Questions tagged [approximatetime]

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Not getting any output with python message_filter ApproximateTimeSynchronizer

I am trying to project 3d bounding box detected on a point cloud data to Image. I am using message filters to subscribe to image and detection topic. when I run the node i get the debug message on ...
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Subscribe to geometry_msgs/TransformStamped (tf) Message with message_filters ApproximateTime subscriber

I am trying to use a message_filters::sync::ApproximateTime subscriber in a C++ node that must subscribe to 2 custom messages (which have a Header each), nav_msgs/OccupancyGrid Message, and a tf/...
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Compilation issues with PCL and message_filters: ; cannot bind non-const lvalue

Compiler: gcc9.4.0 Arch: Ubuntu20.04/AMD64 PCL: 1.10 ROS Galactic I've got two errors which I believe are hindering me from compiling my code here successfully. The first is affecting my attempt to ...
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ApproximateTime policy not working

Hello I'm trying to synchronize 2 topic(color/image and semantic_image) but unfortantelly the callback function doesn't work , here is my code ; ...
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ApproximateTime not working with nodelets

Hi, I have a nodelet that publishes a few topics and another nodelet that subscribes the topics and republishes a custom topic with all the synchronized messages. If I start the two nodelets in two ...
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roscpp message_filters ApproximateTime API questions

Hi, I have two questions regarding using message_filters ApproximateTimePolicy. From the example, it is not quite clear how I can specify the delay (in seconds) between messages that they can be ...
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[Solved] C++: ApproximateTime with more than two topics?

Hi @all, short version: Could you please provide me with a full version for synchronizing up to eight image topics with ROS? long version: I am currently trying to get my Synchronizer to work. Thanks ...
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How to synchronize two topics without message loss?

Hi all, Context In order to assess the performance of AMCL, I am trying to synchronize two topics : The estimated pose from AMCL output The scan from the laser range ...
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While using message_filters to do the time synchronization,but it cannot enter into the callback function

I am using sync_policies::ApproximateTime in message_filter to do the PointCloud2 and LaserScan time synchronization, but the problem is it cannot enter into the callback function of...
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Synchronizing multiple topics and re-publish them

Hi, I am trying to synchronize robot joints and force/torque sensor message. So I've tried to use message_filters::sync_policies::ApproximateTime to do so, however, it does not seem to be working. I ...
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Simple approx time sync example errors

I am using Hydro on Ubuntu 12.04. I am attempting to make an approximate time synchronizer for my application. I created a simple example to try to get it to work but I am running into the three ...
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Problem using callback with multiple arguments via ApproximateTime synchronizer

I have always no success in using callback with multiple arguments (in my use case here is three arguments) be it using exact time synchronizer or approximate one. My implementation is like below: <...
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ApproximateTime Synchronizer executed by multiple nodes: collision?

Hi all, Right now I have a node RGBDImageProc that does some processing on the incoming data from an RGBD camera. It's a slightly modified version of the one here: ...
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How can I post the time that has passed during a process?

I would like to know how much time has gone by while performing a certain process. As an example I have used the Publisher/Subscriber tutorial code from ros.org with some minor modifications. ...
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How to use ApproximateTime in python

Hi all, I'm trying to synchronize (approximately since the stamps of the topics are different) 4 topics. I have looked at the ApproximateTime example here: http://answers.ros.org/question/60903/...
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Message filter using Approximate time policy. callback function called once

I want to access images and ultrasound reading from my ardrone parrot. To get readings in synchronized way i tried using message filter with approximate time policy. ...
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Using Approximate Time Sync - how does it work?

Greetings, take this for instance: ...
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TimeSynchronizer Callback problem

I have a problem using the TimeSynchronizer. I added sub1 and sub2 to test if there is a with the subscriber, but in both cases the callbacks test_callback and test_callback2 are called. Only the ...
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libboost error during linking

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Synchronizing 3 messages: Build Errors

Greetings. I am attempting to use the ApproximateTime policy for synchronizing 3 messages containing the types with names: string type, int32 value. At the call, Synchronize sync(syncPolicy(10), ...
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ApproximateTime Policy of message filter doesn't filter right

Hi all, I would like to synchronize some of my sensordata (kinect and a webcam) in the mater of time. My webcam seems to put everything in a internal memory before transmitting it. Because of that I ...
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no matching function for call to message_filters::sync_policies::ApproximateTime

Hi All I am using ROS to subscribe some camera topics in two different ways. Fist subscribe Topic from published messages and second subscribe them directly from bag file without playing bag the file ,...
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