Replace tab with four space

modules/optflow/samples/motempl.cpp

@@ -12,14 +12,14 @@ using namespace cv::motempl;
 
 static void help(void)
 {
-	printf(
-		"\nThis program demonstrated the use of motion templates -- basically using the gradients\n"
-		"of thresholded layers of decaying frame differencing. New movements are stamped on top with floating system\n"
-		"time code and motions too old are thresholded away. This is the 'motion history file'. The program reads from the camera of your choice or from\n"
-		"a file. Gradients of motion history are used to detect direction of motion etc\n"
-		"Usage :\n"
-		"./motempl [camera number 0-n or file name, default is camera 0]\n"
-		);
+    printf(
+        "\nThis program demonstrated the use of motion templates -- basically using the gradients\n"
+        "of thresholded layers of decaying frame differencing. New movements are stamped on top with floating system\n"
+        "time code and motions too old are thresholded away. This is the 'motion history file'. The program reads from the camera of your choice or from\n"
+        "a file. Gradients of motion history are used to detect direction of motion etc\n"
+        "Usage :\n"
+        "./motempl [camera number 0-n or file name, default is camera 0]\n"
+        );
 }
 // various tracking parameters (in seconds)
 const double MHI_DURATION = 5;
@@ -42,127 +42,127 @@ vector<Rect> regions;
 //  args - optional parameters
 static void  update_mhi(const Mat& img, Mat& dst, int diff_threshold)
 {
-	double timestamp = (double)clock() / CLOCKS_PER_SEC; // get current time in seconds
-	Size size = img.size();
-	int i, idx1 = last;
-	Rect comp_rect;
-	double count;
-	double angle;
-	Point center;
-	double magnitude;
-	Scalar color;
-
-	// allocate images at the beginning or
-	// reallocate them if the frame size is changed
-	if (mhi.size() != size)
-	{
-		mhi = Mat::zeros(size, CV_32F);
-		zplane = Mat::zeros(size, CV_8U);
-
-		buf[0] = Mat::zeros(size, CV_8U);
-		buf[1] = Mat::zeros(size, CV_8U);
-	}
-
-	cvtColor(img, buf[last], COLOR_BGR2GRAY); // convert frame to grayscale
-
-	int idx2 = (last + 1) % 2; // index of (last - (N-1))th frame
-	last = idx2;
-
-	Mat silh = buf[idx2];
-	absdiff(buf[idx1], buf[idx2], silh); // get difference between frames
-
-	threshold(silh, silh, diff_threshold, 1, THRESH_BINARY); // and threshold it
-	updateMotionHistory(silh, mhi, timestamp, MHI_DURATION); // update MHI
-
-	// convert MHI to blue 8u image
-	mhi.convertTo(mask, CV_8U, 255. / MHI_DURATION, (MHI_DURATION - timestamp)*255. / MHI_DURATION);
-
-	Mat planes[] = { mask, zplane, zplane };
-	merge(planes, 3, dst);
-
-	// calculate motion gradient orientation and valid orientation mask
-	calcMotionGradient(mhi, mask, orient, MAX_TIME_DELTA, MIN_TIME_DELTA, 3);
-
-	// segment motion: get sequence of motion components
-	// segmask is marked motion components map. It is not used further
-	regions.clear();
-	segmentMotion(mhi, segmask, regions, timestamp, MAX_TIME_DELTA);
-
-	// iterate through the motion components,
-	// One more iteration (i == -1) corresponds to the whole image (global motion)
-	for (i = -1; i < (int)regions.size(); i++) {
-
-		if (i < 0) { // case of the whole image
-			comp_rect = Rect(0, 0, size.width, size.height);
-			color = Scalar(255, 255, 255);
-			magnitude = 100;
-		}
-		else { // i-th motion component
-			comp_rect = regions[i];
-			if (comp_rect.width + comp_rect.height < 100) // reject very small components
-				continue;
-			color = Scalar(0, 0, 255);
-			magnitude = 30;
-		}
-
-		// select component ROI
-		Mat silh_roi = silh(comp_rect);
-		Mat mhi_roi = mhi(comp_rect);
-		Mat orient_roi = orient(comp_rect);
-		Mat mask_roi = mask(comp_rect);
-
-		// calculate orientation
-		angle = calcGlobalOrientation(orient_roi, mask_roi, mhi_roi, timestamp, MHI_DURATION);
-		angle = 360.0 - angle;  // adjust for images with top-left origin
-
-		count = norm(silh_roi, NORM_L1);; // calculate number of points within silhouette ROI
-
-		// check for the case of little motion
-		if (count < comp_rect.width*comp_rect.height * 0.05)
-			continue;
-
-		// draw a clock with arrow indicating the direction
-		center = Point((comp_rect.x + comp_rect.width / 2),
-			(comp_rect.y + comp_rect.height / 2));
-
-		circle(img, center, cvRound(magnitude*1.2), color, 3, 16, 0);
-		line(img, center, Point(cvRound(center.x + magnitude*cos(angle*CV_PI / 180)),
-			cvRound(center.y - magnitude*sin(angle*CV_PI / 180))), color, 3, 16, 0);
-	}
+    double timestamp = (double)clock() / CLOCKS_PER_SEC; // get current time in seconds
+    Size size = img.size();
+    int i, idx1 = last;
+    Rect comp_rect;
+    double count;
+    double angle;
+    Point center;
+    double magnitude;
+    Scalar color;
+
+    // allocate images at the beginning or
+    // reallocate them if the frame size is changed
+    if (mhi.size() != size)
+    {
+        mhi = Mat::zeros(size, CV_32F);
+        zplane = Mat::zeros(size, CV_8U);
+
+        buf[0] = Mat::zeros(size, CV_8U);
+        buf[1] = Mat::zeros(size, CV_8U);
+    }
+
+    cvtColor(img, buf[last], COLOR_BGR2GRAY); // convert frame to grayscale
+
+    int idx2 = (last + 1) % 2; // index of (last - (N-1))th frame
+    last = idx2;
+
+    Mat silh = buf[idx2];
+    absdiff(buf[idx1], buf[idx2], silh); // get difference between frames
+
+    threshold(silh, silh, diff_threshold, 1, THRESH_BINARY); // and threshold it
+    updateMotionHistory(silh, mhi, timestamp, MHI_DURATION); // update MHI
+
+    // convert MHI to blue 8u image
+    mhi.convertTo(mask, CV_8U, 255. / MHI_DURATION, (MHI_DURATION - timestamp)*255. / MHI_DURATION);
+
+    Mat planes[] = { mask, zplane, zplane };
+    merge(planes, 3, dst);
+
+    // calculate motion gradient orientation and valid orientation mask
+    calcMotionGradient(mhi, mask, orient, MAX_TIME_DELTA, MIN_TIME_DELTA, 3);
+
+    // segment motion: get sequence of motion components
+    // segmask is marked motion components map. It is not used further
+    regions.clear();
+    segmentMotion(mhi, segmask, regions, timestamp, MAX_TIME_DELTA);
+
+    // iterate through the motion components,
+    // One more iteration (i == -1) corresponds to the whole image (global motion)
+    for (i = -1; i < (int)regions.size(); i++) {
+
+        if (i < 0) { // case of the whole image
+            comp_rect = Rect(0, 0, size.width, size.height);
+            color = Scalar(255, 255, 255);
+            magnitude = 100;
+        }
+        else { // i-th motion component
+            comp_rect = regions[i];
+            if (comp_rect.width + comp_rect.height < 100) // reject very small components
+                continue;
+            color = Scalar(0, 0, 255);
+            magnitude = 30;
+        }
+
+        // select component ROI
+        Mat silh_roi = silh(comp_rect);
+        Mat mhi_roi = mhi(comp_rect);
+        Mat orient_roi = orient(comp_rect);
+        Mat mask_roi = mask(comp_rect);
+
+        // calculate orientation
+        angle = calcGlobalOrientation(orient_roi, mask_roi, mhi_roi, timestamp, MHI_DURATION);
+        angle = 360.0 - angle;  // adjust for images with top-left origin
+
+        count = norm(silh_roi, NORM_L1);; // calculate number of points within silhouette ROI
+
+        // check for the case of little motion
+        if (count < comp_rect.width*comp_rect.height * 0.05)
+            continue;
+
+        // draw a clock with arrow indicating the direction
+        center = Point((comp_rect.x + comp_rect.width / 2),
+            (comp_rect.y + comp_rect.height / 2));
+
+        circle(img, center, cvRound(magnitude*1.2), color, 3, 16, 0);
+        line(img, center, Point(cvRound(center.x + magnitude*cos(angle*CV_PI / 180)),
+            cvRound(center.y - magnitude*sin(angle*CV_PI / 180))), color, 3, 16, 0);
+    }
 }
 
 
 int main(int argc, char** argv)
 {
-	VideoCapture cap;
-
-	help();
-
-	if (argc == 1 || (argc == 2 && strlen(argv[1]) == 1 && isdigit(argv[1][0])))
-		cap.open(argc == 2 ? argv[1][0] - '0' : 0);
-	else if (argc == 2)
-		cap.open(argv[1]);
-
-	if (!cap.isOpened())
-	{
-		printf("Could not initialize video capture\n");
-		return 0;
-	}
-	buf.resize(2);
-	Mat image, motion;
-	for (;;)
-	{
-		cap >> image;
-		if (image.empty())
-			break;
-
-		update_mhi(image, motion, 30);
-		imshow("Image", image);
-		imshow("Motion", motion);
-
-		if (waitKey(10) >= 0)
-			break;
-	}
-
-	return 0;
+    VideoCapture cap;
+
+    help();
+
+    if (argc == 1 || (argc == 2 && strlen(argv[1]) == 1 && isdigit(argv[1][0])))
+        cap.open(argc == 2 ? argv[1][0] - '0' : 0);
+    else if (argc == 2)
+        cap.open(argv[1]);
+
+    if (!cap.isOpened())
+    {
+        printf("Could not initialize video capture\n");
+        return 0;
+    }
+    buf.resize(2);
+    Mat image, motion;
+    for (;;)
+    {
+        cap >> image;
+        if (image.empty())
+            break;
+
+        update_mhi(image, motion, 30);
+        imshow("Image", image);
+        imshow("Motion", motion);
+
+        if (waitKey(10) >= 0)
+            break;
+    }
+
+    return 0;
 }