modified data matrix detection interface (that does not use any new data structures). Added Python sample for data matrix detection. Ticket #1664
This commit is contained in:
Vadim Pisarevsky
@@ -21,80 +21,81 @@ using namespace std;
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//hide the local functions in an anon namespace
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namespace
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{
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void help(char** av)
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{
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cout << "\nThis program justs gets you started reading images from video\n"
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"Usage:\n./" << av[0] << " <video device number>\n" << "q,Q,esc -- quit\n"
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<< "space -- save frame\n\n"
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<< "\tThis is a starter sample, to get you up and going in a copy pasta fashion\n"
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<< "\tThe program captures frames from a camera connected to your computer.\n"
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<< "\tTo find the video device number, try ls /dev/video* \n"
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<< "\tYou may also pass a video file, like my_vide.avi instead of a device number"
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<< "\n"
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<< "DATA:\n"
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<< "Generate a datamatrix from from http://datamatrix.kaywa.com/ \n"
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<< " NOTE: This only handles strings of len 3 or less\n"
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<< " Resize the screen to be large enough for your camera to see, and it should find an read it.\n\n"
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<< endl;
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}
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int process(VideoCapture& capture)
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{
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std::vector<DataMatrixCode> codes;
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int n = 0;
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char filename[200];
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string window_name = "video | q or esc to quit";
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cout << "press space to save a picture. q or esc to quit" << endl;
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namedWindow(window_name, CV_WINDOW_KEEPRATIO); //resizable window;
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Mat frame;
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for (;;)
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{
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capture >> frame;
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if (frame.empty())
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break;
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cv::Mat gray;
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cv::cvtColor(frame,gray,CV_RGB2GRAY);
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findDataMatrix(gray, codes);
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drawDataMatrixCodes(codes, frame);
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imshow(window_name, frame);
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char key = (char) waitKey(5); //delay N millis, usually long enough to display and capture input
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switch (key)
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void help(char** av)
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{
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case 'q':
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case 'Q':
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case 27: //escape key
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return 0;
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case ' ': //Save an image
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sprintf(filename, "filename%.3d.jpg", n++);
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imwrite(filename, frame);
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cout << "Saved " << filename << endl;
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break;
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default:
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break;
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cout << "\nThis program justs gets you started reading images from video\n"
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"Usage:\n./" << av[0] << " <video device number>\n" << "q,Q,esc -- quit\n"
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<< "space -- save frame\n\n"
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<< "\tThis is a starter sample, to get you up and going in a copy pasta fashion\n"
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<< "\tThe program captures frames from a camera connected to your computer.\n"
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<< "\tTo find the video device number, try ls /dev/video* \n"
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<< "\tYou may also pass a video file, like my_vide.avi instead of a device number"
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<< "\n"
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<< "DATA:\n"
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<< "Generate a datamatrix from from http://datamatrix.kaywa.com/ \n"
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<< " NOTE: This only handles strings of len 3 or less\n"
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<< " Resize the screen to be large enough for your camera to see, and it should find an read it.\n\n"
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<< endl;
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}
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}
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return 0;
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}
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int process(VideoCapture& capture)
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{
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int n = 0;
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char filename[200];
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string window_name = "video | q or esc to quit";
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cout << "press space to save a picture. q or esc to quit" << endl;
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namedWindow(window_name, CV_WINDOW_KEEPRATIO); //resizable window;
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Mat frame;
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for (;;)
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{
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capture >> frame;
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if (frame.empty())
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break;
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cv::Mat gray;
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cv::cvtColor(frame,gray,CV_RGB2GRAY);
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vector<string> codes;
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Mat corners;
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findDataMatrix(gray, codes, corners);
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drawDataMatrixCodes(frame, codes, corners);
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imshow(window_name, frame);
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char key = (char) waitKey(5); //delay N millis, usually long enough to display and capture input
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switch (key)
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{
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case 'q':
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case 'Q':
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case 27: //escape key
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return 0;
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case ' ': //Save an image
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sprintf(filename, "filename%.3d.jpg", n++);
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imwrite(filename, frame);
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cout << "Saved " << filename << endl;
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break;
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default:
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break;
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}
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}
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return 0;
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}
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}
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int main(int ac, char** av)
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{
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if (ac != 2)
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{
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help(av);
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return 1;
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}
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std::string arg = av[1];
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VideoCapture capture(arg); //try to open string, this will attempt to open it as a video file
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if (!capture.isOpened()) //if this fails, try to open as a video camera, through the use of an integer param
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capture.open(atoi(arg.c_str()));
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if (!capture.isOpened())
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{
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cerr << "Failed to open a video device or video file!\n" << endl;
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help(av);
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return 1;
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}
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return process(capture);
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if (ac != 2)
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{
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help(av);
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return 1;
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}
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std::string arg = av[1];
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VideoCapture capture(arg); //try to open string, this will attempt to open it as a video file
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if (!capture.isOpened()) //if this fails, try to open as a video camera, through the use of an integer param
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capture.open(atoi(arg.c_str()));
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if (!capture.isOpened())
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{
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cerr << "Failed to open a video device or video file!\n" << endl;
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help(av);
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return 1;
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}
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return process(capture);
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}
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68
samples/python2/video_dmtx.py
Normal file
68
samples/python2/video_dmtx.py
Normal file
@@ -0,0 +1,68 @@
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help='''
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Data matrix detector sample.
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Usage:
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video_dmtx {<video device number>|<video file name>}
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Generate a datamatrix from from http://datamatrix.kaywa.com/ and print it out.
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NOTE: This only handles data matrices, generated for text strings of max 3 characters
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Resize the screen to be large enough for your camera to see, and it should find an read it.
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Keyboard shortcuts:
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q or ESC - exit
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space - save current image as datamatrix<frame_number>.jpg
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'''
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import cv2
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import numpy as np
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import sys
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def data_matrix_demo(cap):
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window_name = "Data Matrix Detector"
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frame_number = 0
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need_to_save = False
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while 1:
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ret, frame = cap.read()
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if not ret:
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break
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gray = cv2.cvtColor(frame, cv2.COLOR_RGB2GRAY)
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codes, corners, dmtx = cv2.findDataMatrix(gray)
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cv2.drawDataMatrixCodes(frame, codes, corners)
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cv2.imshow(window_name, frame)
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key = cv2.waitKey(30)
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c = chr(key & 255)
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if c in ['q', 'Q', chr(27)]:
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break
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if c == ' ':
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need_to_save = True
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if need_to_save and codes:
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filename = ("datamatrix%03d.jpg" % frame_number)
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cv2.imwrite(filename, frame)
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print "Saved frame to " + filename
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need_to_save = False
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frame_number += 1
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if __name__ == '__main__':
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print help
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if len(sys.argv) == 1:
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cap = cv2.VideoCapture(0)
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else:
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cap = cv2.VideoCapture(sys.argv[1])
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if not cap.isOpened():
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cap = cv2.VideoCapture(int(sys.argv[1]))
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if not cap.isOpened():
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print 'Cannot initialize video capture'
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sys.exit(-1)
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data_matrix_demo(cap)
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