1 /*
2 * starter_imagelist.cpp
3 *
4 * Created on: Nov 23, 2010
5 * Author: Ethan Rublee
6 *
7 * A starter sample for using opencv, load up an imagelist
8 * that was generated with imagelist_creator.cpp
9 * easy as CV_PI right?
10 */
11 #include "opencv2/imgcodecs.hpp"
12 #include "opencv2/highgui/highgui.hpp"
13 #include <iostream>
14 #include <vector>
15
16 using namespace cv;
17 using namespace std;
18
19 //hide the local functions in an unnamed namespace
20 namespace
21 {
help(char ** av)22 void help(char** av)
23 {
24 cout << "\nThis program gets you started being able to read images from a list in a file\n"
25 "Usage:\n./" << av[0] << " image_list.yaml\n"
26 << "\tThis is a starter sample, to get you up and going in a copy pasta fashion.\n"
27 << "\tThe program reads in an list of images from a yaml or xml file and displays\n"
28 << "one at a time\n"
29 << "\tTry running imagelist_creator to generate a list of images.\n"
30 "Using OpenCV version %s\n" << CV_VERSION << "\n" << endl;
31 }
32
readStringList(const string & filename,vector<string> & l)33 bool readStringList(const string& filename, vector<string>& l)
34 {
35 l.resize(0);
36 FileStorage fs(filename, FileStorage::READ);
37 if (!fs.isOpened())
38 return false;
39 FileNode n = fs.getFirstTopLevelNode();
40 if (n.type() != FileNode::SEQ)
41 return false;
42 FileNodeIterator it = n.begin(), it_end = n.end();
43 for (; it != it_end; ++it)
44 l.push_back((string)*it);
45 return true;
46 }
47
process(vector<string> images)48 int process(vector<string> images)
49 {
50 namedWindow("image", WINDOW_KEEPRATIO); //resizable window;
51 for (size_t i = 0; i < images.size(); i++)
52 {
53 Mat image = imread(images[i], IMREAD_GRAYSCALE); // do grayscale processing?
54 imshow("image",image);
55 cout << "Press a key to see the next image in the list." << endl;
56 waitKey(); // wait indefinitely for a key to be pressed
57 }
58 return 0;
59 }
60
61 }
62
main(int ac,char ** av)63 int main(int ac, char** av)
64 {
65
66 if (ac != 2)
67 {
68 help(av);
69 return 1;
70 }
71 std::string arg = av[1];
72 vector<string> imagelist;
73
74 if (!readStringList(arg,imagelist))
75 {
76 cerr << "Failed to read image list\n" << endl;
77 help(av);
78 return 1;
79 }
80
81 return process(imagelist);
82 }
83