編譯環境:ubuntu 10.10
opencv版本:2.2

1.首先需要下載以下文件:

• 
  
  
• OpenCV-2.2.0.tar.bz2
• android-ndk-r4-linux-x86-crystax-4.tar.bz2
  

2.ubuntu需要以下包

sudo apt-get install build-essential
sudo apt-get install cmake
sudo apt-get install libgtk2.0-dev
sudo apt-get install swig
sudo apt-get install libpython2.6 python-dev python2.6-dev

3.解壓縮opencv后,在其目錄進行以下操作
cd release
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_PYTHON_SUPPORT=ON
-D BUILD_EXAMPLES=ON ..
make

編譯完成后安裝進系統庫中
sudo make install
sudo ldconfig

如果想測試效果可以進入samples/c目錄中執行
. build_all.sh
來編譯示例程序,然后運行find_obj來看看opencv中surf的效果

4.接下來是編譯android的版本
在編譯之前需要解壓縮 android-ndk-r4-linux-x86-crystax-4.tar.bz2到用戶目錄下,因為opencv默認在用戶目錄下尋找,當然大家也可以更改配置文件

進入android目錄中,執行以下操作:
mkdir build
cd build
cmake ..
make

這就編譯好android的庫文件了,下面來新建一個android程序來測試一下

5.創建一個android工程,工程名為opencvtest,包名為com.opencvtest
在工程的根目錄下創建一個jni文件夾,然后分別創建Android.mk和hello-jni.cpp兩個文件
Android.mk的內容如下:

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

include /home/ms/opencv/OpenCV-2.2.0/android/build/android-opencv.mk

LOCAL_LDLIBS += $(OPENCV_LIBS)

LOCAL_C_INCLUDES += $(OPENCV_INCLUDES)

LOCAL_MODULE := hello-jni

LOCAL_SRC_FILES := hello-jni.cpp

include $(BUILD_SHARED_LIBRARY)

復制代碼
其中需要注意的是要更改include /home/ms/opencv/OpenCV-2.2.0到自己的opencv目錄下
hello-jni.cpp的內容如下:

#include <jni.h>

#include <cstdlib>

#include <stdexcept>

#include <string>

#include <opencv2/core/core.hpp>

#include <opencv2/features2d/features2d.hpp>

#include <opencv2/highgui/highgui.hpp>

#include <opencv2/imgproc/imgproc.hpp>

#include <opencv2/calib3d/calib3d.hpp>

#include <opencv2/imgproc/imgproc_c.h>

static CvScalar colors[] =

{

{{0,0,255}},

{{0,128,255}},

{{0,255,255}},

{{0,255,0}},

{{255,128,0}},

{{255,255,0}},

{{255,0,0}},

{{255,0,255}},

{{255,255,255}}

};

extern "C"

jint Java_com_opencvtest_opencvtest_getKeypointNum(JNIEnv* env,jobject thiz)

{

IplImage* object = cvLoadImage( "/sdcard/src.jpg", CV_LOAD_IMAGE_GRAYSCALE );

if(object != NULL){

CvSURFParams params = cvSURFParams(500, 1);

CvMemStorage* storage = cvCreateMemStorage(0);

IplImage* object_color = cvCreateImage(cvGetSize(object), 8, 3);

CvSeq *objectKeypoints = 0;

CvSeq *objectDescriptors = 0;

cvCvtColor( object, object_color, CV_GRAY2BGR );

cvExtractSURF( object, 0, &objectKeypoints, &objectDescriptors, storage, params);

for( int i = 0; i < objectKeypoints->total; i++ )

{

CvSURFPoint* r = (CvSURFPoint*)cvGetSeqElem( objectKeypoints, i );

CvPoint center;

int radius;

center.x = cvRound(r->pt.x);

center.y = cvRound(r->pt.y);

radius = cvRound(r->size*1.2/9.*2);

cvCircle( object_color, center, radius, colors[0], 1, 8, 0 );

}

cvSaveImage( "/sdcard/src_surf.jpg" , object_color);

return objectKeypoints->total;

}

return 0;

}

復制代碼
需要注意的是,如果創建的工程名和我不一樣的話,需要更改JNI函數的函數名

更改好之后在工程的根目錄下運行
~/android-ndk-r4-crystax/ndk-build
即可進行編譯,~/android-ndk-r4-crystax指向了我自己的目錄,大家可以根據自己的情況修改

編譯完成后會創建libs和obj兩個目錄出來,同時需要注意的是要刷新android的工程來同步這兩個目錄下的內容

最后更改opencvtest.java文件來調用JNI,我的代碼如下:

package com.opencvtest;

import android.app.Activity;

import android.os.Bundle;

import android.widget.TextView;

public class opencvtest extends Activity {

private TextView mTextView;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

mTextView = (TextView) this.findViewById(R.id.textview);

mTextView.setText(Integer.toString(getKeypointNum()));

}

public native int getKeypointNum();

static {

System.loadLibrary("hello-jni");

}

}

復制代碼
6.這時候編譯出來的程序還不能在虛擬機中運行,一運行就會閃一下跳出來,這是因為opencv的android庫中有V5和V7兩種ARM架構的庫,我發現一般都會優先運行V7架構的ARM庫,但是虛擬機應該是個V5架構的,所以會馬上退出,我的G2手機也一樣,所以這時候還要對OpenCV-2.2.0/android/build/android-opencv.mk文件進行修改來讓程序在V5架構的ARM上運行,修改內容如下:

--- android-opencv.mk_backup 2011-02-27 05:31:41.813090978 -0800

+++ android-opencv.mk 2011-02-27 06:30:09.605091003 -0800

@@ -19,14 +19,10 @@

ANDROID_OPENCV_INCLUDES := $(OPENCV_ROOT)/android/android-jni/jni

ARMOBJS := local/armeabi

-ARMOBJS_V7A := local/armeabi-v7a

-OPENCV_LIB_DIRS := -L$(OPENCV_BUILD_ROOT)/obj/$(ARMOBJS_V7A) \

- -L$(OPENCV_BUILD_ROOT)/obj/$(ARMOBJS) -L$(OPENCV_BUILD_ROOT)/bin/ndk/$(ARMOBJS) \

- -L$(OPENCV_BUILD_ROOT)/bin/ndk/$(ARMOBJS_V7A)

+OPENCV_LIB_DIRS := -L$(OPENCV_BUILD_ROOT)/obj/$(ARMOBJS) -L$(OPENCV_BUILD_ROOT)/bin/ndk/$(ARMOBJS)

-ANDROID_OPENCV_LIB_DIRS := -L$(OPENCV_ROOT)/android/android-jni/libs/armeabi-v7a \

- -L$(OPENCV_ROOT)/android/android-jni/libs/armeabi

+ANDROID_OPENCV_LIB_DIRS := -L$(OPENCV_ROOT)/android/android-jni/libs/armeabi

復制代碼 主要就是去掉V7部分的內容
然后現在試用adb從電腦上push一張名字為src.jpg的文件到虛擬機的/sdcard/中,再運行程序即可看到效果,運行完畢后會生成SURF特征點檢索后的圖片

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