求C語言從攝像頭獲取數(shù)據(jù)的代碼

你到畫圖面版里把你的BMP圖打開，另存為的時(shí)候改成JPG格式，或者在你的電腦中打開文件夾選項(xiàng)把帶有后綴的文件名的勾去掉，在BMP的圖片后面更改成你需要的格式

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哪位大神能用c語言 重寫opencv 的下面6個(gè)函數(shù)？？或者從源碼中整理出來，可以編譯，運(yùn)行？？

去git上面看看源碼

//先說一下這個(gè)函數(shù)吧

//cvNamedWindow

CV_IMPL?int?cvNamedWindow(const?char*?name,?int?flags){????

CV_FUNCNAME("cvNamedWindow");????

if?(!name)CV_ERROR(CV_StsNullPtr,?"NULL?name");????

HighguiBridge::getInstance().namedWindow(name);????

return?CV_OK;????

}???

//而它又需要HighhuiBridge這個(gè)類，它有個(gè)單例工廠方法

HighguiBridge?HighguiBridge::getInstance(){????

static?HighguiBridge?instance;????

return?instance;????

}

//上面2個(gè)函數(shù)實(shí)際調(diào)用這2個(gè)成員函數(shù)

CvWindow*?HighguiBridge::namedWindow(cv::String?name)?{

CvWindow*?window?=?HighguiBridge::getInstance().findWindowByName(name.c_str());

if?(!window)window?=?createWindow(name);

return?window;

}

//創(chuàng)建窗口先是查找有沒有已有窗口

CvWindow*?HighguiBridge::findWindowByName(cv::String?name){

auto?search?=?windowsMap-find(name);

if?(search?!=?windowsMap-end())return?search-second;

return?nullptr;

}

//如果沒有會(huì)用這個(gè)函數(shù)創(chuàng)建

CvWindow*?HighguiBridge::createWindow(cv::String?name){

CvWindow*?window?=?new?CvWindow(name);

windowsMap-insert(std::paircv::String,?CvWindow*(name,?window));

return?window;

}

//創(chuàng)建窗口是CvWindow類

class?CvWindow{????

public:????

CvWindow(cv::String?name,?int?flag?=?CV_WINDOW_NORMAL);????

~CvWindow();????

/**?@brief?NOTE:?prototype.????

Should?create?button?if?there?is?no?button?with?this?name?already.????

*/????

void?createButton(cv::String?name);????

/**?@brief?Creates?slider?if?there?is?no?slider?with?this?name?already.????

The?function?creates?slider?if?there?is?no?slider?with?this?name?already?OR?resets????

provided?values?for?the?existing?one.????

*/????

void?createSlider(cv::String?name,?int*?val,?int?count,?CvTrackbarCallback2?on_notify,?void*?userdata);????

/**?@brief?Updates?window?image.????

@param?src?Image?data?object?reference.????

The?function?updates?window?image.?If?argument?is?null?or?image?control?is?not?found?-?does?nothing.????

*/????

void?updateImage(CvMat*?arr);????

/**?@brief?Returns?reference?to?the?trackbar(slider)?registered?within?provided?window.????

@param?name?Name?of?the?window.????

The?function?returns?reference?to?the?trackbar(slider)?registered?within?provided?window.????

Returns?nullptr?if?trackbar?with?specified?name?is?not?found?or?window?reference?is?nullptr.????

*/????

CvTrackbar*?????findTrackbarByName(cv::String?name);????

Page^???????????getPage();????

private:????

cv::String?name;????

//?Holds?image?data?in?CV?format????

CvMat*?imageData;????

//?Map?of?all?sliders?assigned?to?this?window????

std::mapcv::String,?CvTrackbar**??sliderMap;????

//?Window?contents?holder????

Page^?page;????

//?Image?control?displayed?by?this?window????

Image^?imageControl;????

//?Container?for?sliders????

Panel^?sliderPanel;????

//?Container?for?buttons????

//?TODO:?prototype,?not?available?via?API????

Panel^?buttonPanel;????

//?Holds?image?width?to?arrange?other?UI?elements.????

//?Required?since?imageData-width?value?gets?recalculated?when?processing????

int?imageWidth;????

//?Default?markup?for?the?container?content?allowing?for?proper?components?placement????

static?const?Platform::String^?markupContent;????

//?Default?Slider?size,?fallback?solution?for?unexpected?edge?cases????

static?const?double?sliderDefaultWidth;????

};????

//CvWindwo構(gòu)造函數(shù)為

CvWindow::CvWindow(cv::String?name,?int?flags)?:?name(name){

this-page?=?(Page^)Windows::UI::Xaml::Markup::XamlReader::Load(const_castPlatform::String^(markupContent));

this-sliderMap?=?new?std::mapcv::String,?CvTrackbar*();

sliderPanel?=?(Panel^)page-FindName("cvTrackbar");

imageControl?=?(Image^)page-FindName("cvImage");

buttonPanel?=?(Panel^)page-FindName("cvButton");

//?Required?to?adapt?controls?to?the?size?of?the?image.

//?System?calculates?image?control?width?first,?after?that?we?can

//?update?other?controls

imageControl-Loaded?+=?ref?new?Windows::UI::Xaml::RoutedEventHandler(

[=](Platform::Object^?sender,

Windows::UI::Xaml::RoutedEventArgs^?e){

//?Need?to?update?sliders?with?appropriate?width

for(auto?iter=sliderMap-begin();iter!=sliderMap-end();++iter){

iter-second-getSlider()-Width?=?imageControl-ActualWidth;

}

//?Need?to?update?buttons?with?appropriate?width

//?TODO:?implement?when?adding?buttons

});

}

用c語言怎么實(shí)現(xiàn)android手機(jī)調(diào)用攝像頭

android 中實(shí)現(xiàn)網(wǎng)頁調(diào)用攝像頭功能方法·如下：

1/apk/res/android"

xmlns:tools="schemas/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:paddingBottom="@dimen/activity_vertical_margin"

android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

tools:context=".CameraWebviewActivity"

Button

android:id="@+id/bt"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Camera"

android:layout_alignParentTop="true"

/

WebView

android:id="@+id/wv"

android:layout_width="fill_parent"

android:layout_height="match_parent"

android:layout_below="@+id/bt"

/

/RelativeLayout

4.、編寫activity：

public class CameraWebviewActivity extends Activity {

private final static String TAG = "CameraWebviewActivity";

private Button bt;

private WebView wv;

public String fileFullName;//照相后的照片的全整路徑

private boolean fromTakePhoto; //是否是從攝像界面返回的webview

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_camera_webview);

initViews();

}

private void initViews() {

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

bt.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

System.out.println("----------------");

takePhoto( Math.random()*1000+1 + ".jpg");

}

});

wv = (WebView) findViewById(R.id.wv);

WebSettings setting = wv.getSettings();

setting.setJavaScriptEnabled(true);

wv.setWebViewClient(new WebViewClient(){

@Override

public void onPageStarted(WebView view, String url, Bitmap favicon) {

super.onPageStarted(view, url, favicon);

}

@Override

public boolean shouldOverrideUrlLoading(WebView view, String url) {

return super.shouldOverrideUrlLoading(view, url);

}

@Override

public void onPageFinished(WebView view, String url) {

super.onPageFinished(view, url);

}

});

wv.setWebChromeClient(new WebChromeClient(){

@Override//實(shí)現(xiàn)js中的alert彈窗在Activity中顯示

public boolean onJsAlert(WebView view, String url, String message, JsResult result) {

Log.d(TAG, message);

result.confirm();

return true;

}

});

wv.loadUrl("");

final Handler mHandler = new Handler();

//webview增加javascript接口，監(jiān)聽html頁面中的js點(diǎn)擊事件

wv.addJavascriptInterface(new Object(){

public String clickOnAndroid() {//將被js調(diào)用

mHandler.post(new Runnable() {

public void run() {

fromTakePhoto = true;

//調(diào)用 啟用攝像頭的自定義方法

takePhoto("testimg" + Math.random()*1000+1 + ".jpg");

System.out.println("========fileFullName: " + fileFullName);

}

});

return fileFullName;

}

}, "demo");

}

/*

* 調(diào)用攝像頭的方法

*/

public void takePhoto(String filename) {

System.out.println("----start to take photo2 ----");

Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

intent.putExtra(MediaStore.EXTRA_MEDIA_TITLE, "TakePhoto");

//判斷是否有SD卡

String sdDir = null;

boolean isSDcardExist = Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);

if(isSDcardExist) {

sdDir = Environment.getExternalStorageDirectory().getAbsolutePath();

} else {

sdDir = Environment.getRootDirectory().getAbsolutePath();

}

//確定相片保存路徑

String targetDir = sdDir + "/" + "webview_camera";

File file = new File(targetDir);

if (!file.exists()) {

file.mkdirs();

}

fileFullName = targetDir + "/" + filename;

System.out.println("----taking photo fileFullName: " + fileFullName);

//初始化并調(diào)用攝像頭

intent.putExtra(MediaStore.Images.Media.MIME_TYPE, "image/jpeg");

intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(fileFullName)));

startActivityForResult(intent, 1);

}

/*

* (non-Javadoc)

* @see android.app.Activity#onActivityResult(int, int, android.content.Intent)

* 重寫些方法，判斷是否從攝像Activity返回的webview activity

*/

@Override

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

System.out.println("----requestCode: " + requestCode + "; resultCode " + resultCode + "; fileFullName: " + fileFullName);

if (fromTakePhoto requestCode ==1 resultCode ==-1) {

wv.loadUrl("javascript:wave2('" + fileFullName + "')");

} else {

wv.loadUrl("javascript:wave2('Please take your photo')");

}

fromTakePhoto = false;

super.onActivityResult(requestCode, resultCode, data);

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.camera_webview, menu);

return true;

}

}

C++怎么實(shí)現(xiàn)打開本機(jī)攝像頭并獲取圖像?

C語言本身是無法直接控制外設(shè)的。但可以通過各種應(yīng)用編程接口(api)，間接調(diào)用外部設(shè)備。例如opencv庫。

OpenCV的全稱是：Open Source Computer Vision Library。OpenCV是一個(gè)基于（開源）發(fā)行的跨平臺(tái)計(jì)算機(jī)視覺庫，可以運(yùn)行在Linux、Windows和Mac OS操作系統(tǒng)上。它輕量級而且高效——由一系列 C 函數(shù)和少量 C++ 類構(gòu)成，同時(shí)提供了Python、Ruby、MATLAB等語言的接口，實(shí)現(xiàn)了圖像處理和計(jì)算機(jī)視覺方面的很多通用算法。

OpenCV用C++語言編寫，它的主要接口也是C++語言，但是依然保留了大量的C語言接口。該庫也有大量的Python, Java and MATLAB/OCTAVE (版本2.5)的接口。這些語言的API接口函數(shù)可以通過在線文檔獲得。如今也提供對于C#,Ch, Ruby的支持。

例程：

#include?"cv.h"

#include?"highgui.h"

int?main(int?argc,?char**?argv)?{

cvNamedWindow("win");

CvCapture*?capture?=?cvCreateCameraCapture(0);????//創(chuàng)建并獲取攝像設(shè)備

IplImage*?frame;

while(1)?{

frame?=?cvQueryFrame(capture);????//創(chuàng)建并獲取一張攝像截圖

if(!frame)?break;????????//如果失敗終止循環(huán)

cvShowImage("win",?frame);????//在一個(gè)"win"窗口,并當(dāng)中顯示該截圖

char?c?=?cvWaitKey(50);

if(c==27)?break;

}

cvReleaseCapture(capture);????????//釋放攝像設(shè)備

cvDestroyWindow("win");????????//釋放窗口"win"

return?0;

}

標(biāo)題名稱：c語言獲取攝像頭的函數(shù) c語言獲取攝像頭的函數(shù)是什么
轉(zhuǎn)載來于：http://chinadenli.net/article28/hpiocp.html

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