Using opencv for camera interaction games and source code

Note: This example is from China's digital art online. It has not been debugged and is reprinted here. It is just for your reference. Source of the original is: http://www.cgblog.com.cn/e/DoPrint? Classid = 29 & id = 9742.

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Recently, I saw someone using flash and the camera to make an interactive game. I thought it was very interesting. I used the library function of opencv and the VC model and made a similar haha. The effect is not very good. Next we will introduce how to connect a camera to a computer, after starting the program, there will be two beating yellow balls in the video window as your target (the ball moves to make a floating bubble, but the dynamic equation is not found, you can just design one.) There is also a white cross circle as your quasi-star. You have a red object that shakes in front of the camera to manipulate your on-board star. When the on-board star hits a yellow ball, the ball disappears. (This game requires the support of the dynamic Connection Library of opencv beta5. I want to place a x map named gun.bmp in the current directory. I use this card in the figure to decide what color of thing you can use for gymnastics to keep your star on the right)

Paste the source code.

// Auto. cpp: defines the entry point for the console application.
//

# Include "stdafx. H"
# Include "cv. H"
# Include "highgui. H"
# Include "stdio. H"
# Include "ctype. H"
# Include "math. H"

Iplimage * image = 0, * HSV = 0, * hue = 0, * mask = 0, * backproject = 0, * histimg = 0;
Cvhistogram * hist = 0;

Int backproject_mode = 0;
Int select_object = 0;
Int track_object = 0;
Int show_hist = 1;

Int xn = 0;
Int YN = 0;
Int xn2 = 0;
Int yn2 = 0;

Cvpoint origin;
Cvpoint trackpoint;
Cvrect selection;
Cvrect track_window;
Cvbox2d track_box;
Cvconnectedcomp track_comp;
Int hdims = 16;
Float hranges_arr [] ={ 0,180 };
Float * hranges = hranges_arr;
Int Vmin = 90, Vmax = 256, Smin = 90;

Cvscalar HSV 2rgb (float Hue );

// Load the specified Image
Void loadtemplateimage ()
{
Iplimage * tempimage = cvloadimage ("gun.bmp", 1 );
Cvcvtcolor (tempimage, HSV, cv_bgr2hsv );
Int _ Vmin = Vmin, _ Vmax = vmax;

Cvinranges (HSV, cvscalar (0, Smin, min (_ Vmin, _ Vmax), 0 ),
Cvscalar (180,256, max (_ Vmin, _ Vmax), 0), mask );

Cvsplit (HSV, hue, 0, 0, 0 );

Selection. x = 1;
Selection. y = 1;
Selection. width = 320-1;
Selection. Height = 240-1;

Cvsetimageroi (hue, selection );
Cvsetimageroi (mask, selection );
Cvcalchist (& hue, Hist, 0, mask );

Float max_val = 0.f;

Cvgetminmaxhistvalue (Hist, 0, & max_val, 0, 0 );
Cvconvertscale (hist-> bins, hist-> bins, max_val? 255./max_val: 0., 0 );
Cvresetimageroi (Hue );
Cvresetimageroi (mask );
Track_window = selection;
Track_object = 1;

Cvzero (histimg );
Int bin_w = histimg-> width/hdims;
For (INT I = 0; I {
Int val = cvround (cvgetreal1d (hist-> bins, I) * histimg-> height/255 );
Cvscalar color = HSV 2rgb (I * 180.f/ hdims );
Cvrectangle (histimg, cvpoint (I * bin_w, histimg-> height ),
Cvpoint (I + 1) * bin_w, histimg-> height-Val ),
Color,-1, 8, 0 );
}

Cvreleaseimage (& tempimage );

}

// Mouse Event Callback Function
Void on_mouse (INT event, int X, int y, int flags, void * PARAM)
{
If (! Image)
Return;

If (image-> origin)
Y = image-> height-y;

If (select_object)
{
Selection. x = min (x, origin. X );
Selection. Y = min (Y, origin. y );
Selection. width = selection. x + cv_iabs (X-origin. X );
Selection. Height = selection. Y + cv_iabs (Y-origin. y );

Selection. x = max (selection. X, 0 );
Selection. Y = max (selection. Y, 0 );
Selection. width = min (selection. Width, image-> width );
Selection. Height = min (selection. Height, image-> height );
Selection. Width-= selection. X;
Selection. Height-= selection. Y;
}

Switch (Event)
{
Case cv_event_lbuttondown:
Origin = cvpoint (x, y );
Selection = cvrect (X, Y, 0, 0 );
Select_object = 1;
Break;
Case cv_event_lbuttonup:
Select_object = 0;
If (selection. width> 0 & selection. Height> 0)
Track_object =-1;
Break;
}
}

// Color Space
Cvscalar HSV 2rgb (float Hue)
{
Int RGB [3], p, sector;
Static const int sector_data [] [3] =
{, 1}, {, 0}, {, 2}, {, 1}, {, 0}, {, 2 }};
Hue * = 0.033333333333333333333333333333333f;
Sector = cvfloor (Hue );
P = cvround (255 * (hue-sector ));
P ^ = Sector & 1? 255: 0;

RGB [sector_data [Sector] [0] = 255;
RGB [sector_data [Sector] [1] = 0;
RGB [sector_data [Sector] [2] = P;

Return cvscalar (RGB [2], RGB [1], RGB [0], 0 );
}

// Drag Popo
Void drawcorssmark (iplimage * DST, cvpoint pt)
{

Const int cross_len = 10;
Cvpoint pt1, pt2, pt3, Pt4;
Pt1.x = pt. X;
Pt1.y = pt. Y-cross_len;
Pt2.x = pt. X;
Pt2.y = pt. Y + cross_len;
Pt3.x = pt. X-cross_len;
Pt3.y = pt. Y;
Pt4.x = pt. x + cross_len;
Pt4.y = pt. Y;

Cvcircle (DST, PT, 10, cv_rgb (255,255,255), 2, cv_aa, 0 );

Cvline (DST, pt1, pt2, cv_rgb (255,255,255), 2, cv_aa, 0 );
Cvline (DST, pt3, Pt4, cv_rgb (255,255,255), 2, cv_aa, 0 );

}

// Point movement
Void movepopo (iplimage * DST, Int & XN, Int & yn)
{

Int xn1 = xn + 1;
Int I =-1;
Int yn1 = (INT) (Xn) + (20 * sin (Xn )));
If (xn1> = (DST-> width ))
{
Xn1 = 0;
Yn1 = 0;
}/* Image Width in pixels */
If (yn1> = (DST-> height ))
{
Xn1 = 0;
Yn1 = 0;
}

Cvpoint Pt = cvpoint (xn1, yn1 );
Cvcircle (DST, PT, 4, cv_rgb (230,255, 0), 2, cv_aa, 0 );
Xn = xn1;
YN = yn1;
}

Void movepopo1 (iplimage * DST, Int & XN, Int & yn)
{

Int xn1 = xn + 2;
Int yn1 = (INT) (Xn) + (10 * sin (Xn )));

If (xn1> = (DST-> width ))
{
Xn1 = 0;
Yn1 = 0;
}/* Image Width in pixels */
If (yn1> = (DST-> height ))
{
Xn1 = 0;
Yn1 = 0;
}

Cvpoint Pt = cvpoint (xn1, yn1 );
Cvcircle (DST, PT, 4, cv_rgb (230,255, 0), 2, cv_aa, 0 );
Xn = xn1;
YN = yn1;
}

Int main (INT argc, char ** argv)
{
Cvcapture * capture = 0;

If (argc = 1 | (argc = 2 & strlen (argv [1]) = 1 & isdigit (argv [1] [0])
Capture = cvcapturefromcam (argc = 2? Argv [1] [0]-'0': 0 );
Else if (argc = 2)
Capture = cvcapturefromavi (argv [1]);

If (! Capture)
{
Fprintf (stderr, "cocould not initialize capturing.../N ");
Return-1;
}

Printf ("hot keys:/N"
"/Tesc-quit the program/N"
"/TC-stop the tracking/N"
"/TB-switch to/from Backprojection view/N"
"/Th-show/hide object histogram/N"
"To initialize tracking, select the object with mouse/N ");

// Cvnamedwindow ("histogram", 0 );
Cvnamedwindow ("interactivecamgame", 0 );
Cvsetmousecallback ("interactivecamgame", on_mouse, 0 );
// Cvcreatetrackbar ("Vmin", "camshiftdemo", & Vmin, 256, 0 );
// Cvcreatetrackbar ("Vmax", "camshiftdemo", & Vmax, 256, 0 );
// Cvcreatetrackbar ("Smin", "camshiftdemo", & Smin, 256, 0 );

For (;;)
{
Iplimage * frame = 0;
// Int I, bin_w, C;
Int C;

Frame = cvqueryframe (capture );
If (! Frame)
Break;

If (! Image)
{
/* Allocate all the buffers */
Image = cvcreateimage (cvgetsize (FRAME), 8, 3 );
Image-> origin = frame-> origin;
HSV = cvcreateimage (cvgetsize (FRAME), 8, 3 );
Hue = cvcreateimage (cvgetsize (FRAME), 8, 1 );
Mask = cvcreateimage (cvgetsize (FRAME), 8, 1 );
Backproject = cvcreateimage (cvgetsize (FRAME), 8, 1 );
Hist = cvcreatehist (1, & hdims, cv_hist_array, & hranges, 1 );
Histimg = cvcreateimage (cvsize (320,200), 8, 3 );
Cvzero (histimg );
// Cvsaveimage ("a.bmp", image );
Loadtemplateimage ();
}

Cvcopy (frame, image, 0 );
Cvsaveimage ("a.bmp", image );
Cvcvtcolor (image, HSV, cv_bgr2hsv );

If (track_object)
{
Int _ Vmin = Vmin, _ Vmax = vmax;

Cvinranges (HSV, cvscalar (0, Smin, min (_ Vmin, _ Vmax), 0 ),
Cvscalar (180,256, max (_ Vmin, _ Vmax), 0), mask );
Cvsplit (HSV, hue, 0, 0, 0 );

Cvcalcbackproject (& hue, backproject, hist );
Cvand (backproject, mask, backproject, 0 );
Cvcamshift (backproject, track_window,
Cvtermcriteria (cv_termcrit_eps | cv_termcrit_iter, 10, 1 ),
& Track_comp, & track_box );
Track_window = track_comp.rect;

If (backproject_mode)
Cvcvtcolor (backproject, image, cv_gray2bgr );
If (image-> origin)
Track_box.angle =-track_box.angle;

// Cvellipsebox (image, track_box, cv_rgb (255, 0), 3, cv_aa, 0 );
Drawcorssmark (image, cvpointfrom32f (track_box.center ));

Movepopo (image, xn, yn );

Movepopo1 (image, xn2, yn2 );
// Movepopo (image, image-> width, image-> height );
Trackpoint = cvpointfrom32f (track_box.center );
If (SQRT (trackpoint. x-XN) * (trackpoint. x-XN) + (trackpoint. y-yn) * (trackpoint. y-yn) <10)
{
Xn = 0;
YN = 0;
Movepopo (image, xn, yn );

}

}

If (select_object & selection. width> 0 & selection. Height> 0)
{
Cvsetimageroi (image, selection );
Cvxors (image, cvscalarall (255), image, 0 );
Cvresetimageroi (image );
}

Cvshowimage ("interactivecamgame", image );
// Cvshowimage ("histogram", histimg );

C = cvwaitkey (10 );
If (C = 27)
Break;
Switch (c)
{
Case 'B ':
Backproject_mode ^ = 1;
Break;
Case 'C ':
Track_object = 0;
Cvzero (histimg );
Break;
Case 'H ':
Show_hist ^ = 1;
If (! Show_hist)
Cvdestroywindow ("histogram ");
Else
Cvnamedwindow ("histogram", 1 );
Break;
Default:
;
}
}

Cvreleasecapture (& capture );
Cvdestroywindow ("interactivecamgame ");

Return 0;
}

# Ifdef _ EIC
Main (1, "camshiftdemo. c ");
# Endif

Is it very familiar? That's right. It's just the example of using opencv.