diff --git a/ext/opencv/cvmat.cpp b/ext/opencv/cvmat.cpp
index beec799..a2075a5 100644
--- a/ext/opencv/cvmat.cpp
+++ b/ext/opencv/cvmat.cpp
@@ -45,11 +45,6 @@
 __NAMESPACE_BEGIN_OPENCV
 __NAMESPACE_BEGIN_CVMAT
 
-#define SUPPORT_8UC1_ONLY(value) if (cvGetElemType(CVARR(value)) != CV_8UC1) {rb_raise(rb_eNotImpError, "support single-channel 8bit unsigned image only.");}
-#define SUPPORT_8U_ONLY(value) if (CV_MAT_DEPTH(cvGetElemType(CVARR(value))) != CV_8U) {rb_raise(rb_eNotImpError, "support 8bit unsigned image only.");}
-#define SUPPORT_C1_ONLY(value) if (CV_MAT_CN(cvGetElemType(CVARR(value))) != 1) {rb_raise(rb_eNotImpError, "support single-channel image only.");}
-#define SUPPORT_C1C3_ONLY(value) if (CV_MAT_CN(cvGetElemType(CVARR(value))) != 1 && CV_MAT_CN(cvGetElemType(CVARR(value))) != 3) {rb_raise(rb_eNotImpError, "support single-channel or 3-channnel image only.");}
-
 #define DRAWING_OPTION(op) NIL_P(op) ? rb_const_get(rb_class(), rb_intern("DRAWING_OPTION")) : rb_funcall(rb_const_get(rb_class(), rb_intern("DRAWING_OPTION")), rb_intern("merge"), 1, op)
 #define DO_COLOR(op) VALUE_TO_CVSCALAR(rb_hash_aref(op, ID2SYM(rb_intern("color"))))
 #define DO_THICKNESS(op) FIX2INT(rb_hash_aref(op, ID2SYM(rb_intern("thickness"))))
diff --git a/ext/opencv/opencv.h b/ext/opencv/opencv.h
index 54fffd9..3397489 100644
--- a/ext/opencv/opencv.h
+++ b/ext/opencv/opencv.h
@@ -238,16 +238,6 @@ REFER_OBJECT(VALUE klass, void *ptr, VALUE root)
   return Data_Wrap_Struct(klass, mark_root_object, unregister_object, ptr);
 }
 
-inline VALUE
-CONVERT(VALUE object, VALUE klass)
-{
-  VALUE method_name = rb_str_concat(rb_str_new2("from_"), rb_str_new2(rb_obj_classname(object)));
-  VALUE result = rb_funcall(klass, rb_intern(StringValueCStr(method_name)), 1, object);
-  if(CLASS_OF(result) != klass)
-    rb_raise(rb_eTypeError, "require %s, but return %s.", rb_class2name(klass), rb_class2name(CLASS_OF(result)));
-  return result;
-}
-
 inline int
 CVMETHOD(const char *name, VALUE method, int ifnone = 0)
 {
@@ -391,55 +381,4 @@ VALUE rb_HLS2RGB(VALUE klass, VALUE image);
 
 __NAMESPACE_END_OPENCV
 
-inline VALUE
-extract_options_from_args_bang(VALUE ary)
-{
-  return (RARRAY_LEN(ary) > 0 && rb_obj_is_kind_of(RARRAY_PTR(ary)[RARRAY_LEN(ary) -1], rb_cHash)) ? rb_ary_pop(ary) : rb_hash_new();
-}
-
-/*
-  inline VALUE
-  assert_valid_keys(VALUE keys, VALUE valid_keys)
-  {
-  VALUE unknown_keys = rb_funcall(keys, rb_intern("-"), 1, rb_funcall(valid_keys, rb_intern("flatten"), 0));
-  if (NUM2INT(rb_funcall(unknown_keys, rb_intern("empty?"), 0)) != 0){
-  rb_raise(rb_eArgError, "Unknown key(s): %s",
-  RSTRING_PTR(rb_funcall(unknown_keys, rb_intern("join"), 1, rb_str_new2(", "))));
-  }
-  return Qnil;  
-  }
-*/
-/*
-  inline void
-  assert_valid_keys(VALUE options, int n, ...){
-  va_list valid_keys;  
-  if (!(n > 0)) {return;}
-  VALUE unknown_keys = rb_funcall(options, rb_intern("keys"), 0);
-  va_start(valid_keys, n);
-  for (int i = 0; i < n; i++)
-  rb_ary_delete(unknown_keys, ID2SYM(rb_intern(va_arg(valid_keys, char*))));
-  if (RARRAY_LEN(unknown_keys) > 0)
-  rb_raise(rb_eArgError, "Unknown key(s): %s",
-  RSTRING_PTR(rb_funcall(unknown_keys, rb_intern("join"), 1, rb_str_new2(", "))));
-  va_end(valid_keys);
-  }
-
-  inline VALUE
-  validate_option(VALUE options, const *char key, char *ifnone, int n, ...){
-  va_list valid_values;
-  VALUE value = rb_hash_aref(options, ID2SYM(rb_intern(key)));
-  if (!value || !(n > 0)) {return ifnone;}
-  va_start(valid_values, n); 
-  for (int i = 0; i < n; i++){    
-  if (!strcmp(StringValueCStr(value), va_arg(valid_values, char*))){
-  rb_warn("Option :%s value :%s does not defined. Default value :%s is used.", StringValueCStr(value), );
-  return ifnone;
-  }
-  }
-  va_end(valid_values);
-  return value;
-  }
-
-  #define OPTIONS(value, hash, key, default) value = ((value = rb_hash_aref(hash, ID2SYM(rb_intern(key)))) ? value : default)
-*/
 #endif // RUBY_OPENCV_H