Strange Behavior recording raw files in quick succession
Hello Again, I apologize if I am spamming this forum, I've gone through the documentation, but I'm still running into some strangeness I cannot explain. I am trying to record several raw files in quick succession. I'm doing this with the HAL python library
Event camera acquisition on Jetson Orin
Hello, I would be interested to make event camera recordings with a jetson orin : 945-13730-0005-000 | Kit de développement NVIDIA Jetson AGX Orin Developer Kit NVIDIA | RS (rs-online.com) Event Camera Evaluation Kit 4 HD IMX636 Prophesee-Sony How can
Inference Pipeline of Detection and Tracking using C++
Hi! I downloaded this folder LibTorch 1.13.1 for CUDA 11.7 I'm trying to compile this example: Inference Pipeline of Detection and Tracking using C++ — Metavision SDK Docs 4.0.1 documentation (prophesee.ai) When I done this line cmake .. -DCMAKE_PREFIX_PATH=`LIBTORCH_DIR_PATH`
Image generating by accumulating events in 40us generates a aliased image in Gen4
Hi, I was trying to capture a really fast event that lasts a few microseconds. After recording, I tried plotting the image by accumulating events in 40 us time window. I see that the images are getting formed row-wise. I have attached snapshots of the
3~4ms temporal interval between event callbacks
I'm testing the speed of callbacks using the following code: (the whole code is based on your hal sample) if (i_cddecoder) {
// Register a lambda function to be called on every CD events
auto start_t=std::chrono::system_clock::now();
What is the correct way to handle the device object lifetime
I have written a class that wraps the RawReader class. I instantiate the reader as described in the documentation by first creating a device, setting all of the hal properties for the device, creating the reader from the device, and returning the reader.
Minimum accumulation time to visualize
Hello, Since you know that the accumulation time is the corresponding variable that is used in events to approximate the correspondence to a certain frame rate. I would like to know what is the minimum accumulation time that I can use to visualize the
Accumulation time below 100us tracking_spatter.py
Hi, I'm doing some experiments to evaluate the performance of the EVK 2 and for that I'm tracking some dots that are rotating, I used the tracking_spatter.py algorithm from Prophesee where I need to sed the accumulation time, which is going to be also
Pipeline stage that outputs the coordinates of undistorted events
Hello. I am referring to the sample code (https://docs.prophesee.ai/stable/samples/modules/cv/undistortion.html#chapter-samples-cv-undistortion) and using pipeline processing to event I am trying to correct the undistortion of the image output from the
How to save files (of my EVK4) by Python API？
hello，i can use `metavision_core.event_io.EventsIterator` to capture evs signals, but how can i save them to RAW file or H5 file with python API ?
Stereo Calibration
I am trying to add a stage to a stereo calibration pipeline this stage must receive the flow of two streams of the events coming from two Prophesee cameras and the stage must filter them and lets go only the events coming from both cameras having the
Stage as class member
Hello, Prophesee Team! Small question, I have searched all examples, and everywhere you have: Metavision::Pipeline p(true); auto &cam_stage = p.add_stage(std::make_unique<Metavision::CameraStage>(std::move(camera), ebd_ms)); but how would you properly
Feature tracking algorithm
Hi, Is there a feature tracker specifically made or compatible with a prophesee event camera? I want to compare such an algorithm to a conventional KLT tracker. Does metavision or a third-party company provide such an algorithm? Kind regards, Rik van
Event Simulator and Pixel Pitch
Does the EventSimulator class (see documentation here) take into account the pixel pitch of the camera that shot the video? I have video from a CMOS sensor that has a pixel pitch of approximately 3 microns. The Prophesee EVK 3 has a pixel pitch of 15
Request for Assistance with Adjusting Event Rate Control in Python Binding
Dear Prophesee Team, I am writing to seek your assistance with adjusting the Event Rate Control in the Python binding for the sensor I am currently using. Specifically, I am using a sensor with a resolution of 720P, which produces an excessive number
Disable Stage on Running Pipeline
Hello, Prophesee Team! I am trying to make FrameGenerationStage to be able to be: disabled (and free all resources and processing time), enabled back reset (new accumulation_time_ms and fps), Questions: Does all resources and processing time get free
How to change parameters or state of a stage from the scope of other stage?
Let say at some point while in the scope of the Stage2 I want to change some fields of the Stage1. I can access the stage with next_stages() or previous_stages(), and hopefully change any public fields, or callbacks without any problem, correct? What
Skipping events, based on the performance problems
Hello, Prophesee Team! Let say we have a simple pipeline: auto& cam_stage = p.add_stage(std::make_unique<Metavision::CameraStage>(std::move(cam), event_buffer_duration_ms)); auto& algo_stage = p.add_stage(std::make_unique<AlgoStage>(), cam_stage); auto&
Resolving very slow motion without flickering
I am trying to image fluorescent beads in a water suspension under a microscope. The beads move very slowly. When viewed through a CMOS camera you can see the beads slowly moving. In the event camera though it mostly just flickers. What causes this behavior
Slave Camera Recording file has obvious lag
I synchronized two event cameras and tested them. When recording, pictures of the master and the slave camera are perfectly fine and no lag is displayed. But when I open raw files, master.raw is fine, slave.raw shows obvious lag (similar to slow motion),
Metavision Pipeline and IPC (Interprocess Communication)
Hello, I can't get my head around how to make C++ Pipeline work with IPC (NamedPipe for example). I am interested in both directions: sending some data to another application. The most fitting to the Pipeline probably would be "SenderStage", similar to
Metavision build - Debug mode
Hello, I am trying to build the getting started sample in debug mode. See attached for my CMakeLists.txt and source code. I also attached the logs for my CMake config and build steps. When configuring my build in Release mode, I am able to detect the
Raw to HDF5 conversion
Hi, I am trying to convert a RAW file to HDF5 and I am receiving the following errors and warnings, what may be the cause ? Is there documentation on it ? Thank you in advance. [HAL][WARNING] Evt3 protocol violation detected : InvalidVectBase [HAL][ERROR]
Down sample the resolution of event camera
Hi, I'm using evk4 for research and I wonder that whether there is a way to down sample the camera resolution from 1280*720 to 640*480 to reduce the extremely high bandwidth data. Since I use it for slam, I don't want to set ROI to crop the FOV. Hope
Is it possible to receive 'External Trigger event' with Metavision studio?
I want to synchronize a frame camera with an event-based camera using Metavision studio. I would appreciate it if you explain how
Having missing events in the images.
Hi PROPHESEE Support, So i got two problems, the first one is when i use the prophesee_ros_viewer.cpp from the prophesee_ros_wrapper(https://github.com/prophesee-ai/prophesee_ros_wrapper), sometimes i get blank lines in the middle of the image, see the
ExtTrigger events not working when multiple cameras opened in same address space
This problem arises with a pair of SilkyEVCam's (Gen3 sensor) using MetaVision 3.0.2 (compiled from OpenEB). For testing one of the cameras generates an external triggers and has the input set to "loopback". Running two executables side-by-side works
AccTime for sparse optical flow
Hi, Am i correct that the sparse optical flow sample only works with an accumulation time of 33ms? How can I make it work with 66 or 100 ms? Kind regards, Rik
The assert error when running classification inference
Hello, I am interested in the Metavision SDK and try to run the demo of classification inference from https://docs.prophesee.ai/stable/metavision_sdk/modules/ml/samples/classification_inference.html?highlight=classification. I have installed SDK(python3.7)
There is a very obvious display delay when developing our data collection software
While developing our data collection software with five EVK4 cameras, we ran into a display problem. We have contacted the local Prophesee support, and they told us to test the provided sample code (metavision\sdk\cv\samples\metavision_noise_filtering).
Metavision studio crashes without error messages
Hello, Metavision Studio crashes immediately after start, even before the GUI appears. There is no error message produced and seemingly no logging output generated. I am using metavision SDK version 3.1 and a EVK2-4.1 with the latest firmware. Has anybody
ModuleNotFoundError: No module named 'metavision_core'
Hello, I have installed metavision SDK on ubuntu 18.04 successfully, and the Metavision Studio worked well. Besides, I have set the anaconda environment according to the usage https://docs.prophesee.ai/stable/installation/linux.html. However, when I
Filtering the event video
Hi After filtering the raw event video using various filtering algorithms as shown in your code example, is it possible to save the filtered event file as a raw file?
imu camera calibration
good morning all! I'm trying to create an all-in-one disposable with silky ev cam and lsm9ds1 imu. Can someone please tell me how to create the rototranslation matrix for this complex system for the calibration? Thank you !!
Index file created by metavision_raw_info.exe
When executing metavision_raw_info.exe from Metavision Intelligence 3.0.2, an index file named [input_raw_filename].tmp_index is automatically created. I remember this was not the case for older versions, which did not create any additional file each
Daisy Chain Build
Hi, In the synchronization application notes it says: "Daisy Chain is not yet supported natively in current software release. Contact us for more information on how to build it." I am using the OpenEB version of the driver, built for Fedora OS (which
Sparse Optical Flow
is there a publication where I can read how the used algorithm for sparse optical flow computation works?
How to produce() for FrameDisplayStage
Hi, I'd like to visualise images outputted by a custom stage. To do that, I'm inheriting from BaseStage and now need to call produce(xxx) appropriately. I saw that the class FrameDisplayStage tries to cast the input to FrameData in the function set_consuming_callback
When to use SDK vs HAL
After reading through the tutorials, it seems to me that many things can be achieved through the HAL API that can also be done through the SDK. For example, opening a camera and adding a callback for events can be done using the HAL (eg HAL Viewer Sample)
EVK4 Gen4.1 bias settings
Dear Prophesee team, the new bias settings shipped with Metavision 2.3.2 comes with all bias settings in the imx636_CD_standard.bias are set to zero. Additionally, from the EVK4 documentation, there is a printout from the Metavision Intelligence Suite
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