Supported multi-threading.

Added the code to render the binarized image in sub-thread.

Author: sonsongithub

cv.xcodeproj/project.pbxproj

@@ -266,8 +266,12 @@
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_OPTIMIZATION_LEVEL = 0;
-				GCC_PREPROCESSOR_DEFINITIONS = DEBUG;
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					DEBUG,
+					_DEBUG,
+				);
 				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
+				GCC_THUMB_SUPPORT = NO;
 				GCC_VERSION = com.apple.compilers.llvmgcc42;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
@@ -282,6 +286,8 @@
 				ARCHS = "$(ARCHS_STANDARD_32_BIT)";
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_OPTIMIZATION_LEVEL = 3;
+				GCC_THUMB_SUPPORT = NO;
 				GCC_VERSION = com.apple.compilers.llvmgcc42;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;