基于Android studio3.6的JNI教程之ncnn之语义分割ENet

 代码链接:

https://github.com/watersink/enet-as-linux

本代码可以在模拟器下进行跑。

环境:

Android studio 3.6

Sdk:android10 api 29

Ndk:r15c

Ncnn:20200226

Opencv:Opencv3.4.1 android sdk

Linux下的代码测试:

mkdir build

cd build

cmake ..

make

./enet

运行效果,

Android开始:

(1)新建工程,

New->New Project->选择Native c++  ->工程名enet->c++11

(2)app/src/cpp下面增加opencv和ncnn的头文件,include

(3)app/src/main下面增加ncnn 和opencv的静态库文件和动态库文件,

(4)app/src/main下面增加模型文件assets

(5)修改布局文件,app/src/main/res/layout/ activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".MainActivity">

<LinearLayout

android:id="@+id/btn_ll"

android:layout_alignParentBottom="true"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:orientation="horizontal">

<Button

android:id="@+id/use_photo"

android:layout_weight="1"

android:layout_width="0dp"

android:layout_height="wrap_content"

android:text="选图"/>

<Button

android:id="@+id/detect_photo"

android:layout_weight="1"

android:layout_width="0dp"

android:layout_height="wrap_content"

android:text="分割"/>

</LinearLayout>

<ImageView

android:id="@+id/show_image"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:layout_above="@id/btn_ll"

android:layout_alignParentTop="true"

android:layout_marginTop="1dp"

android:layout_marginBottom="-1dp" />

</RelativeLayout>

(6) app/src/main/java/com/example/enet增加ENET类,

public class ENET {

public native boolean Init(byte[] param, byte[] bin);

public native float[] Process(Bitmap bitmap);

// Used to load the 'native-lib' library on application startup.

static {

System.loadLibrary("ENET");

}

}

(7) app/src/main/cpp/enet-jni.cpp实现其jni方法,

extern "C"

JNIEXPORT jboolean JNICALL

Java_com_example_enet_ENET_Init(JNIEnv *env, jobject thiz, jbyteArray param, jbyteArray bin) {

// TODO: implement Init()

ncnn::Mat ncnn_param;

ncnn::Mat ncnn_bin;

// init param

{

int len = env->GetArrayLength(param);

ncnn_param.create(len, (size_t) 1u);

env->GetByteArrayRegion(param, 0, len, (jbyte *) ncnn_param);

}

// init bin

{

int len = env->GetArrayLength(bin);

ncnn_bin.create(len, (size_t) 1u);

env->GetByteArrayRegion(bin, 0, len, (jbyte *) ncnn_bin);

}

ncnn_net = new ENET(ncnn_param,ncnn_bin);

return JNI_TRUE;

}

extern "C"

JNIEXPORT jfloatArray JNICALL

Java_com_example_enet_ENET_Process(JNIEnv *env, jobject thiz, jobject bitmap) {

// TODO: implement Process()

// ncnn from bitmap

ncnn::Mat in;

{

AndroidBitmapInfo info;

AndroidBitmap_getInfo(env, bitmap, &info);

int width = info.width;

int height = info.height;

if (info.format != ANDROID_BITMAP_FORMAT_RGBA_8888)

return NULL;

void* indata;

AndroidBitmap_lockPixels(env, bitmap, &indata);

// 把像素转换成data,并指定通道顺序

// 因为图像预处理每个网络层输入的数据格式不一样一般为300*300 128*128等等所以这类需要一个resize的操作可以在cpp中写,也可以是java读入图片时有个resize操作

//in = ncnn::Mat::from_pixels_resize((const unsigned char*)indata, ncnn::Mat::PIXEL_RGBA2RGB, width, height,300,300);

in = ncnn::Mat::from_pixels(static_cast<const unsigned char *>(indata), ncnn::Mat::PIXEL_RGBA2BGR, width, height);

// 下面一行为debug代码

__android_log_print(ANDROID_LOG_DEBUG, "ENetJniIn", "enet_process_has_input1, in.w: %d; in.h: %d in.c:%d ", in.w, in.h,in.c);

//AndroidBitmap_unlockPixels(env, bitmap);

}

{

ncnn::Mat out = ncnn_net->process(in);

__android_log_print(ANDROID_LOG_DEBUG, "ENetJniIn", "enet_process_has_output, in.w: %d; in.h: %d in.c:%d ", out.w, out.h,out.c);

int output_wsize = out.w;

int output_hsize = out.h;

//输出整理

float *output[output_wsize * output_hsize]; // float类型

for(int i = 0; i< out.h; i++) {

for (int j = 0; j < out.w; j++) {

output[i*output_wsize + j] = &out.row(

i)[j];

}

}

//建立float数组 长度为 output_wsize * output_hsize,如果只是ouput_size相当于只有一行的out的数据那就是一个object检测数据

jfloatArray jOutputData = env->NewFloatArray(output_wsize * output_hsize);

if (jOutputData == nullptr) return nullptr;

env->SetFloatArrayRegion(jOutputData, 0, output_wsize * output_hsize,

reinterpret_cast<const jfloat *>(*output));

return jOutputData;

}

}

(8) app/src/main/java/com/example/enet中MainActivity做具体的调用实现,

public class MainActivity extends AppCompatActivity {

private ENET enet = new ENET(); //java接口实例化 下面直接利用java函数调用NDK c++函数

private Bitmap yourSelectedImage = null;

private static final int SELECT_IMAGE = 1;

private static final String TAG = MainActivity.class.getName();

private ImageView show_image;

private boolean load_result = false;

private int[] ddims = {1, 3, 512, 288}; //这里的维度的值要和train model的input 一一对应

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

try

{

initENet();//初始化模型

Log.e("MainActivity", "initENet ok");

} catch (IOException e) {

Log.e("MainActivity", "initENet error");

}

init_view();//检测+view画图

}

// initialize view

private void init_view() {

show_image = (ImageView) findViewById(R.id.show_image);

Button use_photo = (Button) findViewById(R.id.use_photo);

use_photo.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View arg0) {

Intent i = new Intent(Intent.ACTION_PICK);

i.setType("image/*");

startActivityForResult(i, SELECT_IMAGE);

}

});

Button detect_photo = (Button) findViewById(R.id.detect_photo);

detect_photo.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View arg0) {

if (yourSelectedImage == null)

return;

predict_image(yourSelectedImage);

}

});

}

private void initENet() throws IOException {

byte[] param = null;

byte[] bin = null;

{

//用io流读取二进制文件,最后存入到byte[]数组中

InputStream assetsInputStream = getAssets().open("enet_512288.param.bin");// param: 网络结构文件

int available = assetsInputStream.available();

param = new byte[available];

int byteCode = assetsInputStream.read(param);

assetsInputStream.close();

}

{

//用io流读取二进制文件,最后存入到byte上,转换为int型

InputStream assetsInputStream = getAssets().open("enet_512288.bin");//bin: model文件

int available = assetsInputStream.available();

bin = new byte[available];

int byteCode = assetsInputStream.read(bin);

assetsInputStream.close();

}

load_result = enet.Init(param, bin);// 再将文件传入java的NDK接口(c++ 代码中的init接口 )

Log.d("load model", "ENet_load_model_result:" + load_result);

}

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data)

{

super.onActivityResult(requestCode, resultCode, data);

if (resultCode == RESULT_OK && null != data) {

Uri selectedImage = data.getData();

try

{

if (requestCode == SELECT_IMAGE) {

Bitmap bitmap = decodeUri(selectedImage);

Bitmap rgba = bitmap.copy(Bitmap.Config.ARGB_8888, true);

// resize to 512x288

yourSelectedImage = Bitmap.createScaledBitmap(rgba, ddims[2], ddims[3], false);

show_image.setImageBitmap(yourSelectedImage);

}

}

catch (FileNotFoundException e)

{

Log.e("MainActivity", "FileNotFoundException");

return;

}

}

}

private Bitmap decodeUri(Uri selectedImage) throws FileNotFoundException

{

// Decode image size

BitmapFactory.Options o = new BitmapFactory.Options();

o.inJustDecodeBounds = true;

BitmapFactory.decodeStream(getContentResolver().openInputStream(selectedImage), null, o);

// The new size we want to scale to

final int REQUIRED_SIZE = 600;

// Find the correct scale value. It should be the power of 2.

int width_tmp = o.outWidth, height_tmp = o.outHeight;

int scale = 1;

while (true) {

if (width_tmp / 2 < REQUIRED_SIZE

|| height_tmp / 2 < REQUIRED_SIZE) {

break;

}

width_tmp /= 2;

height_tmp /= 2;

scale *= 2;

}

// Decode with inSampleSize

BitmapFactory.Options o2 = new BitmapFactory.Options();

o2.inSampleSize = scale;

return BitmapFactory.decodeStream(getContentResolver().openInputStream(selectedImage), null, o2);

}

// predict image

private void predict_image(Bitmap bmp) {

// picture to float array

Bitmap rgba = bmp.copy(Bitmap.Config.ARGB_8888, true);

// resize

Bitmap input_bmp = Bitmap.createScaledBitmap(rgba, ddims[2], ddims[3], false);

try {

// Data format conversion takes too long

// Log.d("inputData", Arrays.toString(inputData));

long start = System.currentTimeMillis();

// get predict result

float[] result = enet.Process(input_bmp);

// time end

long end = System.currentTimeMillis();

Log.d(TAG, "origin predict result:" + Arrays.toString(result));

long time = end - start;

Log.d("result length", "length of result: " + String.valueOf(result.length));

// 画布配置

Canvas canvas = new Canvas(input_bmp);

//图像上画矩形

Paint paint = new Paint();

//continue to draw rect

Log.d(TAG, "result :" + result.length);

Log.d(TAG, "result :" + Arrays.toString(result));

for(int num = 0; num < result.length; num++){

// 画框

int row =num%ddims[2];

int col = num/ddims[2];

if (result[num]==1){

paint.setColor(Color.RED);

paint.setStyle(Paint.Style.STROKE);//不填充

canvas.drawCircle(row, col, 1, paint);

}

if (result[num]==2){

paint.setColor(Color.BLUE);

paint.setStyle(Paint.Style.STROKE);//不填充

canvas.drawCircle(row, col, 1, paint);

}

if (result[num]==3){

paint.setColor(Color.GREEN);

paint.setStyle(Paint.Style.STROKE);//不填充

canvas.drawCircle(row, col, 1, paint);

}

}

show_image.setImageBitmap(input_bmp);

} catch (Exception e) {

e.printStackTrace();

}

}

}

(9) app/src/main/cpp下面修改CMakeLists

cmake_minimum_required(VERSION 3.4.1)

include_directories(include)

file(GLOB ENET_SRC *.h

*.cpp)

set(ENET_COMPILE_CODE ${ENET_SRC})

add_library(libopencv_java3 SHARED IMPORTED)

set_target_properties(libopencv_java3 PROPERTIES IMPORTED_LOCATION

${CMAKE_SOURCE_DIR}/../jniLibs/${ANDROID_ABI}/libopencv_java3.so)

add_library(libncnn STATIC IMPORTED )

set_target_properties(libncnn

PROPERTIES IMPORTED_LOCATION

${CMAKE_SOURCE_DIR}/../jniLibs/${ANDROID_ABI}/libncnn.a)

add_library( # Sets the name of the library.

ENET ## 为生成.so的文字最好直接和.c名字一样,需要更改

# Sets the library as a shared library.

SHARED

# Provides a relative path to your source file(s).

${ENET_COMPILE_CODE})##cpp文件的name

find_library( # Sets the name of the path variable.

log-lib

# Specifies the name of the NDK library that

# you want CMake to locate.

log )

target_link_libraries( # Specifies the target library.

ENET

libncnn

libopencv_java3

jnigraphics

android

# Links the target library to the log library

# included in the NDK.

${log-lib} )

(10) app/src/下面修改build.gradle,增加下面的设置,

externalNativeBuild {

cmake {

arguments "-DANDROID_TOOLCHAIN=clang"

cFlags "-fopenmp -O2 -fvisibility=hidden -fomit-frame-pointer -fstrict-aliasing -ffunction-sections -fdata-sections -ffast-math "

cppFlags "-fopenmp -O2 -fvisibility=hidden -fvisibility-inlines-hidden -fomit-frame-pointer -fstrict-aliasing -ffunction-sections -fdata-sections -ffast-math "

arguments "-DANDROID_STL=c++_shared", "-DANDROID_CPP_FEATURES=rtti exceptions"

cppFlags ""

cppFlags "-std=c++11"

cppFlags "-frtti"

cppFlags "-fexceptions"

}

}

ndk {

abiFilters 'armeabi-v7a'// , 'arm64-v8a' //,'x86', 'x86_64', 'armeabi'

stl "gnustl_static"

}

整体目录结构:

最终效果:

总结

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