diff --git a/components/maixcam_lib/include/maix_nn_maixcam.hpp b/components/maixcam_lib/include/maix_nn_maixcam.hpp
index 86857b6c..1b1d55f2 100644
--- a/components/maixcam_lib/include/maix_nn_maixcam.hpp
+++ b/components/maixcam_lib/include/maix_nn_maixcam.hpp
@@ -10,6 +10,7 @@ namespace maix::nn
     {
     public:
         NN_MaixCam(bool dual_buff);
+        NN_MaixCam();
         ~NN_MaixCam();
 
         /**
@@ -76,6 +77,7 @@ namespace maix::nn
         bool _loaded;
         void *_data;
         bool _enable_dual_buff;
+        void _init(bool dual_buff = true);
     };
 
 } // namespace maix::nn
diff --git a/components/maixcam_lib/lib/libmaixcam_lib.so b/components/maixcam_lib/lib/libmaixcam_lib.so
index 63035ff3..d2e2f624 100755
Binary files a/components/maixcam_lib/lib/libmaixcam_lib.so and b/components/maixcam_lib/lib/libmaixcam_lib.so differ