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srv / viso2

A ROS wrapper for libviso2, a library for visual odometry
http://ros.org/wiki/viso2
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Synchronization Problem #22

Closed aba92 closed 9 years ago

aba92 commented 9 years ago

Hi,

I've been trying to run your code with command,

rosrun viso2_ros stereo_odometer stereo:=vizzy image:=image_rect_color _approximimate_sync:=True

but I'm getting the following warning:

[ WARN] [1426508496.056623314, 225.349000000]: [stereo_processor] Low number of synchronized left/right/left_info/right_info tuples received. Left images received: 16 (topic '/vizzy/left/image_rect_color') Right images received: 15 (topic '/vizzy/right/image_rect_color') Left camera info received: 16 (topic '/vizzy/left/camera_info') Right camera info received: 16 (topic '/vizzy/right/camera_info') Synchronized tuples: 0 Possible issues: * stereo_image_proc is not running. Does rosnode info /stereo_odometer show any connections? * The cameras are not synchronized. Try restarting the node with parameter _approximate_sync:=True * The network is too slow. One or more images are dropped from each tuple. Try restarting the node, increasing parameter 'queue_size' (currently 5)

I don't know how to synchronize the camera's topics, I tried several codes that I found in ROS answers but I wasn't successful. The link to code:

http://answers.ros.org/question/9705/synchronizer-and-image_transportsubscriber/

Can you help me friend. Thank so much.

plnegre commented 9 years ago

The code you posted is used to check for synchronazed images, not to make the images synchonize, and is the same that viso2 has inside. Please read: http://wiki.ros.org/message_filters

If viso2 does not receive synchronized images, is a problem of your camera driver. Make sure that your driver is setting the field "header.timestamp" properly for each image topic.