Blaise, The output to both rostopic hz /stereo/left/image_rect_color (image_view_proc) rostopic hz /stereo/left/image_raw (image_raw) in exposure 5, is something as below Rate: x.xxx max: xxx min: xxx .... no new message no new message no new message no new message Rate: x.xxx max: xxx min: xxx .... no new message no new message no new message no new message in exposure 0.5, is something as below Rate: x.xxx max: xxx min: xxx .... Rate: x.xxx max: xxx min: xxx .... 1 PC run just roscore + 1 PC run just camera drivers and image_proc + 2 net prosilical cameras (640x480) + 1 desktop to run rostopics all connected through a network with two hubs is hardly to say limitation in hardware, Could it be a problem in configuration? Reza, -----Original Message----- From: ros-users-bounces@code.ros.org [mailto:ros-users-bounces@code.ros.org] On Behalf Of Blaise Gassend Sent: 15 February 2011 17:40 To: User discussions Subject: Re: [ros-users] stereo image sync What do you mean that you get one message out of 5? Do you mean that you see messages on the image_raw topic but not on the output of stereo_image_proc, or does it mean that the images aren't even arriving on the image_raw topic? In any case, resource limitations of various types can cause a lower than expected frame rate: - CPU overload can cause frames to be dropped. - Insufficient lighting can cause the exposure time to be long, and the frame rate to be lower than requested. - Insufficient network bandwidth can limit how many frames get over the network (seems unlikely in your case). Hard to say more without knowing more about your system. On Tue, Feb 15, 2011 at 2:47 AM, Asghari Oskoei, Mohammadreza wrote: > > > Hi, > > I setup a pair of prosilica camera, in mode 640x480 in two exposure rates 5 > and 0.5 , > > When I subscribe to their topics by either "rostopic hz > /stereo/left/image_rect_color" or "rostopic hz /stereo/left/image_raw" > > > > In exposure rate 0.5, receive all messages without missing any  and then it > repeats again > > In exposure rate 5, receive just 1 message and miss other 4 messages then it > repeats again > > > > I tried this in different rates and found out that I just can receive two > messages (one left and one right) per second (or per ROS refresh rate), and > any more messages would be missed by ROS. > > > > The other point is that when I run stereo_image_proc  it crashes as soon as > starting to subscribe to it by either stereo_view or face_detector. > > > > Anyone can help, please? > > Reza, > > _______________________________________________ > ros-users mailing list > ros-users@code.ros.org > https://code.ros.org/mailman/listinfo/ros-users > > _______________________________________________ ros-users mailing list ros-users@code.ros.org https://code.ros.org/mailman/listinfo/ros-users