Homework 3

#include "cv.h"

#include "cxcore.h"

#include "highgui.h"

#include "stdio.h"

#define alpha 2

#define x1 0

#define y1 0

int main()

{

CvCapture *capture;

IplImage *pImg;

IplImage *bImg;

IplImage *gImg;

IplImage *rImg;

IplImage *logoImg;

IplImage *mergeImg;

capture=cvCreateCameraCapture( 0 );

cvNamedWindow("Webcam",1);

cvNamedWindow("Webcam2",1);

cvNamedWindow("Webcam3",1);

cvNamedWindow("Webcam4",1);

cvNamedWindow("Webcam5",1);

logoImg=cvLoadImage("logo.jpg");

pImg = cvQueryFrame(capture);

bImg = cvCreateImage(cvSize(pImg->width,pImg->height), IPL_DEPTH_8U, 3);

gImg = cvCreateImage(cvSize(pImg->width,pImg->height), IPL_DEPTH_8U, 3);

rImg = cvCreateImage(cvSize(pImg->width,pImg->height), IPL_DEPTH_8U, 3);

mergeImg = cvCreateImage(cvSize(pImg->width,pImg->height), IPL_DEPTH_8U, 3);

while(1)

{

// Get blue pixels

for (int y=0; yheight; y++) {

uchar* ptr1=(uchar*) (pImg->imageData +y*pImg->widthStep);

uchar* ptr2=(uchar*) (bImg->imageData +y*bImg->widthStep);

for (int x=0; xwidth; x++) {

ptr2[3*x]=ptr1[3*x];

ptr2[3*x+1]=0;

ptr2[3*x+2]=0;

}

}

// Get green pixels

for (int y=0; yheight; y++) {

uchar* ptr1=(uchar*) (pImg->imageData +y*pImg->widthStep);

uchar* ptr2=(uchar*) (gImg->imageData +y*gImg->widthStep);

for (int x=0; xwidth; x++) {

ptr2[3*x]=0;

ptr2[3*x+1]=ptr1[3*x+1];

ptr2[3*x+2]=0;

}

}

// Get red pixels

for (int y=0; yheight; y++) {

uchar* ptr1=(uchar*) (pImg->imageData +y*pImg->widthStep);

uchar* ptr2=(uchar*) (rImg->imageData +y*rImg->widthStep);

for (int x=0; xwidth; x++) {

ptr2[3*x]=0;

ptr2[3*x+1]=0;

ptr2[3*x+2]=ptr1[3*x];

}

}

if( (logoImg->height + y1) <>height) {

mergeImg=cvCloneImage(pImg);

for (int y=0; yheight; y++) {

uchar* ptr1=(uchar*) (logoImg->imageData +y*logoImg->widthStep);

uchar* ptr2=(uchar*) (mergeImg->imageData +(y+y1)*mergeImg->widthStep);

for (int x=0; xwidth; x++) {

ptr2[3*(x+x1)]=alpha*ptr1[3*(x+x1)] + (1-alpha)*ptr2[3*(x+x1)];

ptr2[3*(x+x1)+1]=alpha*ptr1[3*(x+x1)+1] + (1-alpha)*ptr2[3*(x+x1)+1];

ptr2[3*(x+x1)+2]=alpha*ptr1[3*(x+x1)+2] + (1-alpha)*ptr2[3*(x+x1)+2];

}

}

}

pImg = cvQueryFrame(capture);

cvShowImage("Webcam", pImg);

cvFlip(bImg,bImg,0);

cvShowImage("Webcam2", bImg);

cvFlip(gImg,gImg,1);

cvShowImage("Webcam3", gImg);

cvFlip(rImg,rImg,0);

cvShowImage("Webcam4", rImg);

cvFlip(mergeImg,mergeImg,1);

cvShowImage("Webcam5", mergeImg);

cvWaitKey(20);

}

cvReleaseCapture(&capture);

cvDestroyWindow("Webcam");

cvDestroyWindow("Webcam2");

cvDestroyWindow("Webcam3");

cvDestroyWindow("Webcam4");

cvDestroyWindow("Webcam5");

}