我是OpenCv的新手，所以我将尝试解释我的问题。 （抱歉我的英语不好）
目标
使用OpenCv的Android应用程序，保存或下载了大量图像（无论来自哪里），让应用程序识别相机框架中的每个图像，并在找到的图像周围绘制一个矩形在那个框架中。
Something like this example但在我的情况下，如果有多个“图像匹配”，则会在同一帧或同等帧上绘制所有图像。
问题
我正在阅读很多帖子并且做了opencv示例我得到它在exe中工作但是当试图将它传递给Android应用程序时它无法正常工作。
我尝试使用SURF（它在Android中编译了非自由库），ORB和FLANN匹配器算法，但我只是为每个方向或只是点获得不同的不准确的行。
我的尝试：
基于Opencv示例2的Java活动
package org.opencv.jc.tct;
import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.CameraBridgeViewBase;
import org.opencv.android.CameraBridgeViewBase.CvCameraViewFrame;
import org.opencv.android.CameraBridgeViewBase.CvCameraViewListener2;
import org.opencv.android.LoaderCallbackInterface;
import org.opencv.android.OpenCVLoader;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.WindowManager;
public class Tutorial2Activity extends Activity implements CvCameraViewListener2 {
private static final String TAG = "TCT";
private static final int CORRECT = 0;
private static final int FAILED = 1;
private Mat mRgba;
private Mat mIntermediateMat;
private Mat mGray;
private int res = -1;
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("mixed_sample");
//Image_Interface.imageBase(); //TODO Carga los cuadros descargados de internet.
mOpenCvCameraView.enableView();
} break;
default:
{
super.onManagerConnected(status);
} break;
}
}
};
public Tutorial2Activity() {
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.tutorial2_surface_view);
mOpenCvCameraView = (CameraBridgeViewBase) findViewById(R.id.tutorial2_activity_surface_view);
mOpenCvCameraView.setCvCameraViewListener(this);
Thread th = new Thread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
res = ImageInterface.imageBase();
if(res == CORRECT)
ImageInterface.NativeDataTest();
}
});
th.start();
}
@Override
public void onPause()
{
super.onPause();
if (mOpenCvCameraView != null)
mOpenCvCameraView.disableView();
}
@Override
public void onResume()
{
super.onResume();
OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_11, 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);
mGray = new Mat(height, width, CvType.CV_8UC1);
}
public void onCameraViewStopped() {
mRgba.release();
mGray.release();
}
public Mat onCameraFrame(CvCameraViewFrame inputFrame) {
mRgba = inputFrame.rgba();
mGray = inputFrame.gray();
if(res == CORRECT){
ImageInterface.imageFrame(mGray.getNativeObjAddr(), mRgba.getNativeObjAddr());
}else if(res == FAILED){
Log.i(TAG, "Imagenes base no está lista");
}
return mGray;
}
}
中级
package org.opencv.jc.tct;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import org.opencv.android.Utils;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Environment;
import android.util.Log;
public class ImageInterface {
private static final String TAG = "TCT";
private static long[] imaArray;
public static int imageBase(){
int nativeRes = -1;
getBitmapFromURL();
if(imaArray.length > 0 && imaArray != null){
nativeRes = ProcessImagesBase(imaArray);
}
return nativeRes;
}
public static void imageFrame(long matAddrGr, long matAddrRgba){
ProcessImageFrame( matAddrGr, matAddrRgba);
}
public static void NativeDataTest(){
TestData();
}
// download data from internet //
private static void getBitmapFromURL() {
String[] imageUrl = {"http://s7.postimg.org/3yz6bb87f/libro2.jpg"};
imaArray = new long[imageUrl.length];
for(int i=0; i<imageUrl.length; i++){
try {
URL url = new URL(imageUrl[i]);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream input = connection.getInputStream();
Bitmap myBitmap = BitmapFactory.decodeStream(input);
if(myBitmap != null){
Mat mat = new Mat();
Utils.bitmapToMat(myBitmap, mat);
if(!mat.empty()){
mat.convertTo(mat, CvType.CV_8UC1);
Log.i("ImageInterface", "Image downloaded type: "+mat.type());
}else
Log.i("ImageInterface", "Mat: "+ i + " Vacias");
imaArray[i] = mat.getNativeObjAddr();
Log.i("ImageInterface", "BITMAP: "+ i + "LLENO");
}else
Log.i("ImageInterface", "BITMAP VACIO");
} catch (IOException e) {
e.printStackTrace();
}
}
Log.i("ImageInterface", "Array de direcciones: "+imaArray.length);
}
//Get App Data Folder in Android
public File getDataFolder(Context context) {
File dataDir = null;
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
dataDir = new File(Environment.getExternalStorageDirectory(), "files");
if(!dataDir.isDirectory()) {
dataDir.mkdirs();
}
}
if(!dataDir.isDirectory()) {
dataDir = context.getFilesDir();
}
return dataDir;
}
public void writeDataFolder(Context context){
String[] pathList = {"http://localhost/libro1.jpg",
"http://localhost/libro2.jpg"};
URL wallpaperURL = null;
for(int i=0; i < pathList.length;i++){
try {
wallpaperURL = new URL(pathList[i]);
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
InputStream inputStream = null;
try {
URLConnection connection = wallpaperURL.openConnection();
inputStream = new BufferedInputStream(wallpaperURL.openStream(), 10240);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
File cacheDir = context.getCacheDir();
File cacheFile = new File(cacheDir, "localFileName.jpg");
FileOutputStream outputStream = null;
try {
outputStream = new FileOutputStream(cacheFile);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
byte buffer[] = new byte[1024];
int dataSize;
try {
while ((dataSize = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, dataSize);
}
outputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
private native static int ProcessImagesBase(long[] arrayImage);
private native static void ProcessImageFrame(long matAddrGr, long matAddrRgba);
private native static void TestData();
}
C ++ JNI
JNIEXPORT jint JNICALL Java_org_opencv_jc_tct_ImageInterface_ProcessImagesBase(JNIEnv* env, jobject,jlongArray traindataaddr);
JNIEXPORT void JNICALL Java_org_opencv_jc_tct_ImageInterface_ProcessImageFrame(JNIEnv*,
jobject, jlong addrGray, jlong addrRgba);
JNIEXPORT void JNICALL Java_org_opencv_jc_tct_ImageInterface_TestData(JNIEnv*,jobject);
void trainDetector();
void trainExtractor();
void trainMatches(Mat& descriptors_scene,vector<vector<vector<DMatch> > >& matches);
void getGoodMatches(vector<vector<vector<DMatch> > >& matches, vector<vector<DMatch> >& tr_good_matches);
void perspectiveScene(vector<vector<DMatch> >& tr_good_matches, vector<KeyPoint>& keypoints_scene, Mat& img_scene);
const bool testing = false;
const int CORRECT = 0;
const int FAIL = 1;
static vector<vector<KeyPoint> > train_keypoints;
static vector<Mat> train_descriptors;
static vector<Mat> trainImages;
OrbFeatureDetector detector(400);
OrbDescriptorExtractor extractor;
FlannBasedMatcher matcher;
JNIEXPORT jint JNICALL Java_org_opencv_jc_tct_ImageInterface_ProcessImagesBase(JNIEnv* env,jobject, jlongArray traindataaddr) {
jint result = -1;
jsize a_len = env->GetArrayLength(traindataaddr);
jlong *traindata = env->GetLongArrayElements(traindataaddr,0);
#pragma omp parallel for
for(int k=0;k<a_len;k++)
{
Mat & newimage=*(Mat*)traindata[k];
trainImages.push_back(newimage);
}
// do the required manipulation on the images;
env->ReleaseLongArrayElements(traindataaddr,traindata,0);
trainDetector();
trainExtractor();
if (!train_keypoints.empty()){
LOGI("Created Keypoints!!!");
result = CORRECT;
}
else{
LOGE("Error creating the keypoints");
result = FAIL;
}
return result;
}
JNIEXPORT void JNICALL Java_org_opencv_jc_tct_ImageInterface_ProcessImageFrame(JNIEnv*,
jobject, jlong addrGray, jlong addrRgba) {
Mat& img_scene = *(Mat*) addrGray;
Mat& mRgb = *(Mat*) addrRgba;
vector<KeyPoint> keypoints_scene;
detector.detect(img_scene, keypoints_scene);
Mat descriptors_scene;
extractor.compute(img_scene, keypoints_scene, descriptors_scene);
//-- Step 3: Matching descriptor vectors using FLANN matcher
if(!descriptors_scene.empty()){
vector<vector<vector<DMatch> > > matches;
trainMatches(descriptors_scene, matches);
if(!matches.empty()){
LOGI("Matches [0]: %d",matches[0].size());
vector<vector<DMatch> > tr_good_matches;
getGoodMatches( matches, tr_good_matches);
if(!tr_good_matches.empty()){
LOGI("GOOD MATCHES FRAME size %d",tr_good_matches[0].size());
perspectiveScene(tr_good_matches, keypoints_scene, img_scene);
}else{
LOGE("MATCHES FRAME emtpy!");
}
}else
LOGE("MATCHES FRAME empty!");
}else{
LOGE("MAT Descriptor FRAME empty");
}
// Mat img_matches;
// drawMatches( img_object, keypoints_object, img_scene, keypoints_scene,
// good_matches, img_matches, Scalar::all(-1), Scalar::all(-1),
// vector<char>(), DrawMatchesFlags::NOT_DRAW_SINGLE_POINTS );
}
JNIEXPORT void JNICALL Java_org_opencv_jc_tct_ImageInterface_TestData(JNIEnv*,jobject){
if(!trainImages.empty())
LOGI("TEST Trainimages %d",trainImages.size());
else
LOGI("TEST TrainImages empty");
}
void trainDetector() {
LOGI("Train Detector");
#pragma omp parallel for
for (int i = 0; i < trainImages.size(); i++) {
vector<KeyPoint> obj_kp;
detector.detect(trainImages[i], obj_kp);
if (!obj_kp.empty()) {
train_keypoints.push_back(obj_kp);
} else if (testing) {
LOGE("Error: There are not keypoints. Func: trainDetector");
}
}
LOGI("Trainimages size %d ",trainImages.size());
}
void trainExtractor() {
#pragma omp parallel for
for (int i = 0; i < trainImages.size(); i++) {
Mat* obj_desc = new Mat();
extractor.compute(trainImages[i], train_keypoints[i], *obj_desc);
if (!(*obj_desc).empty()) {
train_descriptors.push_back(*obj_desc);
} else if (testing) {
LOGI("Error: Problem with descriptors. Func: trainExtractor");
}
}
LOGE("Train descriptors: %d",train_descriptors.size());
}
void getGoodMatches(vector<vector<vector<DMatch> > >& matches,vector<vector<DMatch> >& tr_good_matches) {
//-- Quick calculation of max and min distances between keypoints
for (int i = 0; i < train_descriptors.size(); i++) {
double max_dist = 0;
double min_dist = 100;
Mat obj_desc = train_descriptors[i];
vector<DMatch> gm;
for (int j = 0; j < min(obj_desc.rows - 1, (int) matches[i].size());j++) {
if (matches[i][j][0].distance < matches[i][j][1].distance
&& ((int) matches[i][j].size() <= 2
&& (int) matches[i][j].size() > 0)) {
gm.push_back(matches[i][j][0]);
}
}
tr_good_matches.push_back(gm);
}
}
void perspectiveScene(vector<vector<DMatch> >& tr_good_matches, vector<KeyPoint>& keypoints_scene, Mat& img_scene) {
LOGI("PERS FUNCTION");
//-- Localize the object
std::vector<Point2f> obj;
std::vector<Point2f> scene;
int R, G, B;
for (int i = 0; i < tr_good_matches.size(); i++) {
LOGI("PF: For train size[%d]: %d",i,tr_good_matches[i].size());
obj.clear();
scene.clear();
if (tr_good_matches[i].size() >= 4) {
for (int j = 0; j < tr_good_matches[i].size(); j++) {
//-- Get the keypoints from the good matches
obj.push_back(train_keypoints[i][tr_good_matches[i][j].queryIdx].pt);
scene.push_back(keypoints_scene[tr_good_matches[i][j].trainIdx].pt);
}
LOGI("Obj size: %d, scene size: %d",obj.size(),scene.size());
if (!obj.empty() && !scene.empty()) {
LOGI("OBJ size: %d, scene size: %d",obj.size(),scene.size());
Mat H = findHomography(obj, scene, CV_RANSAC);
//-- Get the corners from the image_1 ( the object to be "detected" )
vector<Point2f> obj_corners(4);
obj_corners[0] = cvPoint(0, 0);
obj_corners[1] = cvPoint(trainImages[i].cols, 0);
obj_corners[2] = cvPoint(trainImages[i].cols,
trainImages[i].rows);
obj_corners[3] = cvPoint(0, trainImages[i].rows);
vector<Point2f> scene_corners(4);
perspectiveTransform(obj_corners, scene_corners, H);
//getPerspectiveTransform(obj_corners,scene_corners);
R = rand() % 256;
G = rand() % 256;
B = rand() % 256;
//-- Draw lines between the corners (the mapped object in the scene - image_2 )
line(img_scene, scene_corners[0], scene_corners[1],
Scalar(R, G, B), 4);
line(img_scene, scene_corners[1], scene_corners[2],
Scalar(R, G, B), 4);
line(img_scene, scene_corners[2], scene_corners[3],
Scalar(R, G, B), 4);
line(img_scene, scene_corners[3], scene_corners[0],
Scalar(R, G, B), 4);
} else{
LOGE("Error: Problem with goodmatches. Func: perspectiveScene.");
}
}
}
}
void trainMatches( Mat& descriptors_scene, vector<vector<vector<DMatch> > >& matches) {
for (int i = 0; i < train_descriptors.size(); i++) {
vector<vector<DMatch> > obj_matches;
Mat desc = train_descriptors[i];
if(desc.type() != CV_32F){
desc.convertTo(desc,CV_32F);
}
if(descriptors_scene.type() != CV_32F){
descriptors_scene.convertTo(descriptors_scene,CV_32F);
}
matcher.knnMatch(desc, descriptors_scene, obj_matches, 2);
if (!obj_matches.empty()) {
matches.push_back(obj_matches);
} else if (testing) {
LOGE("Error: Problem with matches. Func: trainMatches");
}
}
}
}
感谢您的帮助！
答案 0 :(得分：0)
我使用Surf Detector，Descriptor Extractor和基于flan的Matcher在Android上尝试了mutiobject检测。我使用Jni，但是工作正常，但帧速率小于0.5。我不知道如何提高帧率？
我在Sdcard的“detect”文件夹中放了一些图像。在我按下加载的菜单中，然后加载“detect”文件夹中的图像，并在单独的线程中找到trainDescriptors。
加载图像后，按菜单中的开始开始检测对象。
<强> processframe.cpp
#include <stdio.h>
#include<jni.h>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/calib3d/calib3d.hpp>
#include <opencv2/features2d/features2d.hpp>
#include "opencv2/nonfree/nonfree.hpp"
using namespace std;
using namespace cv;
vector<Mat> trainImages;
Ptr<FeatureDetector> featureDetector=FeatureDetector::create("SIFT" );
Ptr<DescriptorExtractor> descriptorExtractor=DescriptorExtractor::create("SIFT");
Ptr<DescriptorMatcher> descriptorMatcher=DescriptorMatcher::create("FlannBased");//new BFMatcher(NORM_HAMMING,true);//
vector<vector<KeyPoint> > trainKeypoints;
vector<Mat> trainDescriptors;
vector<Point2f> scene_corners(4);
vector<Point2f> obj_corner(4);
vector<KeyPoint> queryKeypoints;
Mat queryDescriptors ;
vector<vector<DMatch> > matches;
vector<DMatch > good_matches;
int imagefound=-1;
Mat H;
char buffer[50];
int reprojectionThreshold=3;
bool refineMatchesWithHomography(const vector<KeyPoint>& querykeypoints,const vector<vector<KeyPoint> >& trainkeypoints, const vector<Mat> &trainimages,
float reprojectionthreshold,vector<DMatch>& goodmatches,int &imagefound, Mat& Homo)
{
vector<Point2f> src;
vector<Point2f> dst;
//cout<<good_matches.size()<<"\n";
if (goodmatches.size() < 8)
{
imagefound=-1;
return false;
}
for( int i=0;i<goodmatches.size();i++)
{
DMatch imatch = goodmatches[i];
src.push_back(trainkeypoints[imatch.imgIdx][imatch.trainIdx].pt);
dst.push_back(querykeypoints[imatch.queryIdx].pt);
for(int j=0;j<trainimages.size();j++)
{
if(goodmatches[j].imgIdx==j)
{
imagefound=j;
}
}
}
vector<unsigned char> maskmatch(src.size());
Homo = findHomography( src,dst , CV_RANSAC,reprojectionthreshold,maskmatch);
vector<DMatch> inliers;
for (size_t i=0; i<maskmatch.size(); i++)
{
if (maskmatch[i])
inliers.push_back(goodmatches[i]);
}
goodmatches.swap(inliers);
return goodmatches.size() >8;
}
extern "C" {
JNIEXPORT jboolean JNICALL Java_com_example_cameraobjectdetection_loadImages_NativesendPaths(JNIEnv* env, jobject obj, jobjectArray stringArray);
JNIEXPORT jint JNICALL Java_com_example_cameraobjectdetection_NativeFrameProcessor_process(JNIEnv* env, jobject obj, jlong mrgba, jlong mprocessed);
JNIEXPORT jboolean JNICALL Java_com_example_cameraobjectdetection_loadImages_NativesendPaths(JNIEnv* env, jobject obj, jobjectArray stringArray)
{
int stringCount = env->GetArrayLength(stringArray);
for (int i = 0; i<stringCount; i++) {
jstring string = (jstring) env->GetObjectArrayElement(stringArray, i);
const char *rawstring = env->GetStringUTFChars(string,0);
std::string s(rawstring);
Mat img=imread(s);
cvtColor(img,img, CV_BGR2GRAY);
trainImages.push_back(img);
env->ReleaseStringUTFChars(string,rawstring);
}
if(trainImages.empty()==0)
{
featureDetector->detect(trainImages,trainKeypoints);
descriptorExtractor->compute( trainImages, trainKeypoints, trainDescriptors );
descriptorMatcher->add( trainDescriptors );
descriptorMatcher->train();
}
else
{
return false;
}
return true;
}
JNIEXPORT jint JNICALL Java_com_example_cameraobjectdetection_NativeFrameProcessor_process(JNIEnv* env, jobject obj, jlong mrgba, jlong mprocessed)
{
Mat& mRgb = *(Mat*)mrgba;
Mat& mProcess = *(Mat*)mprocessed;
cvtColor(mRgb,mRgb, CV_BGR2GRAY);
mProcess =mRgb;
vector<KeyPoint> queryKeypoints;
featureDetector->detect(mRgb,queryKeypoints);
Mat queryDescriptors ;
descriptorExtractor->compute(mRgb,queryKeypoints,queryDescriptors);
vector<vector<DMatch> > matches;
descriptorMatcher->knnMatch(queryDescriptors,matches,2);
vector<DMatch > good_matches;
for(int i = 0; i < min(queryDescriptors.rows-1,(int) matches.size ()); i++)
{
if((matches[i][0].distance < 0.6*(matches[i][1].distance)) && ((int) matches[i].size()<=2 && (int) matches[i].size()>0))
{
good_matches.push_back(matches[i][0]);
}
}
bool foundhomography= refineMatchesWithHomography(queryKeypoints,trainKeypoints,trainImages,reprojectionThreshold,good_matches,imagefound,H);
if(foundhomography)
{
if (good_matches.size()>8&&imagefound!=-1)
{
obj_corner[0] = cvPoint(0,0);
obj_corner[1] = cvPoint( trainImages[imagefound].cols, 0 );
obj_corner[2] = cvPoint( trainImages[imagefound].cols, trainImages[imagefound].rows );
obj_corner[3] = cvPoint( 0, trainImages[imagefound].rows );
perspectiveTransform(obj_corner , scene_corners, H);
sprintf(buffer,"image is: %d",imagefound);
putText(mProcess,buffer, Point(10,20), FONT_HERSHEY_COMPLEX_SMALL, 1, Scalar(0, 255, 255));
//obj_corner.clear();
line( mProcess, scene_corners[0], scene_corners[1] , Scalar(0, 255, 0), 4 );
line( mProcess, scene_corners[1] , scene_corners[2] , Scalar( 0, 255, 0), 4 );
line(mProcess, scene_corners[2] , scene_corners[3] , Scalar( 0, 255, 0), 4 );
line(mProcess, scene_corners[3] , scene_corners[0] , Scalar( 0, 255, 0), 4 );
}
}
}
}
<强> MainActivity.java
package com.example.cameraobjectdetection;
import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.LoaderCallbackInterface;
import org.opencv.android.OpenCVLoader;
import org.opencv.android.CameraBridgeViewBase.CvCameraViewFrame;
import org.opencv.android.CameraBridgeViewBase.CvCameraViewListener2;
import org.opencv.core.Mat;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.SurfaceView;
import android.widget.SeekBar;
import android.widget.Toast;
public class MainActivity extends Activity implements CvCameraViewListener2 {
Zoomcameraview zoomcameraview;
loadImages loadimages;
boolean start;
NativeFrameProcessor nativeframeprocessor;
Mat mRgba;
Mat mProcessed;
boolean started=false;
static
{
try
{
// Load necessary libraries.
System.loadLibrary("opencv_java");
System.loadLibrary("nonfree");
}
catch( UnsatisfiedLinkError e )
{
System.err.println("Native code library failed to load.\n" + e);
}
}
private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
@Override
public void onManagerConnected(int status) {
switch (status) {
case LoaderCallbackInterface.SUCCESS:
System.loadLibrary("process");
zoomcameraview.enableFpsMeter();
zoomcameraview.enableView();
nativeframeprocessor=new NativeFrameProcessor();
break;
default:
super.onManagerConnected(status);
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
zoomcameraview = (Zoomcameraview)findViewById(R.id.ZoomCameraView);
zoomcameraview.setVisibility(SurfaceView.VISIBLE);
zoomcameraview.setZoomControl((SeekBar) findViewById(R.id.CameraZoomControls));
zoomcameraview.setCvCameraViewListener(this);
loadimages=new loadImages(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
switch (id) {
case R.id.load:
loadimages.execute();
break;
case R.id.start:
start=true;
break;
default:
break;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onPause()
{
super.onPause();
if (zoomcameraview!= null)
zoomcameraview.disableView();
}
public void onDestroy() {
super.onDestroy();
if (zoomcameraview != null)
zoomcameraview.disableView();
}
@Override
public void onResume()
{
super.onResume();
OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_3, this,mLoaderCallback );
}
@Override
public void onCameraViewStarted(int width, int height) {
// TODO Auto-generated method stub
mRgba = new Mat();
mProcessed= new Mat();
}
@Override
public void onCameraViewStopped() {
// TODO Auto-generated method stub
}
@Override
public Mat onCameraFrame(CvCameraViewFrame inputFrame) {
// TODO Auto-generated method stub
mRgba=inputFrame.rgba();
if(!start)
{
nativeframeprocessor.noprocessFrame(mRgba, mProcessed);
}
else if(start)
{
nativeframeprocessor.processFrame(mRgba, mProcessed);
}
return mProcessed;
}
}
<强> loadImages.java
package com.example.cameraobjectdetection;
import java.io.File;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Environment;
import android.util.Log;
import android.widget.Toast;
public class loadImages extends AsyncTask<Void, Void, Void>{
File[] files;
Context context;
String[] paths;
boolean nativesent;
public loadImages(Context _context)
{
context=_context;
String ExternalStorageDirectoryPath = Environment.getExternalStorageDirectory().getAbsolutePath();
String targetPath = ExternalStorageDirectoryPath + "/detect";
File targetDirector = new File(targetPath);
files = targetDirector.listFiles();
paths=new String[files.length];
}
@Override
protected Void doInBackground(Void... params) {
// TODO Auto-generated method stub
int i=0;
for (File file : files){
Log.d("images",file.getAbsolutePath());
paths[i]=file.getAbsolutePath();
i++;
}
nativesent=NativesendPaths(paths);
Log.d("images pathsent",String.valueOf(nativesent));
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
Log.d("images","loaded");
if(nativesent)
Toast.makeText(context,"Loaded",Toast.LENGTH_LONG).show();
}
public native boolean NativesendPaths(String[] paths);
}
<强> NativeFrameProcessor.java
package com.example.cameraobjectdetection;
import org.opencv.core.Mat;
import android.util.Log;
public class NativeFrameProcessor
{
public NativeFrameProcessor()
{
}
public void processFrame( Mat mRgba, Mat mProcessed)
{
int image=process(mRgba.getNativeObjAddr(), mProcessed.getNativeObjAddr());
if(image!=-1)
{
Log.d("Image found","Image is:"+String.valueOf(image));
}
}
public void noprocessFrame(Mat mRgba, Mat mProcessed)
{
mRgba.copyTo(mProcessed);
}
public native int process(long matAddrRgba, long matAddrGray);
}