gistfile1.c++

void Filter::showChannel()
{
	int r_avg, g_avg, b_avg;
	CvScalar average;
	IplImage *src_img, *red_1, *green_1, *blue_1;
	IplImage *red_3, *green_3, *blue_3;

	cvNamedWindow("src");
	cvNamedWindow("red");
	cvNamedWindow("green");
	cvNamedWindow("blue");

	char* file_name = "images/twitter_icon.jpg";
	src_img = cvLoadImage(file_name, CV_LOAD_IMAGE_ANYCOLOR);
	if (src_img == NULL){
		printf("show: %s is not found.\n", file_name);
		return;
	}

	red_1 = cvCreateImage(cvGetSize(src_img), IPL_DEPTH_8U, 1);
	green_1 = cvCreateImage(cvGetSize(src_img), IPL_DEPTH_8U, 1);
	blue_1 = cvCreateImage(cvGetSize(src_img), IPL_DEPTH_8U, 1);

	red_3 = cvCreateImage(cvGetSize(src_img), IPL_DEPTH_8U, 3);
	green_3 = cvCreateImage(cvGetSize(src_img), IPL_DEPTH_8U, 3);
	blue_3 = cvCreateImage(cvGetSize(src_img), IPL_DEPTH_8U, 3);
	
	cvSetZero(red_3);
	cvSetZero(green_3);
	cvSetZero(blue_3);

	cvSplit(src_img, blue_1, green_1, red_1, NULL);

	cvMerge(NULL, NULL, red_1, NULL, red_3);
	cvMerge(NULL, green_1, NULL, NULL, green_3);
	cvMerge(blue_1, NULL, NULL, NULL, blue_3);

	cvShowImage("src", src_img);
	cvShowImage("red", red_3);
	cvShowImage("green", green_3);
	cvShowImage("blue", blue_3);

	average = cvAvg(src_img);
	r_avg = (int)average.val[2];
	g_avg = (int)average.val[1];
	b_avg = (int)average.val[0];
	printf("avg=(%3d, %3d, %3d)\n", r_avg, g_avg, b_avg);

	cvWaitKey(0);

	cvDestroyAllWindows();
	cvReleaseImage(&red_1);
	cvReleaseImage(&green_1);
	cvReleaseImage(&blue_1);
	cvReleaseImage(&red_3);
	cvReleaseImage(&green_3);
	cvReleaseImage(&blue_3);
}