【移動(dòng)應(yīng)用開發(fā)技術(shù)】如何在Android中引入OpenCV

【移動(dòng)應(yīng)用開發(fā)技術(shù)】如何在Android中引入OpenCV

本篇文章為大家展示了如何在Android中引入OpenCV，內(nèi)容簡(jiǎn)明扼要并且容易理解，絕對(duì)能使你眼前一亮，通過這篇文章的詳細(xì)介紹希望你能有所收獲。首先，找到或新建jniLibs文件夾，然后將依賴的動(dòng)態(tài)庫(kù)和靜態(tài)庫(kù)（路徑為OpenCV-android-sdk\sdk\native\libs）拷貝到\src\main\jniLibs下面。然后，找到cpp文件夾。將include文件夾（路徑OpenCV-android-sdk\sdk\native\jni\include）拷貝到cpp（路徑\app\src\main\cpp）文件夾里。接著，我們需要引入c++的相關(guān)支持。在module的build.gradle里面加入：externalNativeBuild

{

cmake

{

//arguments

'-DANDROID_TOOLCHAIN=clang',

'-DANDROID_STL=gnustl_static'

cppFlags

"-std=c++11","-frtti",

"-fexceptions"

}

}

ndk{

abiFilters

'armeabi-v7a'

}最后，我們需要在CMakeLists.txt中，加入opencv相關(guān)的聲明。由于配置比較復(fù)雜，在此直接將demo的CMakeLists.txt的內(nèi)容貼到這里。#

For

more

information

about

using

CMake

with

Android

Studio,

read

the

#

documentation:

/studio/projects/add-native-code.html

#

Sets

the

minimum

version

of

CMake

required

to

build

the

native

library.

cmake_minimum_required(VERSION

3.4.1)

#

Creates

and

names

a

library,

sets

it

as

either

STATIC

#

or

SHARED,

and

provides

the

relative

paths

to

its

source

code.

#

You

can

define

multiple

libraries,

and

CMake

builds

them

for

you.

#

Gradle

automatically

packages

shared

libraries

with

your

APK.

set(CMAKE_VERBOSE_MAKEFILE

on)

set(libs

"${CMAKE_SOURCE_DIR}/src/main/jniLibs")

include_directories(${CMAKE_SOURCE_DIR}/src/main/cpp/include)

add_library(libopencv_java3

SHARED

IMPORTED

)

set_target_properties(libopencv_java3

PROPERTIES

IMPORTED_LOCATION

"${libs}/${ANDROID_ABI}/libopencv_java3.so")

add_library(libopencv_calib3d

STATIC

IMPORTED

)

set_target_properties(libopencv_calib3d

PROPERTIES

IMPORTED_LOCATION

"${libs}/${ANDROID_ABI}/libopencv_calib3d.a")

add_library(libopencv_core

STATIC

IMPORTED

)

set_target_properties(libopencv_core

PROPERTIES

IMPORTED_LOCATION

"${libs}/${ANDROID_ABI}/libopencv_core.a")

add_library(libopencv_features2d

STATIC

IMPORTED

)

set_target_properties(libopencv_features2d

PROPERTIES

IMPORTED_LOCATION

"${libs}/${ANDROID_ABI}/libopencv_features2d.a")

add_library(libopencv_flann

STATIC

IMPORTED

)

set_target_properties(libopencv_flann

PROPERTIES

IMPORTED_LOCATION

"${libs}/${ANDROID_ABI}/libopencv_flann.a")

add_library(libopencv_highgui

STATIC

IMPORTED

)

set_target_properties(libopencv_highgui

PROPERTIES

IMPORTED_LOCATION

"${libs}/${ANDROID_ABI}/libopencv_highgui.a")

add_library(libopencv_imgcodecs

STATIC

IMPORTED

)

set_target_properties(libopencv_imgcodecs

PROPERTIES

IMPORTED_LOCATION

"${libs}/${ANDROID_ABI}/libopencv_imgcodecs.a")

add_library(libopencv_imgproc

STATIC

IMPORTED

)

set_target_properties(libopencv_imgproc

PROPERTIES

IMPORTED_LOCATION

"${libs}/${ANDROID_ABI}/libopencv_imgproc.a")

add_library(libopencv_ml

STATIC

IMPORTED

)

set_target_properties(libopencv_ml

PROPERTIES

IMPORTED_LOCATION

"${libs}/${ANDROID_ABI}/libopencv_ml.a")

add_library(libopencv_objdetect

STATIC

IMPORTED

)

set_target_properties(libopencv_objdetect

PROPERTIES

IMPORTED_LOCATION

"${libs}/${ANDROID_ABI}/libopencv_objdetect.a")

add_library(libopencv_photo

STATIC

IMPORTED

)

set_target_properties(libopencv_photo

PROPERTIES

IMPORTED_LOCATION

"${libs}/${ANDROID_ABI}/libopencv_photo.a")

add_library(libopencv_shape

STATIC

IMPORTED

)

set_target_properties(libopencv_shape

PROPERTIES

IMPORTED_LOCATION

"${libs}/${ANDROID_ABI}/libopencv_shape.a")

add_library(libopencv_stitching

STATIC

IMPORTED

)

set_target_properties(libopencv_stitching

PROPERTIES

IMPORTED_LOCATION

"${libs}/${ANDROID_ABI}/libopencv_stitching.a")

add_library(libopencv_superres

STATIC

IMPORTED

)

set_target_properties(libopencv_superres

PROPERTIES

IMPORTED_LOCATION

"${libs}/${ANDROID_ABI}/libopencv_superres.a")

add_library(libopencv_video

STATIC

IMPORTED

)

set_target_properties(libopencv_video

PROPERTIES

IMPORTED_LOCATION

"${libs}/${ANDROID_ABI}/libopencv_video.a")

add_library(libopencv_videoio

STATIC

IMPORTED

)

set_target_properties(libopencv_videoio

PROPERTIES

IMPORTED_LOCATION

"${libs}/${ANDROID_ABI}/libopencv_videoio.a")

add_library(libopencv_videostab

STATIC

IMPORTED

)

set_target_properties(libopencv_videostab

PROPERTIES

IMPORTED_LOCATION

"${libs}/${ANDROID_ABI}/libopencv_videostab.a")

add_library(libopencv_ts

STATIC

IMPORTED

)

set_target_properties(libopencv_ts

PROPERTIES

IMPORTED_LOCATION

"${libs}/${ANDROID_ABI}/libopencv_ts.a")

set(CMAKE_CXX_FLAGS

"${CMAKE_CXX_FLAGS}

-std=gnu++11

-fexceptions

-frtti")

#include_directories(D:/Projects/Android/CLMAndroid/OpenCV-android-sdk/sdk/native/jni/include

)

#set(OpenCV_DIR

D:/Projects/Android/CLMAndroid/OpenCV-android-sdk/sdk/native/jni)

#find_package(OpenCV

REQUIRED)

#target_link_libraries(${OpenCV_LIBS})

add_library(

#

Sets

the

name

of

the

library.

native-lib

#

Sets

the

library

as

a

shared

library.

SHARED

#

Provides

a

relative

path

to

your

source

file(s).

src/main/cpp/native-lib.cpp

)

#

Searches

for

a

specified

prebuilt

library

and

stores

the

path

as

a

#

variable.

Because

CMake

includes

system

libraries

in

the

search

path

by

#

default,

you

only

need

to

specify

the

name

of

the

public

NDK

library

#

you

want

to

add.

CMake

verifies

that

the

library

exists

before

#

completing

its

build.

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

)

#

Specifies

libraries

CMake

should

link

to

your

target

library.

You

#

can

link

multiple

libraries,

such

as

libraries

you

define

in

this

#

build

script,

prebuilt

third-party

libraries,

or

system

libraries.

target_link_libraries(

#

Specifies

the

target

library.

native-lib

android

log

libopencv_java3

libopencv_calib3d

libopencv_core

libopencv_features2d

libopencv_flann

libopencv_highgui

libopencv_imgcodecs

libopencv_imgproc

libopencv_ml

libopencv_objdetect

libopencv_photo

libopencv_shape

libopencv_stitching

libopencv_superres

libopencv_video

libopencv_videoio

libopencv_videostab

#

Links

the

target

library

to

the

log

library

#

included

in

the

NDK.

${log-lib}

)這樣配置之后，我們就可以在cpp中，直接使用OpenCV庫(kù)了。在此貼一個(gè)簡(jiǎn)單的均值濾波：#include

<jni.h>

#include

<string>

#include

<opencv2/opencv.hpp>

#include

<bits/stdc++.h>

#include

<android/log.h>

#include<opencv2/core/core.hpp>

#include"opencv2/imgproc/imgproc.hpp"

using

namespace

cv;

using

namespace

std;

#define

MAKE_ARGB(a,

r,

g,

b)

((a&0xff)<<24)

|

((r&0xff)<<16)

|

((g&0xff)<<8)

|

(b&0xff)

#define

MAKE_RGB565(r,

g,

b)

((((r)

>>

3)

<<

11)

|

(((g)

>>

2)

<<

5)

|

((b)

>>

3))

extern

"C"

{

JNIEXPORT

jintArray

JNICALL

Java_com_live_longsiyang_opencvdemo_OpenCVNativeManager_getBlurImage(JNIEnv

*env,

jobject

thiz,

jintArray

pixels_,

jint

w,

jint

h)

{

int

colorType

=

CV_8UC4;

jint

*pixels

=

env->GetIntArrayElements(pixels_,

NULL);

Mat

imgMat(h,

w,

colorType,

pixels);

Mat

out(h,

w,

colorType);

blur(imgMat,

out,

Size(20,

20));

env->ReleaseIntArrayElements(pixels_,

pixels,

0);

int

*outIntImage

=

new

int[w

*

h];

for

(int

i

=

0;

i

<

w

*

h;

i++)

{

int

a,

r,

g,

b;

for

(int

j

=

0;

j

<

4;

j++)

{

a

=

out.data[i

*

4

+

3];

r

=

out.data[i

*

4

+

2];

g

=

out.data[i

*

4

+

1];

b

=

out.data[i

*

4

+

0];

outIntImage[i]

=

(int)

out.data[i

*

4

+

j];

}

outIntImage[i]

=

MAKE_ARGB(a,r,g,b);

}

jintArray

result

=

env->NewIntArray(w

*

h);

env->SetIntArrayRegion(result,

0,

w

*

h,

outIntImage);

return

result;

}

}這樣我們就能看到一個(gè)基本的模糊效果的demo。import

android.graphics.Bitmap;

import

android.graphics.BitmapFactory;

import

android.support.v7.app.AppCompatActivity;

import

android.os.Bundle;

import

android.util.Log;

import

android.view.View;

import

android.widget.Button;

import

android.widget.ImageView;

import

android.widget.TextView;

public

class

MainActivity

extends

AppCompatActivity

{

static

{

System.loadLibrary("native-lib");

}

ImageView

mIvTest;

Button

mBtnTest;

@Override

protected

void

onCreate(Bundle

savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

mIvTest

=

(ImageView)

findViewById(R.id.img_test);

mIvTest.setImageResource(R.drawable.beauty_steward_course_video_thumb_icon);

mBtnTest

=

(Button)

findViewById(R.id.btn_test);

mBtnTest.setOnClickListener(new

View.OnClickListener()

{

@Override

public

void

onClick(View

v)

{

Bitmap

srcBitmap

=

BitmapFactory.decodeResource(getResources(),

R.drawable.beauty_steward_course_video_thumb_icon);

int

w

=

srcBitmap.ge