python读取海康威视摄像头价格_OpenCV+海康威视摄像头的实时读取
OpenCV+海康威視攝像頭的實(shí)時(shí)讀取
之前沒想過會有這么多朋友遇到問題，所以建了一個(gè)qq群536898072，專門供大家以后一起交流討論圖像和機(jī)器學(xué)習(xí)的project實(shí)踐問題。
環(huán)境
硬件：
PC：i7-4970 16GB內(nèi)存 攝像頭型號：DS-2CD3310D-I(2.8mm)
配置
保證使用SADP工具能夠識別攝像頭，然后配置IP與電腦在同一個(gè)網(wǎng)段。
再保證能夠從瀏覽器中訪問。賬號password默認(rèn)的通常是admin、a123456789(老版本號的攝像頭password是12345)。
登錄成功后可能要求下載WebComponent控件。下載好了安裝便是。假設(shè)仍然出現(xiàn)例如以下畫面：
則換一種瀏覽器試。
通常是默認(rèn)瀏覽器沒問題的。
配置使用sdk中自帶的ClientDemo.exe工具能夠訪問
配置sdk開發(fā)環(huán)境
– opencv的配置
這里不展開講opencv的配置，僅說明須要配置opencv環(huán)境變量、設(shè)置好相應(yīng)的vs開發(fā)環(huán)境的屬性配置
– 海康威視sdk屬性配置
由于是64位環(huán)境。為了增強(qiáng)屬性配置的內(nèi)聚性，單獨(dú)加入新項(xiàng)目屬性表，設(shè)置海康威視sdk的屬性
依賴庫寫全。為：
HCNetSDK.lib;PlayCtrl.lib;ws2_32.lib;winmm.lib;GdiPlus.lib;IPHlpApi.Lib;%(AdditionalDependencies)
代碼及說明
#include
#include
#include
#include
#include
#include
#include
#include
/*#include "PlayM4.h"*/
#include
#include
#include
#include "global.h"
#include "readCamera.h"
#define USECOLOR 1
using namespace cv;
using namespace std;
//--------------------------------------------
int iPicNum=0;//Set channel NO.
LONG nPort=-1;
HWND hWnd=NULL;
void yv12toYUV(char *outYuv, char *inYv12, int width, int height,int widthStep)
{
int col,row;
unsigned int Y,U,V;
int tmp;
int idx;
//printf("widthStep=%d.\n",widthStep);
for (row=0; row
{
idx=row * widthStep;
int rowptr=row*width;
for (col=0; col
{
//int colhalf=col>>1;
tmp = (row/2)*(width/2)+(col/2);
// if((row==1)&&( col>=1400 &&col<=1600))
// {
// printf("col=%d,row=%d,width=%d,tmp=%d.\n",col,row,width,tmp);
// printf("row*width+col=%d,width*height+width*height/4+tmp=%d,width*height+tmp=%d.\n",row*width+col,width*height+width*height/4+tmp,width*height+tmp);
// }
Y=(unsigned int) inYv12[row*width+col];
U=(unsigned int) inYv12[width*height+width*height/4+tmp];
V=(unsigned int) inYv12[width*height+tmp];
// if ((col==200))
// {
// printf("col=%d,row=%d,width=%d,tmp=%d.\n",col,row,width,tmp);
// printf("width*height+width*height/4+tmp=%d.\n",width*height+width*height/4+tmp);
// return ;
// }
if((idx+col*3+2)> (1200 * widthStep))
{
//printf("row * widthStep=%d,idx+col*3+2=%d.\n",1200 * widthStep,idx+col*3+2);
}
outYuv[idx+col*3] = Y;
outYuv[idx+col*3+1] = U;
outYuv[idx+col*3+2] = V;
}
}
//printf("col=%d,row=%d.\n",col,row);
}
//解碼回調(diào) 視頻為YUV數(shù)據(jù)(YV12)，音頻為PCM數(shù)據(jù)
void CALLBACK DecCBFun(long nPort,char * pBuf,long nSize,FRAME_INFO * pFrameInfo, long nReserved1,long nReserved2)
{
long lFrameType = pFrameInfo->nType;
if(lFrameType ==T_YV12)
{
#if USECOLOR
//int start = clock();
static IplImage* pImgYCrCb = cvCreateImage(cvSize(pFrameInfo->nWidth,pFrameInfo->nHeight), 8, 3);//得到圖像的Y分量
yv12toYUV(pImgYCrCb->imageData, pBuf, pFrameInfo->nWidth,pFrameInfo->nHeight,pImgYCrCb->widthStep);//得到所有RGB圖像
static IplImage* pImg = cvCreateImage(cvSize(pFrameInfo->nWidth,pFrameInfo->nHeight), 8, 3);
cvCvtColor(pImgYCrCb,pImg,CV_YCrCb2RGB);
//int end = clock();
#else
static IplImage* pImg = cvCreateImage(cvSize(pFrameInfo->nWidth,pFrameInfo->nHeight), 8, 1);
memcpy(pImg->imageData,pBuf,pFrameInfo->nWidth*pFrameInfo->nHeight);
#endif
//printf("%d\n",end-start);
Mat frametemp(pImg),frame;
//frametemp.copyTo(frame);
// cvShowImage("IPCamera",pImg);
// cvWaitKey(1);
EnterCriticalSection(&g_cs_frameList);
g_frameList.push_back(frametemp);
LeaveCriticalSection(&g_cs_frameList);
#if USECOLOR
// cvReleaseImage(&pImgYCrCb);
// cvReleaseImage(&pImg);
#else
/*cvReleaseImage(&pImg);*/
#endif
//此時(shí)是YV12格式的視頻數(shù)據(jù)，保存在pBuf中，能夠fwrite(pBuf,nSize,1,Videofile);
//fwrite(pBuf,nSize,1,fp);
}
/***************
else if (lFrameType ==T_AUDIO16)
{
//此時(shí)是音頻數(shù)據(jù)，數(shù)據(jù)保存在pBuf中。能夠fwrite(pBuf,nSize,1,Audiofile);
}
else
{
}
*******************/
}
///實(shí)時(shí)流回調(diào)
void CALLBACK fRealDataCallBack(LONG lRealHandle,DWORD dwDataType,BYTE *pBuffer,DWORD dwBufSize,void *pUser)
{
DWORD dRet;
switch (dwDataType)
{
case NET_DVR_SYSHEAD: //系統(tǒng)頭
if (!PlayM4_GetPort(&nPort)) //獲取播放庫未使用的通道號
{
break;
}
if(dwBufSize > 0)
{
if (!PlayM4_OpenStream(nPort,pBuffer,dwBufSize,1024*1024))
{
dRet=PlayM4_GetLastError(nPort);
break;
}
//設(shè)置解碼回調(diào)函數(shù) 僅僅解碼不顯示
if (!PlayM4_SetDecCallBack(nPort,DecCBFun))
{
dRet=PlayM4_GetLastError(nPort);
break;
}
//設(shè)置解碼回調(diào)函數(shù) 解碼且顯示
//if (!PlayM4_SetDecCallBackEx(nPort,DecCBFun,NULL,NULL))
//{
// dRet=PlayM4_GetLastError(nPort);
// break;
//}
//打開視頻解碼
if (!PlayM4_Play(nPort,hWnd))
{
dRet=PlayM4_GetLastError(nPort);
break;
}
//打開音頻解碼, 須要碼流是復(fù)合流
// if (!PlayM4_PlaySound(nPort))
// {
// dRet=PlayM4_GetLastError(nPort);
// break;
// }
}
break;
case NET_DVR_STREAMDATA: //碼流數(shù)據(jù)
if (dwBufSize > 0 && nPort != -1)
{
BOOL inData=PlayM4_InputData(nPort,pBuffer,dwBufSize);
while (!inData)
{
Sleep(10);
inData=PlayM4_InputData(nPort,pBuffer,dwBufSize);
OutputDebugString(L"PlayM4_InputData failed \n");
}
}
break;
}
}
void CALLBACK g_ExceptionCallBack(DWORD dwType, LONG lUserID, LONG lHandle, void *pUser)
{
char tempbuf[256] = {0};
switch(dwType)
{
case EXCEPTION_RECONNECT: //預(yù)覽時(shí)重連
printf("----------reconnect--------%d\n", time(NULL));
break;
default:
break;
}
}
unsigned readCamera(void *param)
{
//---------------------------------------
// 初始化
NET_DVR_Init();
//設(shè)置連接時(shí)間與重連時(shí)間
NET_DVR_SetConnectTime(2000, 1);
NET_DVR_SetReconnect(10000, true);
//---------------------------------------
// 獲取控制臺窗體句柄
//HMODULE hKernel32 = GetModuleHandle((LPCWSTR)"kernel32");
//GetConsoleWindow = (PROCGETCONSOLEWINDOW)GetProcAddress(hKernel32,"GetConsoleWindow");
//---------------------------------------
// 注冊設(shè)備
LONG lUserID;
NET_DVR_DEVICEINFO_V30 struDeviceInfo;
lUserID = NET_DVR_Login_V30("192.168.2.64", 8000, "admin", "a123456789", &struDeviceInfo);
if (lUserID < 0)
{
printf("Login error, %d\n", NET_DVR_GetLastError());
NET_DVR_Cleanup();
return -1;
}
//---------------------------------------
//設(shè)置異常消息回調(diào)函數(shù)
NET_DVR_SetExceptionCallBack_V30(0, NULL,g_ExceptionCallBack, NULL);
//cvNamedWindow("IPCamera");
//---------------------------------------
//啟動預(yù)覽并設(shè)置回調(diào)數(shù)據(jù)流
NET_DVR_CLIENTINFO ClientInfo;
ClientInfo.lChannel = 1; //Channel number 設(shè)備通道號
ClientInfo.hPlayWnd = NULL; //窗體為空。設(shè)備SDK不解碼僅僅取流
ClientInfo.lLinkMode = 0; //Main Stream
ClientInfo.sMultiCastIP = NULL;
LONG lRealPlayHandle;
lRealPlayHandle = NET_DVR_RealPlay_V30(lUserID,&ClientInfo,fRealDataCallBack,NULL,TRUE);
if (lRealPlayHandle<0)
{
printf("NET_DVR_RealPlay_V30 failed! Error number: %d\n",NET_DVR_GetLastError());
return 0;
}
//cvWaitKey(0);
Sleep(-1);
//fclose(fp);
//---------------------------------------
//關(guān)閉預(yù)覽
if(!NET_DVR_StopRealPlay(lRealPlayHandle))
{
printf("NET_DVR_StopRealPlay error! Error number: %d\n",NET_DVR_GetLastError());
return 0;
}
//注銷用戶
NET_DVR_Logout(lUserID);
NET_DVR_Cleanup();
return 0;
}
當(dāng)中終于得到的幀保存在g_frameList.push_back(frametemp);中。
前后設(shè)置了相應(yīng)的鎖，用來對該幀序列的讀寫進(jìn)行保護(hù)。這一部分內(nèi)容是要自己完畢的。即定義變量：
CRITICAL_SECTION g_cs_frameList;
std::list g_frameList;
主函數(shù)中的調(diào)用代碼，先建立線程，調(diào)用上述讀攝像頭的函數(shù)的回調(diào)，并把讀到的幀序列保存在g_frameList中。然后再讀取該序列，保存到Mat里就可以：
int main()
{
HANDLE hThread;
unsigned threadID;
Mat frame1;
InitializeCriticalSection(&g_cs_frameList);
hThread = (HANDLE)_beginthreadex( NULL, 0, &readCamera, NULL, 0, &threadID );
...
EnterCriticalSection(&g_cs_frameList);
if(g_frameList.size())
{
list::iterator it;
it = g_frameList.end();
it--;
Mat dbgframe = (*(it));
//imshow("frame from camera",dbgframe);
//dbgframe.copyTo(frame1);
//dbgframe.release();
(*g_frameList.begin()).copyTo(frame[i]);
frame1 = dbgframe;
g_frameList.pop_front();
}
g_frameList.clear(); // 丟掉舊的幀
LeaveCriticalSection(&g_cs_frameList);
...
return 0;
}
總結(jié)
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