Webcam capture

I know this has been posted before but I would like to know exactly how to capture the image and put it on a Graphics screen instead of the usual capture area thats created.

If you use the "Escapi.dll" and the blitzmax-examples within the archive you can found in the forums here, you will have a Tpixmap filled with the current webcamdata.

You decide yourself if you draw it or compute something out of the pixeldata.

inside the blitzmax example look for:

' A PixMap for captured data...

Global pix:TPixmap = CreatePixmap (width, height, PF_BGRA8888)

And yes it works, some months ago i made some tests with the library (snapshot a starting picture and calculate differences between this picture and the actual data you receive from the webcam, storing some informations, filtering some distortions like fingers or ears ;D and then compute things like "movement" of arms or your head for moving a ball etc).

PS: don't forget to copy the pixmap because working on the real data could end in corruption:

Function RealPixmapCopy(src:TPixmap, dest:TPixmap)
	Local srcPixelPointer:Int Ptr = Int Ptr(src.PixelPtr(0,0))
    Local srcPixelPointerBackup:Int Ptr = srcPixelPointer
    Local destPixelPointer:Int Ptr = Int Ptr(dest.PixelPtr(0,0))
    Local destPixelPointerBackup:Int Ptr = destPixelPointer
	For Local my_x:Int=0 To ((src.width)*(src.height))
		 destPixelPointer[0] = srcPixelPointer[0]
	     srcPixelPointer:+1
	     destPixelPointer:+1
	     If srcPixelPointer = srcPixelPointer+(src.pitch Shr 2)
	         srcPixelPointerBackup = srcPixelPointer
	     EndIf
	     If destPixelPointer = destPixelPointer+(dest.pitch Shr 2)
	         destPixelPointerBackup =destPixelPointer
	     EndIf
	Next        
End Function

bye MB

The Escapi.dll works great indeed with different webcams.

Keep in mind that the dll will see all video capture devices and in my case it had some problems with a video capture device on the graphics card (It was seen as device 0 and the webcam as device 1 in that case). The dll is able to get the device name so it's easy to create some kind of config for that.

Reference: http://www.blitzbasic.com/Community/posts.php?topic=66505

Hey, thanks for the help. I really couldn't find anything at all on this when I looked through the forums. I have really been trying to do this for quite a while.