diff --git a/ext/opencv/cvbox2d.cpp b/ext/opencv/cvbox2d.cpp
index 235f40d..bf39e04 100644
--- a/ext/opencv/cvbox2d.cpp
+++ b/ext/opencv/cvbox2d.cpp
@@ -181,7 +181,7 @@ init_ruby_class()
   VALUE opencv = rb_module_opencv();
   rb_klass = rb_define_class_under(opencv, "CvBox2D", rb_cObject);
   rb_define_alloc_func(rb_klass, rb_allocate);
-  rb_define_private_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
+  rb_define_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
   rb_define_method(rb_klass, "center", RUBY_METHOD_FUNC(rb_center), 0);
   rb_define_method(rb_klass, "center=", RUBY_METHOD_FUNC(rb_set_center), 1);
   rb_define_method(rb_klass, "size", RUBY_METHOD_FUNC(rb_size), 0);
diff --git a/ext/opencv/cvchain.cpp b/ext/opencv/cvchain.cpp
index b1d2274..3ef1df6 100644
--- a/ext/opencv/cvchain.cpp
+++ b/ext/opencv/cvchain.cpp
@@ -38,7 +38,6 @@ rb_allocate(VALUE klass)
 
 /*
  * Create a new chain code
- * @scope class
  * @overload new(storage=nil)
  *   @param storage [CvMemStorage,nil] Sequence location (If storage is nil, allocates a new storage automatically)
  * @return [CvChain] New CvChain instance
@@ -221,7 +220,7 @@ init_ruby_class()
   rb_hash_aset(approx_chain_option, ID2SYM(rb_intern("minimal_perimeter")), INT2FIX(0));
   rb_hash_aset(approx_chain_option, ID2SYM(rb_intern("recursive")), Qfalse);
 
-  rb_define_private_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
+  rb_define_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
   rb_define_method(rb_klass, "origin", RUBY_METHOD_FUNC(rb_origin), 0);
   rb_define_method(rb_klass, "origin=", RUBY_METHOD_FUNC(rb_set_origin), 1);
   rb_define_method(rb_klass, "codes", RUBY_METHOD_FUNC(rb_codes), 0);
diff --git a/ext/opencv/cvconnectedcomp.cpp b/ext/opencv/cvconnectedcomp.cpp
index 0ec3d58..fb10309 100644
--- a/ext/opencv/cvconnectedcomp.cpp
+++ b/ext/opencv/cvconnectedcomp.cpp
@@ -144,7 +144,7 @@ init_ruby_class()
   
   rb_klass = rb_define_class_under(opencv, "CvConnectedComp", rb_cObject);
   rb_define_alloc_func(rb_klass, rb_allocate);
-  rb_define_private_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
+  rb_define_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
   rb_define_method(rb_klass, "area", RUBY_METHOD_FUNC(rb_area), 0);
   rb_define_method(rb_klass, "value", RUBY_METHOD_FUNC(rb_value), 0);
   rb_define_method(rb_klass, "rect", RUBY_METHOD_FUNC(rb_rect), 0);
diff --git a/ext/opencv/cvcontour.cpp b/ext/opencv/cvcontour.cpp
index 86a4a8b..f600204 100644
--- a/ext/opencv/cvcontour.cpp
+++ b/ext/opencv/cvcontour.cpp
@@ -313,7 +313,7 @@ init_ruby_class()
   rb_hash_aset(approx_option, ID2SYM(rb_intern("accuracy")), rb_float_new(1.0));
   rb_hash_aset(approx_option, ID2SYM(rb_intern("recursive")), Qfalse);
   
-  rb_define_private_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
+  rb_define_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
   rb_define_method(rb_klass, "rect", RUBY_METHOD_FUNC(rb_rect), 0);
   rb_define_method(rb_klass, "color", RUBY_METHOD_FUNC(rb_color), 0);
   rb_define_method(rb_klass, "color=", RUBY_METHOD_FUNC(rb_set_color), 1);
diff --git a/ext/opencv/cvfeaturetree.cpp b/ext/opencv/cvfeaturetree.cpp
index b2f6f70..a559e8b 100644
--- a/ext/opencv/cvfeaturetree.cpp
+++ b/ext/opencv/cvfeaturetree.cpp
@@ -113,7 +113,7 @@ init_ruby_class()
   VALUE opencv = rb_module_opencv();
   rb_klass = rb_define_class_under(opencv, "CvFeatureTree", rb_cObject);
   rb_define_alloc_func(rb_klass, rb_allocate);
-  rb_define_private_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), 1);
+  rb_define_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), 1);
 
   rb_define_method(rb_klass, "find_features", RUBY_METHOD_FUNC(rb_find_features), 3);
 }
diff --git a/ext/opencv/cvfont.cpp b/ext/opencv/cvfont.cpp
index 86eaf3e..05e9ab9 100644
--- a/ext/opencv/cvfont.cpp
+++ b/ext/opencv/cvfont.cpp
@@ -214,7 +214,7 @@ init_ruby_class()
   rb_hash_aset(default_option, ID2SYM(rb_intern("thickness")), INT2FIX(1));
   rb_hash_aset(default_option, ID2SYM(rb_intern("line_type")), INT2FIX(8));
   
-  rb_define_private_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
+  rb_define_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
   rb_define_method(rb_klass, "face", RUBY_METHOD_FUNC(rb_face), 0);
   rb_define_method(rb_klass, "hscale", RUBY_METHOD_FUNC(rb_hscale), 0);
   rb_define_method(rb_klass, "vscale", RUBY_METHOD_FUNC(rb_vscale), 0);
diff --git a/ext/opencv/cvhistogram.cpp b/ext/opencv/cvhistogram.cpp
index 599c2f5..20d7ef0 100644
--- a/ext/opencv/cvhistogram.cpp
+++ b/ext/opencv/cvhistogram.cpp
@@ -674,7 +674,7 @@ init_ruby_class()
   VALUE opencv = rb_module_opencv();
   rb_klass = rb_define_class_under(opencv, "CvHistogram", rb_cObject);
   rb_define_alloc_func(rb_klass, rb_allocate);
-  rb_define_private_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
+  rb_define_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
   rb_define_method(rb_klass, "is_uniform?", RUBY_METHOD_FUNC(rb_is_uniform), 0);
   rb_define_method(rb_klass, "is_sparse?", RUBY_METHOD_FUNC(rb_is_sparse), 0);
   rb_define_method(rb_klass, "has_range?", RUBY_METHOD_FUNC(rb_has_range), 0);
diff --git a/ext/opencv/cvmat.cpp b/ext/opencv/cvmat.cpp
index 8f03091..b46f6b9 100644
--- a/ext/opencv/cvmat.cpp
+++ b/ext/opencv/cvmat.cpp
@@ -162,7 +162,7 @@ void define_ruby_class()
   rb_hash_aset(find_fundamental_matrix_option, ID2SYM(rb_intern("maximum_distance")), rb_float_new(1.0));
   rb_hash_aset(find_fundamental_matrix_option, ID2SYM(rb_intern("desirable_level")), rb_float_new(0.99));
 
-  rb_define_private_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
+  rb_define_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
   rb_define_singleton_method(rb_klass, "load", RUBY_METHOD_FUNC(rb_load_imageM), -1);
   // Ruby/OpenCV original functions
   rb_define_method(rb_klass, "method_missing", RUBY_METHOD_FUNC(rb_method_missing), -1);
diff --git a/ext/opencv/cvmoments.cpp b/ext/opencv/cvmoments.cpp
index 2e4a2e8..1803e2f 100644
--- a/ext/opencv/cvmoments.cpp
+++ b/ext/opencv/cvmoments.cpp
@@ -44,7 +44,7 @@ define_ruby_class()
   
   rb_klass = rb_define_class_under(opencv, "CvMoments", rb_cObject);
   rb_define_alloc_func(rb_klass, rb_allocate);
-  rb_define_private_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
+  rb_define_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
   rb_define_method(rb_klass, "spatial", RUBY_METHOD_FUNC(rb_spatial), 2);
   rb_define_method(rb_klass, "central", RUBY_METHOD_FUNC(rb_central), 2);
   rb_define_method(rb_klass, "normalized_central", RUBY_METHOD_FUNC(rb_normalized_central), 2);
diff --git a/ext/opencv/cvpoint.cpp b/ext/opencv/cvpoint.cpp
index 511c427..4d36d20 100644
--- a/ext/opencv/cvpoint.cpp
+++ b/ext/opencv/cvpoint.cpp
@@ -46,7 +46,7 @@ define_ruby_class()
   rb_klass = rb_define_class_under(opencv, "CvPoint", rb_cObject);
   rb_define_alloc_func(rb_klass, rb_allocate);
   rb_define_singleton_method(rb_klass, "compatible?", RUBY_METHOD_FUNC(rb_compatible_q), 1);
-  rb_define_private_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
+  rb_define_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
   rb_define_method(rb_klass, "x", RUBY_METHOD_FUNC(rb_x), 0);
   rb_define_method(rb_klass, "x=", RUBY_METHOD_FUNC(rb_set_x), 1);
   rb_define_method(rb_klass, "y", RUBY_METHOD_FUNC(rb_y), 0);
diff --git a/ext/opencv/cvpoint2d32f.cpp b/ext/opencv/cvpoint2d32f.cpp
index b2ce550..21d32e6 100644
--- a/ext/opencv/cvpoint2d32f.cpp
+++ b/ext/opencv/cvpoint2d32f.cpp
@@ -46,7 +46,7 @@ define_ruby_class()
   rb_klass = rb_define_class_under(opencv, "CvPoint2D32f", rb_cObject);
   rb_define_alloc_func(rb_klass, rb_allocate);
   rb_define_singleton_method(rb_klass, "compatible?", RUBY_METHOD_FUNC(rb_compatible_q), 1);
-  rb_define_private_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
+  rb_define_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
   rb_define_method(rb_klass, "x", RUBY_METHOD_FUNC(rb_x), 0);
   rb_define_method(rb_klass, "x=", RUBY_METHOD_FUNC(rb_set_x), 1);
   rb_define_method(rb_klass, "y", RUBY_METHOD_FUNC(rb_y), 0);
diff --git a/ext/opencv/cvpoint3d32f.cpp b/ext/opencv/cvpoint3d32f.cpp
index 117fefe..42ab76d 100644
--- a/ext/opencv/cvpoint3d32f.cpp
+++ b/ext/opencv/cvpoint3d32f.cpp
@@ -48,7 +48,7 @@ define_ruby_class()
   rb_klass = rb_define_class_under(opencv, "CvPoint3D32f", cvpoint2d32f);
   rb_define_alloc_func(rb_klass, rb_allocate);
   rb_define_singleton_method(rb_klass, "compatible?", RUBY_METHOD_FUNC(rb_compatible_q), 1);
-  rb_define_private_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
+  rb_define_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
   rb_define_method(rb_klass, "x", RUBY_METHOD_FUNC(rb_x), 0);
   rb_define_method(rb_klass, "x=", RUBY_METHOD_FUNC(rb_set_x), 1);
   rb_define_method(rb_klass, "y", RUBY_METHOD_FUNC(rb_y), 0);
diff --git a/ext/opencv/cvrect.cpp b/ext/opencv/cvrect.cpp
index 9dfc106..4b70718 100644
--- a/ext/opencv/cvrect.cpp
+++ b/ext/opencv/cvrect.cpp
@@ -49,7 +49,7 @@ define_ruby_class()
   rb_define_alloc_func(rb_klass, rb_allocate);
   rb_define_singleton_method(rb_klass, "compatible?", RUBY_METHOD_FUNC(rb_compatible_q), 1);
   rb_define_singleton_method(rb_klass, "max_rect", RUBY_METHOD_FUNC(rb_max_rect), 2);
-  rb_define_private_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
+  rb_define_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
 
   rb_define_method(rb_klass, "x", RUBY_METHOD_FUNC(rb_x), 0);
   rb_define_method(rb_klass, "x=", RUBY_METHOD_FUNC(rb_set_x), 1);
diff --git a/ext/opencv/cvscalar.cpp b/ext/opencv/cvscalar.cpp
index f81910b..6c7867d 100644
--- a/ext/opencv/cvscalar.cpp
+++ b/ext/opencv/cvscalar.cpp
@@ -58,7 +58,7 @@ define_ruby_class()
   /* CvScalar: class */
   rb_define_const(opencv, "CvColor", rb_klass);
   rb_define_alloc_func(rb_klass, rb_allocate);      
-  rb_define_private_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
+  rb_define_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
   rb_define_method(rb_klass, "[]", RUBY_METHOD_FUNC(rb_aref), 1);
   rb_define_method(rb_klass, "[]=", RUBY_METHOD_FUNC(rb_aset), 2);
   rb_define_method(rb_klass, "sub", RUBY_METHOD_FUNC(rb_sub), -1);
diff --git a/ext/opencv/cvseq.cpp b/ext/opencv/cvseq.cpp
index 28fcdc4..28645f0 100644
--- a/ext/opencv/cvseq.cpp
+++ b/ext/opencv/cvseq.cpp
@@ -87,7 +87,7 @@ define_ruby_class()
   rb_klass = rb_define_class_under(opencv, "CvSeq", rb_cObject);
   rb_include_module(rb_klass, rb_mEnumerable);
   rb_define_alloc_func(rb_klass, rb_allocate);
-  rb_define_private_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
+  rb_define_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
   rb_define_method(rb_klass, "total", RUBY_METHOD_FUNC(rb_total), 0);
   rb_define_alias(rb_klass, "length", "total");
   rb_define_alias(rb_klass, "size", "total");
diff --git a/ext/opencv/cvsize.cpp b/ext/opencv/cvsize.cpp
index eb8e217..c3675dc 100644
--- a/ext/opencv/cvsize.cpp
+++ b/ext/opencv/cvsize.cpp
@@ -46,7 +46,7 @@ define_ruby_class()
   rb_klass = rb_define_class_under(opencv, "CvSize", rb_cObject);
   rb_define_alloc_func(rb_klass, rb_allocate);
   rb_define_singleton_method(rb_klass, "compatible?", RUBY_METHOD_FUNC(rb_compatible_q), 1);
-  rb_define_private_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
+  rb_define_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
   rb_define_method(rb_klass, "width", RUBY_METHOD_FUNC(rb_width), 0);
   rb_define_method(rb_klass, "width=", RUBY_METHOD_FUNC(rb_set_width), 1);
   rb_define_method(rb_klass, "height", RUBY_METHOD_FUNC(rb_height), 0);
diff --git a/ext/opencv/cvsize2d32f.cpp b/ext/opencv/cvsize2d32f.cpp
index 1e1c70b..c645bdd 100644
--- a/ext/opencv/cvsize2d32f.cpp
+++ b/ext/opencv/cvsize2d32f.cpp
@@ -46,7 +46,7 @@ define_ruby_class()
   rb_klass = rb_define_class_under(opencv, "CvSize2D32f", rb_cObject);
   rb_define_alloc_func(rb_klass, rb_allocate);
   rb_define_singleton_method(rb_klass, "compatible?", RUBY_METHOD_FUNC(rb_compatible_q), 1);
-  rb_define_private_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
+  rb_define_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
   rb_define_method(rb_klass, "width", RUBY_METHOD_FUNC(rb_width), 0);
   rb_define_method(rb_klass, "width=", RUBY_METHOD_FUNC(rb_set_width), 1);
   rb_define_method(rb_klass, "height", RUBY_METHOD_FUNC(rb_height), 0);
diff --git a/ext/opencv/cvslice.cpp b/ext/opencv/cvslice.cpp
index 8e9088c..cbed2fa 100644
--- a/ext/opencv/cvslice.cpp
+++ b/ext/opencv/cvslice.cpp
@@ -41,7 +41,7 @@ define_ruby_class()
   VALUE opencv = rb_module_opencv();
   rb_klass = rb_define_class_under(opencv, "CvSlice", rb_cObject);
   rb_define_alloc_func(rb_klass, rb_allocate);
-  rb_define_private_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), 2);
+  rb_define_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), 2);
   rb_define_method(rb_klass, "start_index", RUBY_METHOD_FUNC(rb_start_index_aref), 0);
   rb_define_method(rb_klass, "end_index", RUBY_METHOD_FUNC(rb_end_index_aref), 0);
   rb_define_method(rb_klass, "start_index=", RUBY_METHOD_FUNC(rb_start_index_aset), 1);
diff --git a/ext/opencv/cvsurfparams.cpp b/ext/opencv/cvsurfparams.cpp
index a493d54..382748d 100644
--- a/ext/opencv/cvsurfparams.cpp
+++ b/ext/opencv/cvsurfparams.cpp
@@ -43,7 +43,7 @@ define_ruby_class()
   VALUE opencv = rb_module_opencv();
   rb_klass = rb_define_class_under(opencv, "CvSURFParams", rb_cObject);
   rb_define_alloc_func(rb_klass, rb_allocate);
-  rb_define_private_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
+  rb_define_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
   rb_define_method(rb_klass, "hessian_threshold", RUBY_METHOD_FUNC(rb_get_hessian_threshold), 0);
   rb_define_method(rb_klass, "hessian_threshold=", RUBY_METHOD_FUNC(rb_set_hessian_threshold), 1);
   rb_define_method(rb_klass, "extended", RUBY_METHOD_FUNC(rb_get_extended), 0);
diff --git a/ext/opencv/cvsurfpoint.cpp b/ext/opencv/cvsurfpoint.cpp
index 84bca7e..4eebab3 100644
--- a/ext/opencv/cvsurfpoint.cpp
+++ b/ext/opencv/cvsurfpoint.cpp
@@ -48,7 +48,7 @@ define_ruby_class()
   VALUE opencv = rb_module_opencv();
   rb_klass = rb_define_class_under(opencv, "CvSURFPoint", rb_cObject);
   rb_define_alloc_func(rb_klass, rb_allocate);
-  rb_define_private_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), 5);
+  rb_define_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), 5);
   rb_define_method(rb_klass, "pt", RUBY_METHOD_FUNC(rb_get_pt), 0);
   rb_define_method(rb_klass, "pt=", RUBY_METHOD_FUNC(rb_set_pt), 1);
   rb_define_method(rb_klass, "laplacian", RUBY_METHOD_FUNC(rb_get_laplacian), 0);
diff --git a/ext/opencv/cvtermcriteria.cpp b/ext/opencv/cvtermcriteria.cpp
index 60fa83b..e86df34 100644
--- a/ext/opencv/cvtermcriteria.cpp
+++ b/ext/opencv/cvtermcriteria.cpp
@@ -45,7 +45,7 @@ define_ruby_class()
   /* CvTermCriteria: class */
   rb_define_const(opencv, "CvTerm", rb_klass);
   rb_define_alloc_func(rb_klass, rb_allocate);
-  rb_define_private_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
+  rb_define_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
   rb_define_method(rb_klass, "type", RUBY_METHOD_FUNC(rb_type), 0);
   rb_define_method(rb_klass, "max", RUBY_METHOD_FUNC(rb_max), 0);
   rb_define_method(rb_klass, "max=", RUBY_METHOD_FUNC(rb_set_max), 1);
diff --git a/ext/opencv/cvvideowriter.cpp b/ext/opencv/cvvideowriter.cpp
index a1f0d9a..0059739 100644
--- a/ext/opencv/cvvideowriter.cpp
+++ b/ext/opencv/cvvideowriter.cpp
@@ -38,7 +38,7 @@ define_ruby_class()
    */
   VALUE opencv = rb_module_opencv();
   rb_klass = rb_define_class_under(opencv, "CvVideoWriter", rb_cObject);
-  rb_define_private_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
+  rb_define_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
   rb_define_method(rb_klass, "write", RUBY_METHOD_FUNC(rb_write), 1);
   rb_define_method(rb_klass, "close", RUBY_METHOD_FUNC(rb_close), 0);
 }
diff --git a/ext/opencv/iplconvkernel.cpp b/ext/opencv/iplconvkernel.cpp
index bcedb96..4343a74 100644
--- a/ext/opencv/iplconvkernel.cpp
+++ b/ext/opencv/iplconvkernel.cpp
@@ -43,7 +43,7 @@ define_ruby_class()
   rb_klass = rb_define_class_under(opencv, "IplConvKernel", rb_cObject);
   rb_define_alloc_func(rb_klass, rb_allocate);
 
-  rb_define_private_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
+  rb_define_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
   rb_define_method(rb_klass, "size", RUBY_METHOD_FUNC(rb_size), 0);
   rb_define_method(rb_klass, "cols", RUBY_METHOD_FUNC(rb_cols), 0);
   rb_define_alias(rb_klass, "columns", "cols");
diff --git a/ext/opencv/iplimage.cpp b/ext/opencv/iplimage.cpp
index 3ccd4a0..5b7a959 100644
--- a/ext/opencv/iplimage.cpp
+++ b/ext/opencv/iplimage.cpp
@@ -49,7 +49,7 @@ define_ruby_class()
   rb_klass = rb_define_class_under(opencv, "IplImage", cvmat);
   rb_define_alloc_func(rb_klass, rb_allocate);
   rb_define_singleton_method(rb_klass, "load", RUBY_METHOD_FUNC(rb_load_image), -1);
-  rb_define_private_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1); 
+  rb_define_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1); 
   rb_define_method(rb_klass, "get_roi", RUBY_METHOD_FUNC(rb_get_roi), 0);
   rb_define_alias(rb_klass, "roi", "get_roi");
   rb_define_method(rb_klass, "set_roi", RUBY_METHOD_FUNC(rb_set_roi), 1);
diff --git a/ext/opencv/trackbar.cpp b/ext/opencv/trackbar.cpp
index 183cd3c..b1f3d15 100644
--- a/ext/opencv/trackbar.cpp
+++ b/ext/opencv/trackbar.cpp
@@ -37,7 +37,7 @@ void define_ruby_class() {
   VALUE GUI = rb_module_GUI();
   rb_klass = rb_define_class_under(GUI, "Trackbar", rb_cObject);
   rb_define_alloc_func(rb_klass, rb_allocate);
-  rb_define_private_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
+  rb_define_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
   rb_define_method(rb_klass, "name", RUBY_METHOD_FUNC(rb_name), 0);
   rb_define_method(rb_klass, "max", RUBY_METHOD_FUNC(rb_max), 0);
   rb_define_method(rb_klass, "value", RUBY_METHOD_FUNC(rb_value), 0);
diff --git a/ext/opencv/window.cpp b/ext/opencv/window.cpp
index 8c01626..c233e63 100644
--- a/ext/opencv/window.cpp
+++ b/ext/opencv/window.cpp
@@ -46,7 +46,7 @@ define_ruby_class()
   VALUE GUI = rb_module_GUI();
   rb_klass = rb_define_class_under(GUI, "Window", rb_cObject);
   rb_define_alloc_func(rb_klass, rb_allocate);
-  rb_define_private_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
+  rb_define_method(rb_klass, "initialize", RUBY_METHOD_FUNC(rb_initialize), -1);
   rb_define_method(rb_klass, "alive?", RUBY_METHOD_FUNC(rb_alive_q), 0);
   rb_define_method(rb_klass, "destroy", RUBY_METHOD_FUNC(rb_destroy), 0);
   rb_define_singleton_method(rb_klass, "destroy_all", RUBY_METHOD_FUNC(rb_destroy_all), 0);