编译环境:ubuntu 10.10
opencv版本:2.2
1.首先需要下载以下文件:
- 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.解压缩opencv后,在其目录进行以下操作
cd release
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_PYTHON_SUPPORT=ON -D BUILD_EXAMPLES=ON ..
make
编译完成后安装进系统库中
sudo make install
sudo ldconfig
如果想测试效果可以进入samples/c目录中执行
. build_all.sh
来编译示例程序,然后运行find_obj来看看opencv中surf的效果
4.接下来是编译android的版本
在编译之前需要解压缩android-ndk-r4-linux-x86-crystax-4.tar.bz2到用户目录下,因为opencv默认在用户目录下寻找,当然大家也可以更改配置文件
进入android目录中,执行以下操作:
mkdir build
cd build
cmake ..
make
这就编译好android的库文件了,下面来新建一个android程序来测试一下
5.创建一个android工程,工程名为opencvtest,包名为com.opencvtest
在工程的根目录下创建一个jni文件夹,然后分别创建Android.mk和hello-jni.cpp两个文件
Android.mk的内容如下:
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)
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其中需要注意的是要更改include /home/ms/opencv/OpenCV-2.2.0到自己的opencv目录下
hello-jni.cpp的内容如下:
#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;
}
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需要注意的是,如果创建的工程名和我不一样的话,需要更改JNI函数的函数名
更改好之后在工程的根目录下运行
~/android-ndk-r4-crystax/ndk-build
即可进行编译,~/android-ndk-r4-crystax指向了我自己的目录,大家可以根据自己的情况修改
编译完成后会创建libs和obj两个目录出来,同时需要注意的是要刷新android的工程来同步这两个目录下的内容
最后更改opencvtest.java文件来调用JNI,我的代码如下:
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");
}
}
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6.这时候编译出来的程序还不能在虚拟机中运行,一运行就会闪一下跳出来,这是因为opencv的android库中有V5和V7两种ARM架构的库,我发现一般都会优先运行V7架构的ARM库,但是虚拟机应该是个V5架构的,所以会马上退出,我的G2手机也一样,所以这时候还要对OpenCV-2.2.0/android/build/android-opencv.mk文件进行修改来让程序在V5架构的ARM上运行,修改内容如下:
--- 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
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主要就是去掉V7部分的内容
然后现在试用adb从电脑上push一张名字为src.jpg的文件到虚拟机的/sdcard/中,再运行程序即可看到效果,运行完毕后会生成SURF特征点检索后的图片
有写漏的地方望大家指出
thx~
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