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You forgot to tell ros to "spin" in pub.cpp:

while (nh.ok()) 
 {
   pub.publish(ros_image);
   ros::spinOnce(); //Here is where the magic happens
   loop_rate.sleep();
 }

And I am not all that sure about your call to imread

cv::imread("/home/abi/Pictures/attachments/",CV_LOAD_IMAGE_COLOR);

You are passing a folder name instead of a path to an image. Should be something like

cv::imread("/home/abi/Pictures/attachments/someimage.jpg",CV_LOAD_IMAGE_COLOR);

You forgot to tell ros to "spin" in pub.cpp:

while (nh.ok()) 
 {
   pub.publish(ros_image);
   ros::spinOnce(); //Here is where the magic happens
   loop_rate.sleep();
 }

And I am not all that sure about your call to imread

cv::imread("/home/abi/Pictures/attachments/",CV_LOAD_IMAGE_COLOR);

You are passing a folder name instead of a path to an image. Should be something like

cv::imread("/home/abi/Pictures/attachments/someimage.jpg",CV_LOAD_IMAGE_COLOR);