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Hi

You could write a node that publishes your images one after the other and then launch that node from a launch file.

To do that you can probably follow this tutorial and modify it to loop through your images.

I haven't tested any of this but I guess you would have to change cv::Mat image = cv::imread(argv[1], CV_LOAD_IMAGE_COLOR); to something like :

cv::Mat image1 = cv::imread(path/to/image1, CV_LOAD_IMAGE_COLOR);

cv::Mat image2 = cv::imread(path/to/image2, CV_LOAD_IMAGE_COLOR);

cv::Mat image3 = cv::imread(path/to/image3, CV_LOAD_IMAGE_COLOR);

and then change msg at a regular time interval in the loop