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本篇內容介紹了“人臉識別SDK在網絡攝像頭中怎么應用”的有關知識，在實際案例的操作過程中，不少人都會遇到這樣的困境，接下來就讓小編帶領大家學習一下如何處理這些情況吧！希望大家仔細閱讀，能夠學有所成！
a.初始化并登錄驗證
NET_DVR_Init();
NET_DVR_DEVICEINFO_V30 struDeviceInfo = { 0 };
long lUserID = NET_DVR_Login_V30(m_cameraIp, m_cameraPort,
m_cameraUser, m_cameraPwd, &struDeviceInfo);
if (lUserID < 0)
{
NET_DVR_Cleanup();
return false;
}b.創建線程并注冊回調函數
thread videoThread(&HCNetCamera::getCameraPreview, this);
videoThread.detach();
bool HCNetCamera::getCameraPreview()
{
NET_DVR_CLIENTINFO ClientInfo;
ClientInfo.lChannel = 1; //Channel number 設備通道號
ClientInfo.hPlayWnd = NULL; //窗口為空，設備SDK不解碼只取流
ClientInfo.lLinkMode = 0; //Main Stream
ClientInfo.sMultiCastIP = NULL;
//預覽取流
g_realHandle = NET_DVR_RealPlay_V30(g_cameraUserId, &ClientInfo, fRealDataCallBack, NULL, TRUE);
if (g_realHandle < 0)
{
qDebug() << "NET_DVR_RealPlay_V30 failed! Error number: " << NET_DVR_GetLastError();
return false;
}
return true;
}c.使用回調接口，獲取實時的視頻幀數據
void CALLBACK fRealDataCallBack(LONG lRealHandle, DWORD dwDataType, BYTE *pBuffer, DWORD dwBufSize, void *pUser)
{
UNREFERENCED_PARAMETER(lRealHandle);
UNREFERENCED_PARAMETER(pUser);
DWORD dRet = 0;
BOOL inData = FALSE;
switch (dwDataType)
{
case NET_DVR_SYSHEAD:
if (g_cameraPort >= 0)
{
break; //同一路碼流不需要多次調用開流接口
}
if (!PlayM4_GetPort(&g_cameraPort))
{
break;
}
if (!PlayM4_OpenStream(g_cameraPort, pBuffer, dwBufSize, 1024 * 1024))
{
dRet = PlayM4_GetLastError(g_cameraPort);
break;
}
//設置解碼回調函數
if (!PlayM4_SetDecCallBack(g_cameraPort, DecCBFun))
{
dRet = PlayM4_GetLastError(g_cameraPort);
break;
}
//打開視頻解碼
if (!PlayM4_Play(g_cameraPort, NULL))
{
dRet = PlayM4_GetLastError(g_cameraPort);
break;
}
dRet = PlayM4_GetLastError(g_cameraPort);
break;
case NET_DVR_STREAMDATA: //視頻流數據
default:
inData = PlayM4_InputData(g_cameraPort, pBuffer, dwBufSize);
while (!inData)
{
Sleep(10);
inData = PlayM4_InputData(g_cameraPort, pBuffer, dwBufSize);
dRet = PlayM4_GetLastError(g_cameraPort);
OutputDebugString(L"PlayM4_InputData failed \n");
}
break;
}
} //解碼回調 視頻為YUV數據(YV12)
void CALLBACK DecCBFun(long port, char * pBuf, long nSize, FRAME_INFO * pFrameInfo, long nReserved1, long nReserved2)
{
UNREFERENCED_PARAMETER(nReserved1);
UNREFERENCED_PARAMETER(nReserved2);
UNREFERENCED_PARAMETER(nSize);
UNREFERENCED_PARAMETER(port);
//圖像格式轉換
if (pFrameInfo->nType == T_YV12)
{
{
lock_guard<mutex> locker(g_CameraMutex);
Utils_ns::ImageUtils_ns::YV12ToBGR24_FFMPEG((unsigned char*)pBuf, (unsigned char*)g_curRGBImage->imageData,
pFrameInfo->nWidth, pFrameInfo->nHeight);//得到全部RGB圖像
}
}
}d.應用層獲取視頻幀，這里為了簡化操作，只獲取了當前幀；大家也可以使用線程安全隊列來處理
int HCNetCamera::getFrame(Mat& image)
{
lock_guard<mutex> locker(g_CameraMutex);
if (g_curRGBImage && g_curRGBImage->imageData)
{
image = g_curRGBImage;
return 0;
}
return -1;
}
//以下是線程函數的一部分，主要是取幀，然后進行人臉檢測
{
lock_guard<std::mutex> locker(g_CameraMutex);
int ret = m_camera->getFrame(curFrame);
if (ret == -1)
{
continue;
}
}
ftProcessor->faceDetect(curFrame);目前虹軟SDK支持以下幾種圖像數據格式：
在實際開發過程中一般使用opencv，opencv默認的圖像數據格式是BGR24，而我使用的海康攝像頭視頻編碼格式是H264，視頻幀數據格式是YV12，因此需要將YV12轉換為BGR24 ，同時也會說明下怎么轉換為虹軟SDK支持的其它格式，主要參考了[2]，以下的代碼僅供參考。
a.YV12 To BGR24
void yv12ToBGR24(unsigned char* yv12, unsigned char* bgr24, int width, int height)
{
unsigned char* y_yv12 = yv12;
unsigned char* v_yv12 = yv12 + width*height;
unsigned char* u_yv12 = yv12 + width*height + width*height / 4;
unsigned char* b = bgr24;
unsigned char* g = bgr24 + 1;
unsigned char* r = bgr24 + 2;
int yIndex, uIndex, vIndex;
for (int i = 0; i < height; ++i)
{
for (int j = 0; j < width; ++j)
{
yIndex = i * width + j;
vIndex = (i / 2) * (width / 2) + (j / 2);
uIndex = vIndex;
*b = (unsigned char)(y_yv12[yIndex] + 1.732446 * (u_yv12[vIndex] - 128));
*g = (unsigned char)(y_yv12[yIndex] - 0.698001 * (u_yv12[uIndex] - 128) - 0.703125 * (v_yv12[vIndex] - 128));
*r = (unsigned char)(y_yv12[yIndex] + 1.370705 * (v_yv12[uIndex] - 128));
b += 3;
g += 3;
r += 3;
}
}
}b.YV12 To I420
void yv12ToI420(unsigned char* yv12, unsigned char* i420, int width, int height)
{
unsigned char* y_yv12 = yv12;
unsigned char* v_yv12 = yv12 + width*height;
unsigned char* u_yv12 = yv12 + width*height + width*height / 4;
unsigned char* y_i420 = i420;
unsigned char* u_i420 = i420 + width*height;
unsigned char* v_i420 = i420 + width*height + width*height / 4;
memcpy(i420, yv12, width*height);
memcpy(v_i420, v_yv12, width*height / 4);
memcpy(u_i420, u_yv12, width*height / 4);
}c.YV12 To NV21
void yv12ToNV21(unsigned char* yv12, unsigned char* nv21, int width, int height)
{
unsigned char* y_yv12 = yv12;
unsigned char* v_yv12 = yv12 + width*height;
unsigned char* u_yv12 = yv12 + width*height + width*height / 4;
unsigned char* y_nv21 = nv21;
unsigned char* v_nv21 = nv21 + width*height;
unsigned char* u_nv21 = nv21 + width*height + 1;
memcpy(nv21, yv12, width*height);
for (int i = 0; i < width*height / 4; ++i)
{
*v_nv21 = *v_yv12;
*u_nv21 = *u_yv12;
v_nv21 += 2;
u_nv21 += 2;
++v_yv12;
++u_yv12;
}
}d.YV12 To NV12
void yv12ToNV12(unsigned char* yv12, unsigned char* nv12, int width, int height)
{
unsigned char* y_yv12 = yv12;
unsigned char* v_yv12 = yv12 + width*height;
unsigned char* u_yv12 = yv12 + width*height + width*height / 4;
unsigned char* y_nv12 = nv12;
unsigned char* u_nv12 = nv12 + width*height;
unsigned char* v_nv12 = nv12 + width*height + 1;
memcpy(nv12, yv12, width*height);
for (int i = 0; i < width*height / 4; ++i)
{
*v_nv12 = *v_yv12;
*u_nv12 = *u_yv12;
v_nv12 += 2;
u_nv12 += 2;
++v_yv12;
++u_yv12;
}
}e.YV12 To YUYV
void yv12ToYUYV(unsigned char* yv12, unsigned char* yuyv, int width, int height)
{
unsigned char* y_yv12 = yv12;
unsigned char* v_yv12 = yv12 + width*height;
unsigned char* u_yv12 = yv12 + width*height + width*height / 4;
unsigned char* y_yuyv = yuyv;
unsigned char* u_yuyv = yuyv + 1;
unsigned char* v_yuyv = yuyv + 3;
for (int i = 0; i < width; ++i)
{
for (int j = 0; j < height; ++j)
{
*y_yuyv = *y_yv12;
y_yuyv += 2;
++y_yv12;
}
}
for (int j = 0; j < height / 2; ++j)
{
for (int i = 0; i < width / 2; ++i)
{
*u_yuyv = *u_yv12;
*(u_yuyv + width * 2) = *u_yv12;
u_yuyv += 4;
++u_yv12;
*v_yuyv = *v_yv12;
*(v_yuyv + width * 2) = *v_yv12;
v_yuyv += 4;
++v_yv12;
}
u_yuyv += width * 2;
v_yuyv += width * 2;
}
}“人臉識別SDK在網絡攝像頭中怎么應用”的內容就介紹到這里了，感謝大家的閱讀。如果想了解更多行業相關的知識可以關注億速云網站，小編將為大家輸出更多高質量的實用文章！
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