New sample for CUDA on Android added.
authorAlexander Smorkalov <alexander.smorkalov@itseez.com>
Mon, 23 Dec 2013 11:20:09 +0000 (15:20 +0400)
committerAlexander Smorkalov <alexander.smorkalov@itseez.com>
Thu, 26 Dec 2013 10:52:41 +0000 (14:52 +0400)
14 files changed:
samples/android/CMakeLists.txt
samples/android/tutorial-4-cuda/.classpath [new file with mode: 0644]
samples/android/tutorial-4-cuda/.cproject [new file with mode: 0644]
samples/android/tutorial-4-cuda/.project [new file with mode: 0644]
samples/android/tutorial-4-cuda/.settings/org.eclipse.jdt.core.prefs [new file with mode: 0644]
samples/android/tutorial-4-cuda/AndroidManifest.xml [new file with mode: 0644]
samples/android/tutorial-4-cuda/CMakeLists.txt [new file with mode: 0644]
samples/android/tutorial-4-cuda/jni/Android.mk [new file with mode: 0644]
samples/android/tutorial-4-cuda/jni/Application.mk [new file with mode: 0644]
samples/android/tutorial-4-cuda/jni/jni_part.cpp [new file with mode: 0644]
samples/android/tutorial-4-cuda/res/drawable/icon.png [new file with mode: 0644]
samples/android/tutorial-4-cuda/res/layout/tutorial4_surface_view.xml [new file with mode: 0644]
samples/android/tutorial-4-cuda/res/values/strings.xml [new file with mode: 0644]
samples/android/tutorial-4-cuda/src/org/opencv/samples/tutorial4/Tutorial4Activity.java [new file with mode: 0644]

index 0dc4a3c..d938580 100644 (file)
@@ -15,6 +15,10 @@ add_subdirectory(tutorial-1-camerapreview)
 add_subdirectory(tutorial-2-mixedprocessing)
 add_subdirectory(tutorial-3-cameracontrol)
 
+if (HAVE_opencv_gpu)
+  add_subdirectory(tutorial-4-cuda)
+endif()
+
 add_subdirectory(native-activity)
 
 # hello-android sample
diff --git a/samples/android/tutorial-4-cuda/.classpath b/samples/android/tutorial-4-cuda/.classpath
new file mode 100644 (file)
index 0000000..3f9691c
--- /dev/null
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+       <classpathentry kind="con" path="com.android.ide.eclipse.adt.ANDROID_FRAMEWORK"/>
+       <classpathentry kind="con" path="com.android.ide.eclipse.adt.LIBRARIES"/>
+       <classpathentry kind="src" path="src"/>
+       <classpathentry kind="src" path="gen"/>
+       <classpathentry kind="output" path="bin/classes"/>
+</classpath>
diff --git a/samples/android/tutorial-4-cuda/.cproject b/samples/android/tutorial-4-cuda/.cproject
new file mode 100644 (file)
index 0000000..80a5051
--- /dev/null
@@ -0,0 +1,76 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<?fileVersion 4.0.0?>
+
+<cproject storage_type_id="org.eclipse.cdt.core.XmlProjectDescriptionStorage">
+       <storageModule moduleId="org.eclipse.cdt.core.settings">
+               <cconfiguration id="0.1227367918">
+                       <storageModule buildSystemId="org.eclipse.cdt.managedbuilder.core.configurationDataProvider" id="0.1227367918" moduleId="org.eclipse.cdt.core.settings" name="Default">
+                               <externalSettings/>
+                               <extensions>
+                                       <extension id="org.eclipse.cdt.core.VCErrorParser" point="org.eclipse.cdt.core.ErrorParser"/>
+                                       <extension id="org.eclipse.cdt.core.GmakeErrorParser" point="org.eclipse.cdt.core.ErrorParser"/>
+                                       <extension id="org.eclipse.cdt.core.CWDLocator" point="org.eclipse.cdt.core.ErrorParser"/>
+                                       <extension id="org.eclipse.cdt.core.GCCErrorParser" point="org.eclipse.cdt.core.ErrorParser"/>
+                                       <extension id="org.eclipse.cdt.core.GASErrorParser" point="org.eclipse.cdt.core.ErrorParser"/>
+                                       <extension id="org.eclipse.cdt.core.GLDErrorParser" point="org.eclipse.cdt.core.ErrorParser"/>
+                               </extensions>
+                       </storageModule>
+                       <storageModule moduleId="cdtBuildSystem" version="4.0.0">
+                               <configuration artifactName="${ProjName}" buildProperties="" description="" id="0.1227367918" name="Default" parent="org.eclipse.cdt.build.core.prefbase.cfg">
+                                       <folderInfo id="0.1227367918." name="/" resourcePath="">
+                                               <toolChain id="org.eclipse.cdt.build.core.prefbase.toolchain.1817556292" name="No ToolChain" resourceTypeBasedDiscovery="false" superClass="org.eclipse.cdt.build.core.prefbase.toolchain">
+                                                       <targetPlatform id="org.eclipse.cdt.build.core.prefbase.toolchain.1817556292.437475188" name=""/>
+                                                       <builder autoBuildTarget="" command="${NDKROOT}/ndk-build.cmd" enableAutoBuild="true" enableCleanBuild="false" id="org.eclipse.cdt.build.core.settings.default.builder.141883337" incrementalBuildTarget="" keepEnvironmentInBuildfile="false" managedBuildOn="false" name="Gnu Make Builder" superClass="org.eclipse.cdt.build.core.settings.default.builder"/>
+                                                       <tool id="org.eclipse.cdt.build.core.settings.holder.libs.914869649" name="holder for library settings" superClass="org.eclipse.cdt.build.core.settings.holder.libs"/>
+                                                       <tool id="org.eclipse.cdt.build.core.settings.holder.1504728878" name="Assembly" superClass="org.eclipse.cdt.build.core.settings.holder">
+                                                               <inputType id="org.eclipse.cdt.build.core.settings.holder.inType.1470189286" languageId="org.eclipse.cdt.core.assembly" languageName="Assembly" sourceContentType="org.eclipse.cdt.core.asmSource" superClass="org.eclipse.cdt.build.core.settings.holder.inType"/>
+                                                       </tool>
+                                                       <tool id="org.eclipse.cdt.build.core.settings.holder.260316541" name="GNU C++" superClass="org.eclipse.cdt.build.core.settings.holder">
+                                                               <option id="org.eclipse.cdt.build.core.settings.holder.symbols.892620793" superClass="org.eclipse.cdt.build.core.settings.holder.symbols" valueType="definedSymbols">
+                                                                       <listOptionValue builtIn="false" value="ANDROID=1"/>
+                                                               </option>
+                                                               <option id="org.eclipse.cdt.build.core.settings.holder.incpaths.1772035264" superClass="org.eclipse.cdt.build.core.settings.holder.incpaths" valueType="includePath">
+                                                                       <listOptionValue builtIn="false" value="&quot;${NDKROOT}/platforms/android-9/arch-arm/usr/include&quot;"/>
+                                                                       <listOptionValue builtIn="false" value="&quot;${NDKROOT}/sources/cxx-stl/gnu-libstdc++/4.6/include&quot;"/>
+                                                                       <listOptionValue builtIn="false" value="&quot;${NDKROOT}/sources/cxx-stl/gnu-libstdc++/4.6/libs/armeabi-v7a/include&quot;"/>
+                                                                       <listOptionValue builtIn="false" value="&quot;${CUDA_TOOLKIT_ROOT}/include&quot;"/>
+                                                                       <listOptionValue builtIn="false" value="&quot;${ProjDirPath}/../../sdk/native/jni/include&quot;"/>
+                                                               </option>
+                                                               <inputType id="org.eclipse.cdt.build.core.settings.holder.inType.159439464" languageId="org.eclipse.cdt.core.g++" languageName="GNU C++" sourceContentType="org.eclipse.cdt.core.cxxSource,org.eclipse.cdt.core.cxxHeader" superClass="org.eclipse.cdt.build.core.settings.holder.inType"/>
+                                                       </tool>
+                                                       <tool id="org.eclipse.cdt.build.core.settings.holder.1147885196" name="GNU C" superClass="org.eclipse.cdt.build.core.settings.holder">
+                                                               <option id="org.eclipse.cdt.build.core.settings.holder.symbols.1153621931" superClass="org.eclipse.cdt.build.core.settings.holder.symbols" valueType="definedSymbols">
+                                                                       <listOptionValue builtIn="false" value="ANDROID=1"/>
+                                                               </option>
+                                                               <option id="org.eclipse.cdt.build.core.settings.holder.incpaths.1841493632" superClass="org.eclipse.cdt.build.core.settings.holder.incpaths" valueType="includePath">
+                                                                       <listOptionValue builtIn="false" value="&quot;${NDKROOT}/platforms/android-9/arch-arm/usr/include&quot;"/>
+                                                                       <listOptionValue builtIn="false" value="&quot;${NDKROOT}/sources/cxx-stl/gnu-libstdc++/4.6/include&quot;"/>
+                                                                       <listOptionValue builtIn="false" value="&quot;${NDKROOT}/sources/cxx-stl/gnu-libstdc++/4.6/libs/armeabi-v7a/include&quot;"/>
+                                                                       <listOptionValue builtIn="false" value="&quot;${CUDA_TOOLKIT_ROOT}/include&quot;"/>
+                                                                       <listOptionValue builtIn="false" value="&quot;${ProjDirPath}/../../sdk/native/jni/include&quot;"/>
+                                                               </option>
+                                                               <inputType id="org.eclipse.cdt.build.core.settings.holder.inType.608739504" languageId="org.eclipse.cdt.core.gcc" languageName="GNU C" sourceContentType="org.eclipse.cdt.core.cSource,org.eclipse.cdt.core.cHeader" superClass="org.eclipse.cdt.build.core.settings.holder.inType"/>
+                                                       </tool>
+                                               </toolChain>
+                                       </folderInfo>
+                                       <sourceEntries>
+                                               <entry flags="VALUE_WORKSPACE_PATH" kind="sourcePath" name="jni"/>
+                                       </sourceEntries>
+                               </configuration>
+                       </storageModule>
+                       <storageModule moduleId="org.eclipse.cdt.core.externalSettings"/>
+               </cconfiguration>
+       </storageModule>
+       <storageModule moduleId="cdtBuildSystem" version="4.0.0">
+               <project id="OpenCV Tutorial 4 - CUDA OpenCV.null.1819504790" name="OpenCV Tutorial 4 - CUDA"/>
+       </storageModule>
+       <storageModule moduleId="scannerConfiguration">
+               <autodiscovery enabled="true" problemReportingEnabled="true" selectedProfileId=""/>
+               <scannerConfigBuildInfo instanceId="0.1227367918">
+                       <autodiscovery enabled="true" problemReportingEnabled="true" selectedProfileId=""/>
+               </scannerConfigBuildInfo>
+       </storageModule>
+       <storageModule moduleId="refreshScope" versionNumber="1">
+               <resource resourceType="PROJECT" workspacePath="/OpenCV Tutorial 4 - CUDA"/>
+       </storageModule>
+</cproject>
diff --git a/samples/android/tutorial-4-cuda/.project b/samples/android/tutorial-4-cuda/.project
new file mode 100644 (file)
index 0000000..6366dfb
--- /dev/null
@@ -0,0 +1,101 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+       <name>OpenCV Tutorial 4 - CUDA</name>
+       <comment></comment>
+       <projects>
+       </projects>
+       <buildSpec>
+               <buildCommand>
+                       <name>org.eclipse.cdt.managedbuilder.core.genmakebuilder</name>
+                       <triggers>auto,full,incremental,</triggers>
+                       <arguments>
+                               <dictionary>
+                                       <key>?name?</key>
+                                       <value></value>
+                               </dictionary>
+                               <dictionary>
+                                       <key>org.eclipse.cdt.make.core.append_environment</key>
+                                       <value>true</value>
+                               </dictionary>
+                               <dictionary>
+                                       <key>org.eclipse.cdt.make.core.autoBuildTarget</key>
+                                       <value></value>
+                               </dictionary>
+                               <dictionary>
+                                       <key>org.eclipse.cdt.make.core.buildArguments</key>
+                                       <value></value>
+                               </dictionary>
+                               <dictionary>
+                                       <key>org.eclipse.cdt.make.core.buildCommand</key>
+                                       <value>${NDKROOT}/ndk-build.cmd</value>
+                               </dictionary>
+                               <dictionary>
+                                       <key>org.eclipse.cdt.make.core.cleanBuildTarget</key>
+                                       <value>clean</value>
+                               </dictionary>
+                               <dictionary>
+                                       <key>org.eclipse.cdt.make.core.contents</key>
+                                       <value>org.eclipse.cdt.make.core.activeConfigSettings</value>
+                               </dictionary>
+                               <dictionary>
+                                       <key>org.eclipse.cdt.make.core.enableAutoBuild</key>
+                                       <value>true</value>
+                               </dictionary>
+                               <dictionary>
+                                       <key>org.eclipse.cdt.make.core.enableCleanBuild</key>
+                                       <value>false</value>
+                               </dictionary>
+                               <dictionary>
+                                       <key>org.eclipse.cdt.make.core.enableFullBuild</key>
+                                       <value>true</value>
+                               </dictionary>
+                               <dictionary>
+                                       <key>org.eclipse.cdt.make.core.fullBuildTarget</key>
+                                       <value></value>
+                               </dictionary>
+                               <dictionary>
+                                       <key>org.eclipse.cdt.make.core.stopOnError</key>
+                                       <value>true</value>
+                               </dictionary>
+                               <dictionary>
+                                       <key>org.eclipse.cdt.make.core.useDefaultBuildCmd</key>
+                                       <value>false</value>
+                               </dictionary>
+                       </arguments>
+               </buildCommand>
+               <buildCommand>
+                       <name>com.android.ide.eclipse.adt.ResourceManagerBuilder</name>
+                       <arguments>
+                       </arguments>
+               </buildCommand>
+               <buildCommand>
+                       <name>com.android.ide.eclipse.adt.PreCompilerBuilder</name>
+                       <arguments>
+                       </arguments>
+               </buildCommand>
+               <buildCommand>
+                       <name>org.eclipse.jdt.core.javabuilder</name>
+                       <arguments>
+                       </arguments>
+               </buildCommand>
+               <buildCommand>
+                       <name>com.android.ide.eclipse.adt.ApkBuilder</name>
+                       <arguments>
+                       </arguments>
+               </buildCommand>
+               <buildCommand>
+                       <name>org.eclipse.cdt.managedbuilder.core.ScannerConfigBuilder</name>
+                       <triggers>full,incremental,</triggers>
+                       <arguments>
+                       </arguments>
+               </buildCommand>
+       </buildSpec>
+       <natures>
+               <nature>com.android.ide.eclipse.adt.AndroidNature</nature>
+               <nature>org.eclipse.jdt.core.javanature</nature>
+               <nature>org.eclipse.cdt.core.cnature</nature>
+               <nature>org.eclipse.cdt.core.ccnature</nature>
+               <nature>org.eclipse.cdt.managedbuilder.core.managedBuildNature</nature>
+               <nature>org.eclipse.cdt.managedbuilder.core.ScannerConfigNature</nature>
+       </natures>
+</projectDescription>
diff --git a/samples/android/tutorial-4-cuda/.settings/org.eclipse.jdt.core.prefs b/samples/android/tutorial-4-cuda/.settings/org.eclipse.jdt.core.prefs
new file mode 100644 (file)
index 0000000..b080d2d
--- /dev/null
@@ -0,0 +1,4 @@
+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.6
+org.eclipse.jdt.core.compiler.compliance=1.6
+org.eclipse.jdt.core.compiler.source=1.6
diff --git a/samples/android/tutorial-4-cuda/AndroidManifest.xml b/samples/android/tutorial-4-cuda/AndroidManifest.xml
new file mode 100644 (file)
index 0000000..7c8bb0d
--- /dev/null
@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          package="org.opencv.samples.tutorial4"
+          android:versionCode="21"
+          android:versionName="2.1">
+
+    <application
+        android:label="@string/app_name"
+        android:icon="@drawable/icon"
+        android:theme="@android:style/Theme.NoTitleBar.Fullscreen" >
+
+        <activity android:name="Tutorial4Activity"
+                  android:label="@string/app_name"
+                  android:screenOrientation="landscape"
+                  android:configChanges="keyboardHidden|orientation">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+    <supports-screens android:resizeable="true"
+                      android:smallScreens="true"
+                      android:normalScreens="true"
+                      android:largeScreens="true"
+                      android:anyDensity="true" />
+
+    <uses-sdk android:minSdkVersion="8" />
+
+    <uses-permission android:name="android.permission.CAMERA"/>
+
+    <uses-feature android:name="android.hardware.camera" android:required="false"/>
+    <uses-feature android:name="android.hardware.camera.autofocus" android:required="false"/>
+    <uses-feature android:name="android.hardware.camera.front" android:required="false"/>
+    <uses-feature android:name="android.hardware.camera.front.autofocus" android:required="false"/>
+
+</manifest>
diff --git a/samples/android/tutorial-4-cuda/CMakeLists.txt b/samples/android/tutorial-4-cuda/CMakeLists.txt
new file mode 100644 (file)
index 0000000..a011b33
--- /dev/null
@@ -0,0 +1,16 @@
+set(sample example-tutorial-4-cuda)
+
+ocv_check_dependencies(opencv_core opencv_java opencv_gpu)
+
+if (OCV_DEPENDENCIES_FOUND)
+  if(BUILD_FAT_JAVA_LIB)
+    set(native_deps opencv_java opencv_gpu)
+  else()
+    set(native_deps opencv_gpu)
+  endif()
+
+  add_android_project(${sample} "${CMAKE_CURRENT_SOURCE_DIR}" LIBRARY_DEPS ${OpenCV_BINARY_DIR} SDK_TARGET 11 ${ANDROID_SDK_TARGET} NATIVE_DEPS ${native_deps})
+  if(TARGET ${sample})
+    add_dependencies(opencv_android_examples ${sample})
+  endif()
+endif()
diff --git a/samples/android/tutorial-4-cuda/jni/Android.mk b/samples/android/tutorial-4-cuda/jni/Android.mk
new file mode 100644 (file)
index 0000000..3d709df
--- /dev/null
@@ -0,0 +1,13 @@
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+CUDA_TOOLKIT_DIR=$(CUDA_TOOLKIT_ROOT)
+include ../../sdk/native/jni/OpenCV.mk
+
+LOCAL_MODULE    := cuda_sample
+LOCAL_SRC_FILES := jni_part.cpp
+LOCAL_LDLIBS +=  -llog -ldl
+LOCAL_LDFLAGS += -Os
+
+include $(BUILD_SHARED_LIBRARY)
diff --git a/samples/android/tutorial-4-cuda/jni/Application.mk b/samples/android/tutorial-4-cuda/jni/Application.mk
new file mode 100644 (file)
index 0000000..4fffcb2
--- /dev/null
@@ -0,0 +1,4 @@
+APP_STL := gnustl_static
+APP_CPPFLAGS := -frtti -fexceptions
+APP_ABI := armeabi-v7a
+APP_PLATFORM := android-8
diff --git a/samples/android/tutorial-4-cuda/jni/jni_part.cpp b/samples/android/tutorial-4-cuda/jni/jni_part.cpp
new file mode 100644 (file)
index 0000000..fdb47de
--- /dev/null
@@ -0,0 +1,35 @@
+#include <jni.h>
+#include <opencv2/core/core.hpp>
+#include <opencv2/imgproc/imgproc.hpp>
+#include <opencv2/features2d/features2d.hpp>
+#include <opencv2/gpu/gpu.hpp>
+#include <vector>
+
+using namespace std;
+using namespace cv;
+using namespace cv::gpu;
+
+#include <android/log.h>
+
+#define LOG_TAG "Cuda"
+#define LOGD(...) ((void)__android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, __VA_ARGS__))
+
+extern "C" {
+JNIEXPORT void JNICALL Java_org_opencv_samples_tutorial4_Tutorial4Activity_FindFeatures(JNIEnv*, jobject, jlong addrGray, jlong addrRgba);
+
+JNIEXPORT void JNICALL Java_org_opencv_samples_tutorial4_Tutorial4Activity_FindFeatures(JNIEnv*, jobject, jlong addrGray, jlong addrRgba)
+{
+    Mat& mGr  = *(Mat*)addrGray;
+    Mat& mRgb = *(Mat*)addrRgba;
+    vector<KeyPoint> keypoints;
+    GpuMat grGpu(mGr);
+
+    FAST_GPU fast(50);
+    fast(grGpu, GpuMat(), keypoints);
+    for( unsigned int i = 0; i < keypoints.size(); i++ )
+    {
+        const KeyPoint& kp = keypoints[i];
+        circle(mRgb, Point(kp.pt.x, kp.pt.y), 10, Scalar(255,0,0,255));
+    }
+}
+}
diff --git a/samples/android/tutorial-4-cuda/res/drawable/icon.png b/samples/android/tutorial-4-cuda/res/drawable/icon.png
new file mode 100644 (file)
index 0000000..6304549
Binary files /dev/null and b/samples/android/tutorial-4-cuda/res/drawable/icon.png differ
diff --git a/samples/android/tutorial-4-cuda/res/layout/tutorial4_surface_view.xml b/samples/android/tutorial-4-cuda/res/layout/tutorial4_surface_view.xml
new file mode 100644 (file)
index 0000000..71cd6e0
--- /dev/null
@@ -0,0 +1,11 @@
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent" >
+
+    <org.opencv.android.JavaCameraView
+        android:layout_width="fill_parent"
+        android:layout_height="fill_parent"
+        android:id="@+id/tutorial4_activity_surface_view" />
+
+</LinearLayout>
diff --git a/samples/android/tutorial-4-cuda/res/values/strings.xml b/samples/android/tutorial-4-cuda/res/values/strings.xml
new file mode 100644 (file)
index 0000000..ff20b92
--- /dev/null
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">OCV T4 CUDA</string>
+</resources>
diff --git a/samples/android/tutorial-4-cuda/src/org/opencv/samples/tutorial4/Tutorial4Activity.java b/samples/android/tutorial-4-cuda/src/org/opencv/samples/tutorial4/Tutorial4Activity.java
new file mode 100644 (file)
index 0000000..2f6a48a
--- /dev/null
@@ -0,0 +1,166 @@
+package org.opencv.samples.tutorial4;
+
+import org.opencv.android.BaseLoaderCallback;
+import org.opencv.android.CameraBridgeViewBase.CvCameraViewFrame;
+import org.opencv.android.LoaderCallbackInterface;
+import org.opencv.android.OpenCVLoader;
+import org.opencv.core.CvType;
+import org.opencv.core.Mat;
+import org.opencv.android.CameraBridgeViewBase;
+import org.opencv.android.CameraBridgeViewBase.CvCameraViewListener2;
+import org.opencv.imgproc.Imgproc;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.WindowManager;
+
+public class Tutorial4Activity extends Activity implements CvCameraViewListener2 {
+    private static final String    TAG = "OCVSample::Activity";
+
+    private static final int       VIEW_MODE_RGBA     = 0;
+    private static final int       VIEW_MODE_GRAY     = 1;
+    private static final int       VIEW_MODE_CANNY    = 2;
+    private static final int       VIEW_MODE_FEATURES = 5;
+
+    private int                    mViewMode;
+    private Mat                    mRgba;
+    private Mat                    mIntermediateMat;
+    private Mat                    mGray;
+
+    private MenuItem               mItemPreviewRGBA;
+    private MenuItem               mItemPreviewGray;
+    private MenuItem               mItemPreviewCanny;
+    private MenuItem               mItemPreviewFeatures;
+
+    private CameraBridgeViewBase   mOpenCvCameraView;
+
+    private BaseLoaderCallback  mLoaderCallback = new BaseLoaderCallback(this) {
+        @Override
+        public void onManagerConnected(int status) {
+            switch (status) {
+                case LoaderCallbackInterface.SUCCESS:
+                {
+                    Log.i(TAG, "OpenCV loaded successfully");
+
+                    // Load native library after(!) OpenCV initialization
+                    System.loadLibrary("cuda_sample");
+
+                    mOpenCvCameraView.enableView();
+                } break;
+                default:
+                {
+                    super.onManagerConnected(status);
+                } break;
+            }
+        }
+    };
+
+    public Tutorial4Activity() {
+        Log.i(TAG, "Instantiated new " + this.getClass());
+    }
+
+    /** Called when the activity is first created. */
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        Log.i(TAG, "called onCreate");
+        super.onCreate(savedInstanceState);
+        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
+
+        setContentView(R.layout.tutorial4_surface_view);
+
+        mOpenCvCameraView = (CameraBridgeViewBase) findViewById(R.id.tutorial4_activity_surface_view);
+        mOpenCvCameraView.setCvCameraViewListener(this);
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        Log.i(TAG, "called onCreateOptionsMenu");
+        mItemPreviewRGBA = menu.add("Preview RGBA");
+        mItemPreviewGray = menu.add("Preview GRAY");
+        mItemPreviewCanny = menu.add("Canny");
+        mItemPreviewFeatures = menu.add("Find features");
+        return true;
+    }
+
+    @Override
+    public void onPause()
+    {
+        super.onPause();
+        if (mOpenCvCameraView != null)
+            mOpenCvCameraView.disableView();
+    }
+
+    @Override
+    public void onResume()
+    {
+        super.onResume();
+        OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_8, this, mLoaderCallback);
+    }
+
+    public void onDestroy() {
+        super.onDestroy();
+        if (mOpenCvCameraView != null)
+            mOpenCvCameraView.disableView();
+    }
+
+    public void onCameraViewStarted(int width, int height) {
+        mRgba = new Mat(height, width, CvType.CV_8UC4);
+        mIntermediateMat = new Mat(height, width, CvType.CV_8UC4);
+        mGray = new Mat(height, width, CvType.CV_8UC1);
+    }
+
+    public void onCameraViewStopped() {
+        mRgba.release();
+        mGray.release();
+        mIntermediateMat.release();
+    }
+
+    public Mat onCameraFrame(CvCameraViewFrame inputFrame) {
+        final int viewMode = mViewMode;
+        switch (viewMode) {
+        case VIEW_MODE_GRAY:
+            // input frame has gray scale format
+            Imgproc.cvtColor(inputFrame.gray(), mRgba, Imgproc.COLOR_GRAY2RGBA, 4);
+            break;
+        case VIEW_MODE_RGBA:
+            // input frame has RBGA format
+            mRgba = inputFrame.rgba();
+            break;
+        case VIEW_MODE_CANNY:
+            // input frame has gray scale format
+            mRgba = inputFrame.rgba();
+            Imgproc.Canny(inputFrame.gray(), mIntermediateMat, 80, 100);
+            Imgproc.cvtColor(mIntermediateMat, mRgba, Imgproc.COLOR_GRAY2RGBA, 4);
+            break;
+        case VIEW_MODE_FEATURES:
+            // input frame has RGBA format
+            mRgba = inputFrame.rgba();
+            mGray = inputFrame.gray();
+            FindFeatures(mGray.getNativeObjAddr(), mRgba.getNativeObjAddr());
+            break;
+        }
+
+        return mRgba;
+    }
+
+    public boolean onOptionsItemSelected(MenuItem item) {
+        Log.i(TAG, "called onOptionsItemSelected; selected item: " + item);
+
+        if (item == mItemPreviewRGBA) {
+            mViewMode = VIEW_MODE_RGBA;
+        } else if (item == mItemPreviewGray) {
+            mViewMode = VIEW_MODE_GRAY;
+        } else if (item == mItemPreviewCanny) {
+            mViewMode = VIEW_MODE_CANNY;
+        } else if (item == mItemPreviewFeatures) {
+            mViewMode = VIEW_MODE_FEATURES;
+        }
+
+        return true;
+    }
+
+    public native void FindFeatures(long matAddrGr, long matAddrRgba);
+}