Capture the Ipcamera image of the sea Conway and turn it into an image that OPENCV can handle (i)

Hai Kang wei visual ipcamera image capture

Capture the Ipcamera image and turn it into a OPENCV can be processed iplimage image (i)

Capture the Ipcamera image and turn it into a OPENCV can be processed iplimage image (ii)

Use of the Hai Kang Wei video camera model: ds-2cd4026fwd-(A) (P)

Hai Kang Wei visual ipcamera image capture method has two kinds:

(1) Use the net_dvr_capturejpegpicture_new inside the SDK to carry on the video capture picture

(2) capture real time stream, decode real time stream into YV12, then convert to RGB

In this blog post, I'll introduce the first method first.

The first method, the key is to invoke net_dvr_capturejpegpicture_new this function. The parameters for this function can be found in the SDK and I'll take a screenshot here to illustrate.

This function ret is used to return the size of the image of a parameter, but the function of this parameter is probably not by reference or pointer to pass the parameter, resulting in the return value is always 0 of my initialization, so for the next operation brings a bit of inconvenience- Have to use a large memory to save the image must be able to store the next.

Net_dvr_capturejpegpicture_new This function is to capture and save a single frame of data into a JPEG, stored in a specified memory space. Which is the JPEG in memory. In order to obtain the iplimage image that OPENCV can handle, it must be decoded in memory.

OpenCV the function of decoding in memory is only one: Imdecode, the following figure is a description of Imdecode

The function requires that the BUF must be an array or a vector of type byte. Therefore, you need to convert the JPEG compressed image of the char * type to a storage format.

#include <cstdio> #include <iostream> #include <ctime> #include <Windows.h> #include
HCNetSDK.h "#include" "highgui.h" #include "cv.h" using namespace CV;


using namespace Std;
typedef HWND (WINAPI *procgetconsolewindow) ();

Procgetconsolewindow Getconsolewindow;
	int main (int argc, char * argv[]) {//---------------------------------------//Initialize Net_dvr_init ();
	Setting connection time and reconnection time Net_dvr_setconnecttime (2000, 1);
	
	Net_dvr_setreconnect (10000, true);
	---------------------------------------//Get the console window handle//hmodule hKernel32 = GetModuleHandle ((LPCWSTR) "kernel32");

	
	Getconsolewindow = (Procgetconsolewindow) GetProcAddress (hKernel32, "Getconsolewindow");
	---------------------------------------//Registration device LONG Luserid;
	Net_dvr_deviceinfo_v30 Strudeviceinfo;
	Luserid = Net_dvr_login_v30 ("10.102.7.88", 8000, "admin", "12345", &strudeviceinfo);
		if (Luserid < 0) {printf ("Login error,%d\n", Net_dvr_getlasterror ());
		Net_dvr_cleanup (); Return-1;
	}//---------------------------------------//cvnamedwindow ("Camera", cv_window_autosize);
	iplimage* frame;
	Define JPEG image quality Lpnet_dvr_jpegpara Jpegpara = new Net_dvr_jpegpara;
	jpegpara->wpicquality = 0;
	
	Jpegpara->wpicsize = 9;
	char * Jpeg = new char[200*1024];
	DWORD len = 200*1024;
			
	Lpdword Ret = 0; if (!net_dvr_setcapturepicturemode (Bmp_mode)) {cout<< "Set Capture picture MODE error!"
		<<endl;
	cout<< "The error code is" <<net_dvr_getlasterror () <<endl;
	}//bool capture = Net_dvr_capturejpegpicture (Luserid,1,jpegpara, "1111");
	Vector<char>data (200*1024);
	while (1) {bool capture = net_dvr_capturejpegpicture_new (Luserid,1,jpegpara,jpeg,len,ret);
		if (!capture) {printf ("error:net_dvr_capturejpegpicture_new =%d", Net_dvr_getlasterror ());	
	return-1;

	for (int i=0;i<200*1024;i++) data[i] = Jpeg[i];
	Mat img = Imdecode (Mat (data), 1);
	Imshow ("Camera", IMG);
	
	Waitkey (1); //file * fp = fopen ("3.jpg"),"WB");
	Fwrite (JPEG,1,123*1024,FP);
	
	Fclose (FP);
return 0;
 }

Run this code of course OPENCV configuration can not be less, HCNetSDK.h must also include into the project.

Run this program, you can capture the image, but I calculated the next time, in the call Net_dvr_capturejpegpicture_new (Luserid,1,jpegpara,jpeg,len,ret), when this sentence, spents 300ms, This takes too long to be real-time. However, if there is no demand for real-time, this can be used, good understanding.

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Reprint please indicate the source: http://blog.csdn.net/wanghuiqi2008/article/details/31404571

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