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save subscribed image when service is called

asked 2012-08-07 16:31:26 -0500

atsushi_tsuda gravatar image

Hi all,

Is there any package to save subscribed image when service is called?

I also want to set filename format ("frame%04i.jpg", for example) to get sequential numbered image and save directory with rosparam.

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answered 2013-11-12 22:13:53 -0500

timster gravatar image

I recommend using OpenCV for writing images. Generate a file name like this:

std::ostringstream jpg_filename;
jpg_filename << file_path << "frame" << count << ".jpg";
++count;

I guess there should be a variant to create a printf style formatted string too, but I haven't tried anything.

If you are not doing so already, you need to convert your sensor_msgs::Image to cv::Mat format. There is a nice tutorial for that.

And finally save your image.

cv::imwrite(jpg_filename.str(), your_cv_mat);

Make sure to define OpenCV as a dependency and include the right headers:

#include <fstream>
#include <opencv2/highgui/highgui.hpp>

Best

Tim

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Small note: Boost.Format should be used over printf in C++.

Thomas gravatar image Thomas  ( 2013-11-13 16:54:51 -0500 )edit

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Asked: 2012-08-07 16:31:26 -0500

Seen: 162 times

Last updated: Nov 12 '13