Visual C++ Edge Detection

surgio · #1 09-Apr-2004, 02:46

Hi All,

I'm doing a project based mainly on edge/object detection but I have no idea how to get the video input into a manipulable(?) form. I'm using Visual C++ and I know if I have to manipulate the image, I first need to display it. I do have some video software that records and takes pictures but I can't do any image smoothing or object detection with it.

I think I just need to know how to get started because I run Visual C++ and say "ok, need to display video from camera", but don't know how.. haha.

Thanks in advance.

-surgio

Max Payne · #2 09-Apr-2004, 03:54

Can't give any advise since i never done image manipulation befor, but there is a lib that could be useful.. try http://www.paintlib.de/paintlib/

with this lib, u can load any image type and manipulate it before saving. I'm not sure if it supports edge detection, but it has filtering function and ithink you can define your own edge detection function.Hope it helps.

Bhushan Kalse · #3 05-Oct-2004, 07:13

Hi,
I know, I m little late to reply

) coz I recently joined this forum.
But still if anybody is looking for video capture or image processing, please go thru 'Video Capture Macros' documentation in MSDN. It has all that one need to capture and process image from simple web camera.

I can tell more, if anybody interested !!
~Bhsuhan.

JdS · #4 05-Oct-2004, 07:36

Hello Bushan,

We always welcome replies to existing threads with relevant info. Many others will find this thread, and they may not always be logged in to ask you for more details. So, please post any details you can share...

Daniel Apostol · #5 15-Oct-2004, 17:26

Hello. I did a similar project 4 months ago. I had to use 2 web cams (stereo image) insted of one so sync was required...Even so...u coul use DirectX DShow ...if u're web cam support WDM drivers all u have to do is get used to using filters. Everithing will be more simple.(PS: u will require direct x SDK )
eg:

CPP / C++ / C Code:

HRESULT CWebCam::grabFrames(void)
{
	HRESULT hr;

	if (close) return E_FAIL;

	pMediaControl->Pause();

	delete pBufferLeft;
	delete pBufferRight;

	hr = pGrabberLeft->GetCurrentBuffer(&cbBufferLeft, NULL);
	while (cbBufferLeft==0) 
	{	cbBufferLeft = 0;
		hr = pGrabberLeft->GetCurrentBuffer(&cbBufferLeft, NULL);
	}
	if (FAILED(hr))return hr;

	pBufferLeft = new unsigned char[cbBufferLeft];
	if (!pBufferLeft) return E_FAIL;

	hr = pGrabberLeft->GetCurrentBuffer(&cbBufferLeft, (long*)pBufferLeft);
	if (FAILED(hr)) return hr;


	hr = pGrabberRight->GetCurrentBuffer(&cbBufferRight, NULL);
	//stai pana ce bufferul intern poate fi citit
	
	pBufferRight = new unsigned char[cbBufferRight];
	if (!pBufferRight) return E_FAIL;
	hr = pGrabberRight->GetCurrentBuffer(&cbBufferRight, reinterpret_cast<long*>(pBufferRight));

	if (FAILED(hr)) return hr;
	pMediaControl->Run();

	return S_OK;
}

U could also use GDI (i didn't try it)

The result will be a buffer that u can for example store in a matrix for easy use.

Hope this was helpfull.

:-D Ou..u could use for testing graph edit
it helped me in designing testing filters

zerapio · #6 26-Mar-2005, 01:46

Hey Daniel, I'm also working with 2 web cameras but I'm having problems synchronizing them. Would you mind telling me how you approached this?

Thanks
-Z

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Rate This Thread
Rate This Thread:

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Microsoft Visual C++6.0 - Illegal use of this type as an expression	RealmMaster	C++ Forum	5	24-Aug-2006 13:51
Intel Compiler C++ for Embedded Visual C++	kiara	C++ Forum	1	15-Jan-2004 09:56
Convertin C++ to eMbedded Visual C++	kiara	C++ Forum	0	14-Jan-2004 01:05
Convertin C++ to eMbedded Visual C++	jbalart	C++ Forum	0	23-Dec-2003 06:44
Flash Detection for JdS!	BobbyDouglas	Websites Reviewed Forum	3	26-Aug-2003 10:58

Visual C++ Edge Detection

To Daniel