男团台下看exid表演:OpenCV学习——眼部识别算法实现
来源:百度文库 编辑:偶看新闻 时间:2024/04/30 03:33:51
论文下载地址:
http://www.cs.bu.edu/techreports/pdf/2005-012-blink-detection.pdf
程序介绍:
This system is the enhancement of my previous Eye Tracking system, where this system
automatically locate the user's eye by detecting eye blinks. Motion analysis
techniques are used in this stage, followed by online creation of the open eye template.
The open eye template is used to locate the user's eye in the subsequent frames with
template matching. Blink detection is performed using motion analysis techniques.
Since the operation requires extensive amount of computation, the search region is
restricted in a small search window around the user's eye. This method will drastically
reduces the computation needed thus making the system running smoothly in real time.
Author: Nashruddin Amin
License: GPL
Website: http://nashruddin.com
See the complete tutorial at:
http://nashruddin.com/Real_Time_Eye_Tracking_and_Blink_Detection
Requirement
===========
This package requires the OpenCV library, freely available at:
http://sourceforge.net/projects/opencvlibrary
Compiling
=========
Compile as usual. See the OpenCV wiki (http://opencv.willowgarage.com) for info on how
to use various IDE with OpenCV.
Usage
=====
1. Run the program.
2. Blink your eyes. You will see 2 rectangles. The green rectangle labels
the object being tracked (your eye) and the red rectangle is the search window.
3. Move your head to see the eye tracking.
4. If you blink, the program will display the text 'blink!' in the window.
5. Press 'r' to repeat eye detection.
6. Press 'q' to quit.
Contact the author
==================
Feel free to contact me@nashruddin.com.
源程序:
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- /**
- * Real Time Eye Tracking and Blink Detection with OpenCV
- *
- * @author Nash
- * @license GPL
- * @website http://nashruddin.com
- *
- * See the tutorial at
- * http://nashruddin.com/Real_Time_Eye_Tracking_and_Blink_Detection
- */
- #include
- #include "cv.h"
- #include "highgui.h"
- #define FRAME_WIDTH 240
- #define FRAME_HEIGHT 180
- #define TPL_WIDTH 16
- #define TPL_HEIGHT 12
- #define WIN_WIDTH TPL_WIDTH * 2
- #define WIN_HEIGHT TPL_HEIGHT * 2
- #define TM_THRESHOLD 0.4
- #define STAGE_INIT 1
- #define STAGE_TRACKING 2
- #define POINT_TL(r) cvPoint(r.x, r.y)
- #define POINT_BR(r) cvPoint(r.x + r.width, r.y + r.height)
- #define POINTS(r) POINT_TL(r), POINT_BR(r)
- #define DRAW_RECTS(f, d, rw, ro) /
- { /
- cvRectangle(f, POINTS(rw), CV_RGB(255, 0, 0), 1, 8, 0); /
- cvRectangle(f, POINTS(ro), CV_RGB(0, 255, 0), 1, 8, 0); /
- cvRectangle(d, POINTS(rw), cvScalarAll(255), 1, 8, 0); /
- cvRectangle(d, POINTS(ro), cvScalarAll(255), 1, 8, 0); /
- }
- #define DRAW_TEXT(f, t, d, use_bg) /
- if (d) /
- { /
- CvSize _size; /
- cvGetTextSize(t, &font, &_size, NULL); /
- if (use_bg) /
- { /
- cvRectangle(f, cvPoint(0, f->height), /
- cvPoint(_size.width + 5, /
- f->height - _size.height * 2), /
- CV_RGB(255, 0, 0), CV_FILLED, 8, 0); /
- } /
- cvPutText(f, t, cvPoint(2, f->height - _size.height / 2), /
- &font, CV_RGB(255,255,0)); /
- d--; /
- }
- CvCapture* capture;
- IplImage* frame, * gray, * prev, * diff, * tpl;
- CvMemStorage* storage;
- IplConvKernel* kernel;
- CvFont font;
- char* wnd_name = "video";
- char* wnd_debug = "diff";
- int get_connected_components(IplImage* img, IplImage* prev, CvRect window, CvSeq** comp);
- int is_eye_pair(CvSeq* comp, int num, CvRect* eye);
- int locate_eye(IplImage* img, IplImage* tpl, CvRect* window, CvRect* eye);
- int is_blink(CvSeq* comp, int num, CvRect window, CvRect eye);
- void delay_frames(int nframes);
- void init();
- void exit_nicely(char* msg);
- int
- main(int argc, char** argv)
- {
- CvSeq* comp = 0;
- CvRect window, eye;
- int key, nc, found;
- int text_delay, stage = STAGE_INIT;
- init();
- while (key != 'q')
- {
- frame = cvQueryFrame(capture);
- if (!frame)
- exit_nicely("cannot query frame!");
- frame->origin = 0;
- if (stage == STAGE_INIT)
- window = cvRect(0, 0, frame->width, frame->height);
- cvCvtColor(frame, gray, CV_BGR2GRAY);
- nc = get_connected_components(gray, prev, window, &comp);
- if (stage == STAGE_INIT && is_eye_pair(comp, nc, &eye))
- {
- delay_frames(5);
- cvSetImageROI(gray, eye);
- cvCopy(gray, tpl, NULL);
- cvResetImageROI(gray);
- stage = STAGE_TRACKING;
- text_delay = 10;
- }
- if (stage == STAGE_TRACKING)
- {
- found = locate_eye(gray, tpl, &window, &eye);
- if (!found || key == 'r')
- stage = STAGE_INIT;
- if (is_blink(comp, nc, window, eye))
- text_delay = 10;
- DRAW_RECTS(frame, diff, window, eye);
- DRAW_TEXT(frame, "blink!", text_delay, 1);
- }
- cvShowImage(wnd_name, frame);
- cvShowImage(wnd_debug, diff);
- prev = cvClone(gray);
- key = cvWaitKey(15);
- }
- exit_nicely(NULL);
- }
- /**
- * This is the wrapper function for cvFindContours
- *
- * @param IplImage* img the current grayscaled frame
- * @param IplImage* prev previously saved frame
- * @param CvRect window search within this window
- * @param CvSeq** comp output parameter, will contain the connected components
- * @return int the number of connected components
- */
- int
- get_connected_components(IplImage* img, IplImage* prev, CvRect window, CvSeq** comp)
- {
- IplImage* _diff;
- cvZero(diff);
- /* apply search window to images */
- cvSetImageROI(img, window);
- cvSetImageROI(prev, window);
- cvSetImageROI(diff, window);
- /* motion analysis */
- cvSub(img, prev, diff, NULL);
- cvThreshold(diff, diff, 5, 255, CV_THRESH_BINARY);
- cvMorphologyEx(diff, diff, NULL, kernel, CV_MOP_OPEN, 1);
- /* reset search window */
- cvResetImageROI(img);
- cvResetImageROI(prev);
- cvResetImageROI(diff);
- _diff = cvClone(diff);
- /* get connected components */
- int nc = cvFindContours(_diff, storage, comp, sizeof(CvContour),
- CV_RETR_CCOMP, CV_CHAIN_APPROX_SIMPLE, cvPoint(0,0));
- cvClearMemStorage(storage);
- cvReleaseImage(&_diff);
- return nc;
- }
- /**
- * Experimentally-derived heuristics to determine whether
- * the connected components are eye pair or not.
- *
- * @param CvSeq* comp the connected components
- * @param int num the number of connected components
- * @param CvRect* eye output parameter, will contain the location of the
- * first component
- * @return int '1' if eye pair, '0' otherwise
- */
- int
- is_eye_pair(CvSeq* comp, int num, CvRect* eye)
- {
- if (comp == 0 || num != 2)
- return 0;
- CvRect r1 = cvBoundingRect(comp, 1);
- comp = comp->h_next;
- if (comp == 0)
- return 0;
- CvRect r2 = cvBoundingRect(comp, 1);
- /* the width of the components are about the same */
- if (abs(r1.width - r2.width) >= 5)
- return 0;
- /* the height f the components are about the same */
- if (abs(r1.height - r2.height) >= 5)
- return 0;
- /* vertical distance is small */
- if (abs(r1.y - r2.y) >= 5)
- return 0;
- /* reasonable horizontal distance, based on the components' width */
- int dist_ratio = abs(r1.x - r2.x) / r1.width;
- if (dist_ratio < 2 || dist_ratio > 5)
- return 0;
- /* get the centroid of the 1st component */
- CvPoint point = cvPoint(
- r1.x + (r1.width / 2),
- r1.y + (r1.height / 2)
- );
- /* return eye boundaries */
- *eye = cvRect(
- point.x - (TPL_WIDTH / 2),
- point.y - (TPL_HEIGHT / 2),
- TPL_WIDTH,
- TPL_HEIGHT
- );
- return 1;
- }
- /**
- * Locate the user's eye with template matching
- *
- * @param IplImage* img the source image
- * @param IplImage* tpl the eye template
- * @param CvRect* window search within this window,
- * will be updated with the recent search window
- * @param CvRect* eye output parameter, will contain the current
- * location of user's eye
- * @return int '1' if found, '0' otherwise
- */
- int
- locate_eye(IplImage* img, IplImage* tpl, CvRect* window, CvRect* eye)
- {
- IplImage* tm;
- CvRect win;
- CvPoint minloc, maxloc, point;
- double minval, maxval;
- int w, h;
- /* get the centroid of eye */
- point = cvPoint(
- (*eye).x + (*eye).width / 2,
- (*eye).y + (*eye).height / 2
- );
- /* setup search window
- replace the predefined WIN_WIDTH and WIN_HEIGHT above
- for your convenient */
- win = cvRect(
- point.x - WIN_WIDTH / 2,
- point.y - WIN_HEIGHT / 2,
- WIN_WIDTH,
- WIN_HEIGHT
- );
- /* make sure that the search window is still within the frame */
- if (win.x < 0)
- win.x = 0;
- if (win.y < 0)
- win.y = 0;
- if (win.x + win.width > img->width)
- win.x = img->width - win.width;
- if (win.y + win.height > img->height)
- win.y = img->height - win.height;
- /* create new image for template matching result where:
- width = W - w + 1, and
- height = H - h + 1 */
- w = win.width - tpl->width + 1;
- h = win.height - tpl->height + 1;
- tm = cvCreateImage(cvSize(w, h), IPL_DEPTH_32F, 1);
- /* apply the search window */
- cvSetImageROI(img, win);
- /* template matching */
- cvMatchTemplate(img, tpl, tm, CV_TM_SQDIFF_NORMED);
- cvMinMaxLoc(tm, &minval, &maxval, &minloc, &maxloc, 0);
- /* release things */
- cvResetImageROI(img);
- cvReleaseImage(&tm);
- /* only good matches */
- if (minval > TM_THRESHOLD)
- return 0;
- /* return the search window */
- *window = win;
- /* return eye location */
- *eye = cvRect(
- win.x + minloc.x,
- win.y + minloc.y,
- TPL_WIDTH,
- TPL_HEIGHT
- );
- return 1;
- }
- int
- is_blink(CvSeq* comp, int num, CvRect window, CvRect eye)
- {
- if (comp == 0 || num != 1)
- return 0;
- CvRect r1 = cvBoundingRect(comp, 1);
- /* component is within the search window */
- if (r1.x < window.x)
- return 0;
- if (r1.y < window.y)
- return 0;
- if (r1.x + r1.width > window.x + window.width)
- return 0;
- if (r1.y + r1.height > window.y + window.height)
- return 0;
- /* get the centroid of eye */
- CvPoint pt = cvPoint(
- eye.x + eye.width / 2,
- eye.y + eye.height / 2
- );
- /* component is located at the eye's centroid */
- if (pt.x <= r1.x || pt.x >= r1.x + r1.width)
- return 0;
- if (pt.y <= r1.y || pt.y >= r1.y + r1.height)
- return 0;
- return 1;
- }
- /**
- * Delay for the specified frame count. I have to write this custom
- * delay function for these reasons:
- * - usleep() is not available in Windows
- * - usleep() and Sleep() will freeze the video for the given interval
- */
- void
- delay_frames(int nframes)
- {
- int i;
- for (i = 0; i < nframes; i++)
- {
- frame = cvQueryFrame(capture);
- if (!frame)
- exit_nicely("cannot query frame");
- cvShowImage(wnd_name, frame);
- if (diff)
- cvShowImage(wnd_debug, diff);
- cvWaitKey(30);
- }
- }
- /**
- * Initialize images, memory, and windows
- */
- void
- init()
- {
- char* msg[] = { "Blink Detection 1.0",
- "Copyright (c) 2009",
- "http://nashruddin.com",
- "Press 'q' to quit...",
- "Press 'r' to restart...",
- "Have fun!" };
- int delay, i;
- capture = cvCaptureFromCAM(0);
- if (!capture)
- exit_nicely("Cannot initialize camera!");
- cvSetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH, FRAME_WIDTH);
- cvSetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT, FRAME_HEIGHT);
- frame = cvQueryFrame(capture);
- if (!frame)
- exit_nicely("cannot query frame!");
- cvInitFont(&font, CV_FONT_HERSHEY_SIMPLEX, 0.4, 0.4, 0, 1, 8);
- cvNamedWindow(wnd_name, 1);
- for (delay = 20, i = 0; i < 6; i++, delay = 20)
- while (delay)
- {
- frame = cvQueryFrame(capture);
- if (!frame)
- exit_nicely("cannot query frame!");
- DRAW_TEXT(frame, msg[i], delay, 0);
- cvShowImage(wnd_name, frame);
- cvWaitKey(30);
- }
- storage = cvCreateMemStorage(0);
- if (!storage)
- exit_nicely("cannot allocate memory storage!");
- kernel = cvCreateStructuringElementEx(3, 3, 1, 1, CV_SHAPE_CROSS, NULL);
- gray = cvCreateImage(cvGetSize(frame), 8, 1);
- prev = cvCreateImage(cvGetSize(frame), 8, 1);
- diff = cvCreateImage(cvGetSize(frame), 8, 1);
- tpl = cvCreateImage(cvSize(TPL_WIDTH, TPL_HEIGHT), 8, 1);
- if (!kernel || !gray || !prev || !diff || !tpl)
- exit_nicely("system error.");
- gray->origin = frame->origin;
- prev->origin = frame->origin;
- diff->origin = frame->origin;
- cvNamedWindow(wnd_debug, 1);
- }
- /**
- * This function provides a way to exit nicely
- * from the system
- *
- * @param char* msg error message to display
- */
- void
- exit_nicely(char* msg)
- {
- cvDestroyAllWindows();
- if (capture)
- cvReleaseCapture(&capture);
- if (gray)
- cvReleaseImage(&gray);
- if (prev)
- cvReleaseImage(&prev);
- if (diff)
- cvReleaseImage(&diff);
- if (tpl)
- cvReleaseImage(&tpl);
- if (storage)
- cvReleaseMemStorage(&storage);
- if (msg != NULL)
- {
- fprintf(stderr, msg);
- fprintf(stderr, "/n");
- exit(1);
- }
- exit(0);
- }