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webcam-snapshots.cpp
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webcam-snapshots.cpp
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/*
* Copyright (C) 2017 Martin Lambers <marlam@marlam.de>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/* The purpose of this tool is to take snapshots from your webcam for calibration.
*
* Do the following:
* - Print the OpenCV calibration chessboard
* http://docs.opencv.org/2.4/_downloads/pattern.png
* - Start this tool
* - Hold the chessboard into the view, make a snapshot by pressing space bar
* - Make at least 10 such snapshots with the chessboard pattern at different
* positions and angles (but still facing the camera approximately frontal)
* - Run the OpenCV python sample calibrate.py:
* ./calibrate.py 'webcam-*.ppm'
* - Check the output images for correctness
* - Put the reported camera intrinsics into environment variables, preferably
* in .profile or .bashrc:
* export WEBCAM_INTRINSIC_PARAMETERS="636.68,637.73,323.22,231.55"
* export WEBCAM_DISTORTION_COEFFICIENTS="-0.0027493,0.11596,-0.0000753,0.0054066,-0.691798"
* - The webcam head tracker will use these environment variables instead of
* guessing the values.
*/
#include <cstdio>
#include <opencv2/highgui/highgui.hpp>
int main(void)
{
cv::VideoCapture capture(0);
if (!capture.isOpened()) {
fprintf(stderr, "cannot find usable camera\n");
return 1;
}
cv::Mat frame;
char filename[] = "webcam-0000.ppm";
int i = 0;
for (;;) {
capture >> frame;
cv::imshow("webcam", frame);
int key = cv::waitKey(10);
if (key == 27 || key == 'q') {
break;
} else if (key == ' ') {
snprintf(filename , sizeof(filename), "webcam-%04d.ppm", i);
fprintf(stderr, "saving %s\n", filename);
cv::imwrite(filename, frame);
i++;
if (i == 9999)
break;
}
}
return 0;
}