基於opencv的相機之camera切換/閃光燈/邊緣模式/解析度(二)
阿新 • • 發佈:2019-01-31
簡介
簡而言之,就是在之前的最初基本佈局,繼續完善了camera前後攝切換、閃光燈開關,以及添加了邊緣預覽模式,以及預覽解析度設定功能。
邊緣模式
原理講解
簡單的說,就是利用ndk,使用opencv整合的Canny功能,對預覽影象做邊緣檢測,然後將這個檢測結果當做預覽影象顯示出來。
程式碼講解
1、首先是從setting介面的FirstPopupWindowView視窗,選擇進入的預覽模式中加上一個選項:邊緣模式。
com.example.camera_opencv_android.MyVariable
public String[] firstMenu = { "預覽模式", "解析度"}; public String[] priviewMenu = {"普通模式", "灰階模式", "邊緣模式"};
2、接著在預覽模式選擇函式:initPreviewPopupWindowView中,加上邊緣模式選項對應的操作
com.example.camera_opencv_android.MainActivity
previewListView.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) { if(arg2==0){ myVariable.previewFlag = 0; }else if(arg2 == 1){ myVariable.previewFlag = 1; }else if(arg2 == 2){ myVariable.previewFlag = 2; } if (myVariable.previewPopupwindow != null && myVariable.previewPopupwindow.isShowing()) { myVariable.previewPopupwindow.dismiss(); myVariable.previewPopupwindow = null; } } }); public Mat onCameraFrame(CvCameraViewFrame inputFrame) { // TODO Auto-generated method stub myVariable.mRgba = inputFrame.rgba(); if(myVariable.previewFlag==0){ }else if(myVariable.previewFlag == 1){ PreviceGray.grayProc(myVariable.mRgba.getNativeObjAddr()); }else if(myVariable.previewFlag == 2){ PreviceGray.canny(myVariable.mRgba.getNativeObjAddr()); } ............. }
通過對previewFlag的設定,來選擇預覽模式:
(1)、previewFlag為0表示正常預覽;
(2)、previewFlag為1表示灰階預覽;
(3)、previewFlag為1表示邊緣預覽;
對應的ndk裡面影象處理函式,在PreviceGray.cpp中。
效果演示
效果截圖如下:
(圖一) (圖二)
閃光燈開關
1、在上一篇初始化介面控制元件函式mainInit中,設定了閃光燈開關的控制元件ID為2,所以對應的函式操作如下:
@Override
public void onClick(View v) {
............
}else if(v.getId() == 2){
if(myVariable.myFlashLight == 0){
myVariable.mOpenCvCameraView.setFlashMode(MainActivity.this, 4);
myVariable.myFlashLight = 1;
}else{
myVariable.mOpenCvCameraView.setFlashMode(MainActivity.this, 1);
myVariable.myFlashLight = 0;
}
}
當被點選的控制元件ID為2的時候,檢查當前閃光燈狀態,如果是enable則關閉閃光燈;如果是關閉,則開啟閃光燈。
對閃光燈真正的操作函式為:setFlashMode。
com.example.camera_opencv_android.WTCamera
public void setFlashMode (Context item, int type){
Camera.Parameters params = mCamera.getParameters();
List<String> FlashModes = params.getSupportedFlashModes();
switch (type){
case 0:
if (FlashModes.contains(Camera.Parameters.FLASH_MODE_AUTO))
params.setFlashMode(Camera.Parameters.FLASH_MODE_AUTO);
else
Toast.makeText(item, "Auto Mode not supported", Toast.LENGTH_SHORT).show();
break;
case 1:
if (FlashModes.contains(Camera.Parameters.FLASH_MODE_OFF))
params.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
else
Toast.makeText(item, "Off Mode not supported", Toast.LENGTH_SHORT).show();
break;
case 2:
if (FlashModes.contains(Camera.Parameters.FLASH_MODE_ON))
params.setFlashMode(Camera.Parameters.FLASH_MODE_ON);
else
Toast.makeText(item, "On Mode not supported", Toast.LENGTH_SHORT).show();
break;
case 3:
if (FlashModes.contains(Camera.Parameters.FLASH_MODE_RED_EYE))
params.setFlashMode(Camera.Parameters.FLASH_MODE_RED_EYE);
else
Toast.makeText(item, "Red Eye Mode not supported", Toast.LENGTH_SHORT).show();
break;
case 4:
if (FlashModes.contains(Camera.Parameters.FLASH_MODE_TORCH))
params.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
else
Toast.makeText(item, "Torch Mode not supported", Toast.LENGTH_SHORT).show();
break;
}
mCamera.setParameters(params);
}
解析度設定
具體程式碼
1、這裡是在setting選項中,除了之前選項:預覽模式之外,新加入選項:解析度,對應操作函式如下:
private void initFirstPopupWindowView(View v) {
firstListView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {
if(arg2==0){
initPreviewPopupWindowView();
}else if(arg2 == 1){
initResolutionPopupWindowView();
}
}
});
private void resolutionChange(){
if(myVariable.myCameraID == 0){
myVariable.myDisplayOrientation = -1;
}else{
myVariable.myDisplayOrientation = 2;
}
myVariable.mOpenCvCameraView.setResolution(myVariable.s, myVariable.myCameraID);
}
private void initResolutionPopupWindowView() {
resolutionListView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {
if(arg2==0){
myVariable.s.height=1080;
myVariable.s.width=1920;
resolutionChange();
}else if(arg2 == 1){
myVariable.s.height=960;
myVariable.s.width=1280;
resolutionChange();
}else if(arg2 == 2){
myVariable.s.height=720;
myVariable.s.width=1280;
resolutionChange();
}else if(arg2 == 3){
myVariable.s.height=480;
myVariable.s.width=864;
resolutionChange();
}else if(arg2 == 4){
myVariable.s.height=480;
myVariable.s.width=720;
resolutionChange();
}else if(arg2 == 5){
myVariable.s.height=360;
myVariable.s.width=480;
resolutionChange();
}
............
}
});
在解析度選擇視窗中,根據不同選擇,來設定不同的解析度到結構myVariable.s中。接著在resolutionChange中,利用setResolution進行具體的解析力
設定。
com.example.camera_opencv_android.WTCamera
public void setResolution(Camera.Size resolution, int cameraID) {
disconnectCamera();
myConnectCamera((int)resolution.width, (int)resolution.height, cameraID);
}
這裡需要稍微改動下Opencv庫中的程式碼:
org.opencv.android.JavaCameraView
protected boolean initializeCamera(int width, int height, int cameraID) {
..........
try {
mCamera = Camera.open(cameraID);
}
}
@Override
protected boolean connectCamera(int width, int height) {
.............
if (!initializeCamera(width, height, 0))
return false;
.............
}
@Override
protected boolean myConnectCamera(int width, int height, int cameraID) {
/* 1. We need to instantiate camera
* 2. We need to start thread which will be getting frames
*/
/* First step - initialize camera connection */
Log.d(TAG, "Connecting to camera");
if (!initializeCamera(width, height, cameraID))
return false;
mCameraFrameReady = false;
/* now we can start update thread */
Log.d(TAG, "Starting processing thread");
mStopThread = false;
mThread = new Thread(new CameraWorker());
mThread.start();
return true;
}
在connectCamera呼叫的函式initializeCamera中,加上了初始化cameraId的引數,另外新寫了一個函式myConnectCamera,該函式在
connectCamera基礎上,加上了前後攝camera的選擇操作。主要是為了方便之後的camera前後攝切換功能。
效果演示
效果截圖如下:
(圖三) (圖四)
前後攝切換
和閃光燈開關類似,camera切換控制元件ID為3。對應操作程式碼如下:
public void onClick(View v) {
// TODO Auto-generated method stub
if(v.getId() == 1){
initFirstPopupWindowView(v);
}else if(v.getId() == 3){
if(myVariable.myCameraID == 0){
myVariable.s.height=960;
myVariable.s.width=1280;
myVariable.myDisplayOrientation = 2;
myVariable.mOpenCvCameraView.changeCamera(myVariable.s, 1);
myVariable.myCameraID = 1;
}else{
myVariable.s.height=1080;
myVariable.s.width=1920;
myVariable.myDisplayOrientation = -1;
myVariable.mOpenCvCameraView.changeCamera(myVariable.s, 0);
myVariable.myCameraID = 0;
}
}
com.example.camera_opencv_android.WTCamera
public void changeCamera(Camera.Size resolution, int cameraID){
disconnectCamera();
myConnectCamera((int)resolution.width, (int)resolution.height, cameraID);
}
從程式碼中可以看到,點選camera切換控制元件之後,首先檢查當前使用的camera裝置:myCameraID,為0表示為後攝,為1表示為前攝。然後修改myCameraID值,表示進行了切換,接著從新設定了camera的解析度。最後通過函式changeCamera來呼叫myConnectCamera,最終進行了解析度和camera的切換。
函式myConnectCamera,已經在之前解析度設定功能中,做了講解。
具體演示下載:http://download.csdn.net/detail/u011630458/9261617