我是OpenCV的新手，想要开发一个程序，它接受相机输入，并将其与一个物体的已知图像进行比较，该图像将作为.jpg图像输入，如果网络摄像头的输入与在图像中输入一定程度的准确度，然后应显示一些消息等，以便找到所需的对象。 例如：如果我在网络摄像头之前收到计算机电缆，则需要检测它并将其与我输入程序的计算机电缆图像进行比较。
我已经尝试了很多技巧，并发现模板匹配有效，如下面的链接所示--- Real-time template matching - OpenCV, C++
然而，在绘制矩形并获得roiImage之后......我想将它的可能性与我磁盘上的已知图像进行比较（在opencv工作目录中）。为此，我试图以HSV格式转换roiImg和我的其他图像，并根据算法得到4个值。
我试图将2个代码组合起来，但它似乎不起作用，因为roiImg是在运行时制作的，并且无法使用imread与其他2个图像进行比较。
#include <iostream>
#include "opencv2/opencv.hpp"
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/objdetect/objdetect.hpp>
#include <sstream>
using namespace cv;
using namespace std;
Point point1, point2; /* vertical points of the bounding box */
int drag = 0;
Rect rect; /* bounding box */
Mat img, roiImg; /* roiImg - the part of the image in the bounding box */
int select_flag = 0;
bool go_fast = false;
Mat mytemplate;
Mat src_base, hsv_base;
Mat src_test1, hsv_test1;
Mat src_test2, hsv_test2;
Mat hsv_half_down;
///------- template matching -----------------------------------------------------------------------------------------------
Mat TplMatch( Mat &img, Mat &mytemplate )
{
Mat result;
matchTemplate( img, mytemplate, result, CV_TM_SQDIFF_NORMED );
normalize( result, result, 0, 1, NORM_MINMAX, -1, Mat() );
return result;
}
///------- Localizing the best match with minMaxLoc ------------------------------------------------------------------------
Point minmax( Mat &result )
{
double minVal, maxVal;
Point minLoc, maxLoc, matchLoc;
minMaxLoc( result, &minVal, &maxVal, &minLoc, &maxLoc, Mat() );
matchLoc = minLoc;
return matchLoc;
}
///------- tracking --------------------------------------------------------------------------------------------------------
void track()
{
if (select_flag)
{
//roiImg.copyTo(mytemplate);
// select_flag = false;
go_fast = true;
}
// imshow( "mytemplate", mytemplate ); waitKey(0);
Mat result = TplMatch( img, mytemplate );
Point match = minmax( result );
rectangle( img, match, Point( match.x + mytemplate.cols , match.y + mytemplate.rows ), CV_RGB(255, 255, 255), 0.5 );
std::cout << "match: " << match << endl;
/// latest match is the new template
Rect ROI = cv::Rect( match.x, match.y, mytemplate.cols, mytemplate.rows );
roiImg = img( ROI );
roiImg.copyTo(mytemplate);
imshow( "roiImg", roiImg ); //waitKey(0);
//Compare the roiImg with a know image to calculate resemblence
/*Method Base - Base Base - Half Base - Test 1 Base - Test 2
Correlation 1.000000 0.930766 0.182073 0.120447
Chi-square 0.000000 4.940466 21.184536 49.273437
Intersection 24.391548 14.959809 3.889029 5.775088
Bhattacharyya 0.000000 0.222609 0.646576 0.801869
For the Correlation and Intersection methods, the higher the metric, the more accurate the match. As we can see,
the match base-base is the highest of all as expected. Also we can observe that the match base-half is the second best match (as we predicted).
For the other two metrics, the less the result, the better the match. We can observe that the matches between the test 1 and test 2 with respect
to the base are worse, which again, was expected.)*/
src_base = imread("roiImg");
src_test1 = imread("Samarth.jpg");
src_test2 = imread("Samarth2.jpg");
//double l2_norm = cvNorm( src_base, src_test1 );
/// Convert to HSV
cvtColor( src_base, hsv_base, COLOR_BGR2HSV );
cvtColor( src_test1, hsv_test1, COLOR_BGR2HSV );
cvtColor( src_test2, hsv_test2, COLOR_BGR2HSV );
hsv_half_down = hsv_base( Range( hsv_base.rows/2, hsv_base.rows - 1 ), Range( 0, hsv_base.cols - 1 ) );
/// Using 50 bins for hue and 60 for saturation
int h_bins = 50; int s_bins = 60;
int histSize[] = { h_bins, s_bins };
// hue varies from 0 to 179, saturation from 0 to 255
float h_ranges[] = { 0, 180 };
float s_ranges[] = { 0, 256 };
const float* ranges[] = { h_ranges, s_ranges };
// Use the o-th and 1-st channels
int channels[] = { 0, 1 };
/// Histograms
MatND hist_base;
MatND hist_half_down;
MatND hist_test1;
MatND hist_test2;
/// Calculate the histograms for the HSV images
calcHist( &hsv_base, 1, channels, Mat(), hist_base, 2, histSize, ranges, true, false );
normalize( hist_base, hist_base, 0, 1, NORM_MINMAX, -1, Mat() );
calcHist( &hsv_half_down, 1, channels, Mat(), hist_half_down, 2, histSize, ranges, true, false );
normalize( hist_half_down, hist_half_down, 0, 1, NORM_MINMAX, -1, Mat() );
calcHist( &hsv_test1, 1, channels, Mat(), hist_test1, 2, histSize, ranges, true, false );
normalize( hist_test1, hist_test1, 0, 1, NORM_MINMAX, -1, Mat() );
calcHist( &hsv_test2, 1, channels, Mat(), hist_test2, 2, histSize, ranges, true, false );
normalize( hist_test2, hist_test2, 0, 1, NORM_MINMAX, -1, Mat() );
/// Apply the histogram comparison methods
for( int i = 0; i < 4; i++ )
{
int compare_method = i;
double base_base = compareHist( hist_base, hist_base, compare_method );
double base_half = compareHist( hist_base, hist_half_down, compare_method );
double base_test1 = compareHist( hist_base, hist_test1, compare_method );
double base_test2 = compareHist( hist_base, hist_test2, compare_method );
printf( " Method [%d] Perfect, Base-Half, Base-Test(1), Base-Test(2) : %f, %f, %f, %f \n", i, base_base, base_half , base_test1, base_test2 );
}
printf( "Done \n" );
}
///------- MouseCallback function ------------------------------------------------------------------------------------------
void mouseHandler(int event, int x, int y, int flags, void *param)
{
if (event == CV_EVENT_LBUTTONDOWN && !drag)
{
/// left button clicked. ROI selection begins
point1 = Point(x, y);
drag = 1;
}
if (event == CV_EVENT_MOUSEMOVE && drag)
{
/// mouse dragged. ROI being selected
Mat img1 = img.clone();
point2 = Point(x, y);
rectangle(img1, point1, point2, CV_RGB(255, 0, 0), 3, 8, 0);
imshow("image", img1);
}
if (event == CV_EVENT_LBUTTONUP && drag)
{
point2 = Point(x, y);
rect = Rect(point1.x, point1.y, x - point1.x, y - point1.y);
drag = 0;
roiImg = img(rect);
roiImg.copyTo(mytemplate);
// imshow("MOUSE roiImg", roiImg); waitKey(0);
}
if (event == CV_EVENT_LBUTTONUP)
{
/// ROI selected
select_flag = 1;
drag = 0;
}
}
///------- Main() ----------------------------------------------------------------------------------------------------------
int main()
{
int k;
///open webcam
VideoCapture cap(0);
if (!cap.isOpened())
return 1;
/* ///open video file
VideoCapture cap;
cap.open( "Wildlife.wmv" );
if ( !cap.isOpened() )
{ cout << "Unable to open video file" << endl; return -1; }*/
/*
/// Set video to 320x240
cap.set(CV_CAP_PROP_FRAME_WIDTH, 320);
cap.set(CV_CAP_PROP_FRAME_HEIGHT, 240);*/
cap >> img;
GaussianBlur( img, img, Size(7,7), 3.0 );
imshow( "image", img );
while (1)
{
cap >> img;
if ( img.empty() )
break;
// Flip the frame horizontally and add blur
cv::flip( img, img, 1 );
GaussianBlur( img, img, Size(7,7), 3.0 );
if ( rect.width == 0 && rect.height == 0 )
cvSetMouseCallback( "image", mouseHandler, NULL );
else
track();
imshow("image", img);
// waitKey(100); k = waitKey(75);
k = waitKey(go_fast ? 30 : 10000);
if (k == 27)
break;
}
return 0;
}
答案 0 :(得分：0)
如果要在实时馈送中检测对象，则检测每个帧中的对象效率不高..第一次必须在必须跟踪对象后进行检测。 所以这个过程涉及检测和跟踪.. 对于检测你必须从其余部分分割对象，opencv提供了许多算法，用于根据颜色color based detection从背景中分割对象。除了颜色，你可以使用对象的形状从背景中分割对象shape based segmentation
你可以使用lk光流算法作为跟踪的起点。
另外，您可以使用模板匹配或camshift或内侧流跟踪器等来获得快速结果。所有上述算法将基于对象的比例变化和Feed的光照变化而有用。 opencv有上述算法的示例程序。