基于web的android图像处理示例(Win7+Apache+PHP+Matlab+Android)【转】
本文将介绍C/S模式的图像处理系统。C/S的框架已经在中作了简单的介绍。中介绍了如何搭建基于android和WAMP5的B/S模式的本机测试平台。本系统是在中介绍的基础上开发的，有关图像显示和本地图像处理的框架可以参看; @author:郑海波 zhb931706659@126.com转载请声明：http://blog.iyunv.com/nuptboyzhb/article/details/7945249
实验结果展示：（图像的DCT变换）
实验平台： 服务器：Windows 7+Apache+MySQL+PHP 客户端：Android 开发工具：Eclipse+ADT+AVD 我们先看客户端(Client)的android开发 1.图像处理框架： 本次试验的图像处理框架我们依然使用的实验平台。该实验平台已经实现了图像的打开，保存，摄像，截屏，显示和简单的图像处理算法等功能。 我们本次试验，需要用到该框架的图像打开，显示，保存等基本功能。 2.客户端的核心 在客户端，C/S模式的核心就是如何将本机数据发送到服务器，并从服务器中下载处理完后的数据。由于连接服务器，发送，接收等需要较长时间，因此 我们将其过程封装到一个AsyncTask派生的类中，代码如下：
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[*]publicclass ServerTaskextends AsyncTask
[*] {
[*] publicbyte[] dataToServer;
[*]
[*] //Task state
[*] privatefinalint UPLOADING_PHOTO_STATE= 0;
[*] privatefinalint SERVER_PROC_STATE= 1;
[*]
[*] private ProgressDialog dialog;
[*] //upload photo to server
[*] HttpURLConnection uploadPhoto(FileInputStream fileInputStream)
[*] {
[*]
[*] //final String serverFileName = "test"+ (int) Math.round(Math.random()*1000) + ".jpg";
[*] final String serverFileName = "test.jpg";
[*] final String lineEnd = "\r\n";
[*] final String twoHyphens = "--";
[*] final String boundary = "*****";
[*] Log.e("msg","begin HttpURLConnection......");
[*] try
[*] {
[*] URL url = new URL(SERVERURL);
[*] // Open a HTTP connection to the URL
[*] final HttpURLConnection conn = (HttpURLConnection)url.openConnection();
[*] // Allow Inputs
[*] conn.setDoInput(true);
[*] // Allow Outputs
[*] conn.setDoOutput(true);
[*] // Don't use a cached copy.
[*] conn.setUseCaches(false);
[*]
[*] // Use a post method.
[*] conn.setRequestMethod("POST");
[*] conn.setRequestProperty("Connection", "Keep-Alive");
[*] conn.setRequestProperty("Content-Type", "multipart/form-data;boundary="+boundary);
[*]
[*] DataOutputStream dos = new DataOutputStream( conn.getOutputStream() );
[*]
[*] dos.writeBytes(twoHyphens + boundary + lineEnd);
[*] dos.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\";filename=\"" + serverFileName +"\"" + lineEnd);
[*] dos.writeBytes(lineEnd);
[*]
[*] // create a buffer of maximum size
[*] int bytesAvailable = fileInputStream.available();
[*] int maxBufferSize = 1024;
[*] int bufferSize = Math.min(bytesAvailable, maxBufferSize);
[*] byte[] buffer = newbyte;
[*]
[*] // read file and write it into form...
[*] int bytesRead = fileInputStream.read(buffer, 0, bufferSize);
[*]
[*] while (bytesRead > 0)
[*] {
[*] dos.write(buffer, 0, bufferSize);
[*] bytesAvailable = fileInputStream.available();
[*] bufferSize = Math.min(bytesAvailable, maxBufferSize);
[*] bytesRead = fileInputStream.read(buffer, 0, bufferSize);
[*] }
[*]
[*] // send multipart form data after file data...
[*] dos.writeBytes(lineEnd);
[*] dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
[*] publishProgress(SERVER_PROC_STATE);
[*] // close streams
[*] fileInputStream.close();
[*] dos.flush();
[*] Log.e("msg","upload finished!");
[*] return conn;
[*] }
[*] catch (MalformedURLException ex){
[*] Log.e(TAG, "error: " + ex.getMessage(), ex);
[*] returnnull;
[*] }
[*] catch (IOException ioe){
[*] Log.e(TAG, "error: " + ioe.getMessage(), ioe);
[*] returnnull;
[*] }
[*] }
[*]
[*] //get image result from server and display it in result view
[*] void getResultImage(HttpURLConnection conn){
[*] // retrieve the response from server
[*] InputStream is;
[*] try {
[*] is = conn.getInputStream();
[*] //get result image from server
[*] resultForWebImage = BitmapFactory.decodeStream(is);
[*] is.close();
[*] IsShowingResult = true;
[*] Log.d("msg","download finished!");
[*] } catch (IOException e) {
[*] Log.e(TAG,"getResultImage:"+e.toString());
[*] e.printStackTrace();
[*] }
[*] }
[*] //Main code for processing image algorithm on the server
[*] void processImage(String inputImageFilePath){
[*] publishProgress(UPLOADING_PHOTO_STATE);
[*] File inputFile = new File(inputImageFilePath);
[*] try {
[*]
[*] //create file stream for captured image file
[*] FileInputStream fileInputStream= new FileInputStream(inputFile);
[*]
[*] //upload photo
[*] final HttpURLConnectionconn = uploadPhoto(fileInputStream);
[*]
[*] //get processed photo from server
[*] if (conn != null){
[*] getResultImage(conn);
[*] //String download="http://10.10.145.154/EE368_Android_Tutorial3_Server/computeSIFTOnSCIEN.php";
[*]
[*] }
[*] fileInputStream.close();
[*] }
[*] catch (FileNotFoundException ex){
[*] Log.e(TAG, "processImage"+ex.toString());
[*] }
[*] catch (IOException ex){
[*] Log.e(TAG, "processImage"+ex.toString());
[*] }
[*] }
[*]
[*] public ServerTask() {
[*] dialog = new ProgressDialog(SystemMain.this);
[*] }
[*]
[*] protectedvoid onPreExecute() {
[*] this.dialog.setMessage("Photo captured");
[*] this.dialog.show();
[*] }
[*] @Override
[*] protected Void doInBackground(String... params) { //background operation
[*] String uploadFilePath = params;
[*] processImage(uploadFilePath);
[*] //release camera when previous image is processed
[*] mCameraReadyFlag = true;
[*] returnnull;
[*] }
[*] //progress update, display dialogs
[*] @Override
[*] protectedvoid onProgressUpdate(Integer... progress) {
[*] if(progress == UPLOADING_PHOTO_STATE){
[*] dialog.setMessage("Uploading");
[*] dialog.show();
[*] }
[*] elseif (progress == SERVER_PROC_STATE){
[*] if (dialog.isShowing()) {
[*] dialog.dismiss();
[*] }
[*] dialog.setMessage("Processing");
[*] dialog.show();
[*] }
[*] }
[*] @Override
[*] protectedvoid onPostExecute(Void param) {
[*] if (dialog.isShowing()) {
[*] dialog.dismiss();
[*]
[*] if(IsShowingResult){
[*] ShowImage(resultForWebImage, 2);
[*] IsShowingResult=false;
[*] }
[*] }
[*] }
[*] }
public class ServerTaskextends AsyncTask
{
public byte[] dataToServer;
//Task state
private final int UPLOADING_PHOTO_STATE= 0;
private final int SERVER_PROC_STATE= 1;
private ProgressDialog dialog;
//upload photo to server
HttpURLConnection uploadPhoto(FileInputStream fileInputStream)
{
//final String serverFileName = "test"+ (int) Math.round(Math.random()*1000) + ".jpg";
final String serverFileName = "test.jpg";
final String lineEnd = "\r\n";
final String twoHyphens = "--";
final String boundary = "*****";
Log.e("msg","begin HttpURLConnection......");
try
{
URL url = new URL(SERVERURL);
// Open a HTTP connection to the URL
final HttpURLConnection conn = (HttpURLConnection)url.openConnection();
// Allow Inputs
conn.setDoInput(true);
// Allow Outputs
conn.setDoOutput(true);
// Don't use a cached copy.
conn.setUseCaches(false);
// Use a post method.
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("Content-Type", "multipart/form-data;boundary="+boundary);
DataOutputStream dos = new DataOutputStream( conn.getOutputStream() );
dos.writeBytes(twoHyphens + boundary + lineEnd);
dos.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\";filename=\"" + serverFileName +"\"" + lineEnd);
dos.writeBytes(lineEnd);
// create a buffer of maximum size
int bytesAvailable = fileInputStream.available();
int maxBufferSize = 1024;
int bufferSize = Math.min(bytesAvailable, maxBufferSize);
byte[] buffer = new byte;
// read file and write it into form...
int bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0)
{
dos.write(buffer, 0, bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
}
// send multipart form data after file data...
dos.writeBytes(lineEnd);
dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
publishProgress(SERVER_PROC_STATE);
// close streams
fileInputStream.close();
dos.flush();
Log.e("msg","upload finished!");
return conn;
}
catch (MalformedURLException ex){
Log.e(TAG, "error: " + ex.getMessage(), ex);
return null;
}
catch (IOException ioe){
Log.e(TAG, "error: " + ioe.getMessage(), ioe);
return null;
}
}
//get image result from server and display it in result view
void getResultImage(HttpURLConnection conn){
// retrieve the response from server
InputStream is;
try {
is = conn.getInputStream();
//get result image from server
resultForWebImage = BitmapFactory.decodeStream(is);
is.close();
IsShowingResult = true;
Log.d("msg","download finished!");
} catch (IOException e) {
Log.e(TAG,"getResultImage:"+e.toString());
e.printStackTrace();
}
}
//Main code for processing image algorithm on the server
void processImage(String inputImageFilePath){
publishProgress(UPLOADING_PHOTO_STATE);
File inputFile = new File(inputImageFilePath);
try {
//create file stream for captured image file
FileInputStream fileInputStream= new FileInputStream(inputFile);
//upload photo
final HttpURLConnectionconn = uploadPhoto(fileInputStream);
//get processed photo from server
if (conn != null){
getResultImage(conn);
//String download="http://10.10.145.154/EE368_Android_Tutorial3_Server/computeSIFTOnSCIEN.php";
}
fileInputStream.close();
}
catch (FileNotFoundException ex){
Log.e(TAG, "processImage"+ex.toString());
}
catch (IOException ex){
Log.e(TAG, "processImage"+ex.toString());
}
}
public ServerTask() {
dialog = new ProgressDialog(SystemMain.this);
}
protected void onPreExecute() {
this.dialog.setMessage("Photo captured");
this.dialog.show();
}
@Override
protected Void doInBackground(String... params) {//background operation
String uploadFilePath = params;
processImage(uploadFilePath);
//release camera when previous image is processed
mCameraReadyFlag = true;
return null;
}
//progress update, display dialogs
@Override
protected void onProgressUpdate(Integer... progress) {
if(progress == UPLOADING_PHOTO_STATE){
dialog.setMessage("Uploading");
dialog.show();
}
else if (progress == SERVER_PROC_STATE){
if (dialog.isShowing()) {
dialog.dismiss();
}
dialog.setMessage("Processing");
dialog.show();
}
}
@Override
protected void onPostExecute(Void param) {
if (dialog.isShowing()) {
dialog.dismiss();
if(IsShowingResult){
ShowImage(resultForWebImage, 2);
IsShowingResult=false;
}
}
}
}
此时，我们只需要在适当的时候，启动这个任务。当用户点击send按钮时，启动服务：
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[*]sendBtnListener=new OnClickListener() {
[*]
[*] @Override
[*] publicvoid onClick(View v) {
[*] // TODO Auto-generated method stub
[*]
[*] if(myBitmap!=null){
[*] mClientForWeb.compressByteImage(myBitmap, 75);;
[*] ServerTask task = new ServerTask();
[*] Log.e("msg","new ServerTask finished!");
[*] task.execute(Environment.getExternalStorageDirectory().toString() +mClientForWeb.INPUT_IMG_FILENAME);
[*] }
[*] }
[*]};
sendBtnListener=new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(myBitmap!=null){
mClientForWeb.compressByteImage(myBitmap, 75);;
ServerTask task = new ServerTask();
Log.e("msg","new ServerTask finished!");
task.execute(Environment.getExternalStorageDirectory().toString() +mClientForWeb.INPUT_IMG_FILENAME);
}
}
};
服务器端的PHP代码和matlab代码 1.服务器端的执行流程 首先，PHP获取到客户端发送过来的数据，然后在PHP中调用matlab代码对数据进行处理。PHP将处理后的结果再发回给客户端 2.本次试验 本次试验我们将实现图像的DCT变换。也即是：对客户端发送的图像做DCT变换，然后将变换后的图像发回给客户端。 如下图： [图]
3.matlab的执行方式 我们用命令行的方式执行matlab代码，参见。在PHP中，我们只需要用exec函数调用相应的指令即可。 4.PHP代码
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