Android上的OpenCV-标题;没有这样的文件/目录

Question

所以我是Android版JNI的新手，如果这是愚蠢的事情，请提前道歉。我已经安装了SDK，并在Eclipse中将其添加为项目的库。在完成所有工作后，我尝试运行ndk构建函数，但出现了以下错误：

Compile++ thumb  : face_detect_rec <= jni_part.cpp
In file included from jni/face_detect_rec.h:11:0,
                 from jni/jni_part.cpp:3:
/Users/Justin/Documents/Android/opencv-2.4.3.2-android-sdk/sdk/native/jni/include/opencv2/core/core.hpp:56:21: fatal error: algorithm: No such file or directory
compilation terminated.
make: *** [obj/local/armeabi/objs/face_detect_rec/jni_part.o] Error 1

这个文件的位置就是core.hpp所在的位置，所以我不确定为什么会出现问题。我会在下面发布我的代码供参考，谢谢大家！

jni_part.cpp:

#include <jni.h>
#include "face_detect_rec.h"
using namespace std;
using namespace cv;
extern "C" {

JNIEXPORT void JNICALL Java_com_example_opencvandroidtest_MainActivity_detectFaces(
        JNIEnv* env, jclass mClass, jstring filePath)
{
    detectFaces(filePath);
}
}

face_detect_rec.h

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <math.h>
#include <float.h>
#include <limits.h>
#include <time.h>
#include <ctype.h>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/contrib/contrib.hpp>
#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
using namespace cv;
using namespace std;
static void detectFaces(string filePath);

face_detect_rec.cpp:

#include "face_detect_rec.h"
// Create a string that contains the exact cascade name
string faceCascade_name =
        "/Users/Justin/Documents/OpenCV/data/haarcascades/haarcascade_frontalface_alt2.xml";
/*    "haarcascade_profileface.xml";*/
string eyeCascade_name =
        "/Users/Justin/Documents/OpenCV/data/haarcascades/haarcascade_mcs_lefteye.xml";
//string rightEyeCascade_name =
//    "/Users/Justin/Documents/OpenCV/data/haarcascades/haarcascade_mcs_righteye.xml";

// Function to detect and draw any faces that is present in an image
static void detectFaces(string filePath)
{
    // Create a new Haar classifier
    CascadeClassifier faceCascade;
    Mat img = imread(filePath);
    //int scale = 1;
    // Load the HaarClassifierCascade
    faceCascade.load(faceCascade_name);
    // Check whether the cascade has loaded successfully. Else report and error and quit
    if( faceCascade.empty() )
    {
        cout << "ERROR: Could not load classifier cascaden";
        return;
    }
    // There can be more than one face in an image. So create a growable sequence of faces.
    // Detect the objects and store them in the sequence
    vector<Rect> faces;
    faceCascade.detectMultiScale(img, faces, 1.1, 2, CV_HAAR_SCALE_IMAGE, cvSize(70, 70));
    // Loop the number of faces found.
    for( int i=0; i<faces.size(); i++ )
    {
        //save image
        Mat faceROI = img(faces[i]);
        stringstream s;
        s << "/mnt/sdcard/Pictures/TagSense" << i << ".jpg";
        imwrite(s.str(), faceROI);
    }
}
}

Answer 1

您的"jni"目录中有所谓的"Application.mk"文件吗？如果没有，请尝试使用以下代码创建它：

应用程序.mk：

APP_STL := gnustl_static
APP_CPPFLAGS := -frtti -fexceptions
APP_ABI := armeabi-v7a
APP_PLATFORM := android-8

希望这会有所帮助。