255.0 * image(y, x, d);
+      }
+    }
+  }
+
+  return buffer;
+}
+
+}  // namespace libmv
+
+#endif  // LIBMV_IMAGE_IMAGE_CONVERTER_H