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garystafford/testfps.cpp

Last active Dec 29, 2015
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Repository for my blog post, 'Object Tracking on the Raspberry Pi with C++, OpenCV, and cvBlob': http://wp.me/p1RD28-yW
/*
* File: testfps.cpp
* Author: Gary Stafford
* Description: Test the fps of a webcam using OpenCV
* Created: February 3, 2013
*/
#include <cv.h>
#include <highgui.h>
#include <time.h>
#include <stdio.h>
#include "testfps.hpp"
using namespace std;
// Test 1: OpenCV (w/ webcam feed)
int TestFpsNoVideo(int captureWidth, int captureHeight) {
IplImage* frame;
CvCapture* capture = cvCreateCameraCapture(-1);
cvSetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH, captureWidth);
cvSetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT, captureHeight);
time_t start, end;
double fps, sec;
int counter = 0;
char k;
time(&start);
while (1) {
frame = cvQueryFrame(capture);
time(&end);
++counter;
sec = difftime(end, start);
fps = counter / sec;
printf("FPS = %.2f\n", fps);
if (!frame) {
printf("Error");
break;
}
k = cvWaitKey(10)&0xff;
switch (k) {
case 27:
case 'q':
case 'Q':
break;
}
}
cvReleaseCapture(&capture);
return 0;
}
// Test 2: OpenCV (w/o webcam feed)
int TestFpsShowVideo(int captureWidth, int captureHeight) {
IplImage* frame;
CvCapture* capture = cvCreateCameraCapture(-1);
cvSetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH, captureWidth);
cvSetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT, captureHeight);
cvNamedWindow("Webcam Preview", CV_WINDOW_AUTOSIZE);
cvMoveWindow("Webcam Preview", 300, 200);
time_t start, end;
double fps, sec;
int counter = 0;
char k;
time(&start);
while (1) {
frame = cvQueryFrame(capture);
time(&end);
++counter;
sec = difftime(end, start);
fps = counter / sec;
printf("FPS = %.2f\n", fps);
if (!frame) {
printf("Error");
break;
}
cvShowImage("Webcam Preview", frame);
k = cvWaitKey(10)&0xff;
switch (k) {
case 27:
case 'q':
case 'Q':
break;
}
}
cvDestroyWindow("Webcam Preview");
cvReleaseCapture(&capture);
return 0;
}
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