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]
How to evaluate the quality of synchronization between event camera and external sensor?
Hello, I'm working on synchronization between IMU and event camera(EVK4). I use hardware trigger to synchronize as documentation says. However, it is hard to evaluate the synchronization quality. A naive way is the compare the data between IMU acceleration
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
120 degree FOV lens for EVK4 HD
Hello everyone! Does anyone have a recommendation for a good quality, but not overly expensive lens for the EVK4 HD? 120 degree FOV. BR
cannot retrieve biases on SilkyEVCamHD
On a SilkyEVCamHD the reading of bias parameters through the SDK fails. The identical code works for the SilkyEVCamHD: const Metavision::Biases biases = cam_.biases(); Metavision::I_LL_Biases * hw_biases = biases.get_facility(); const auto pmap = hw_biases->get_all_biases();
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
Research papers
Hi, Does prophesee provide research papers with their algorithms? If yes, where can i find them? Kind regards, Rik van den Boogaard
OnDemandFrameGeneration Segmentation Fault and malloc error
I have run into a problem with the OnDemandFrameGeneration algorithm when encountering high event rates. Currently we are making our own multi-event camera calibration program (to calibrate intrinsics and extrinsics in one pass) and I found the OnDemandFrameGeneration
EVK4-HD 事件相机的同步怎么接
您好，如果我想要实现事件相机与RGB相机帧同步，我需要怎么接呢？我有一个主控制器可以给RBG相机发帧同步Tigger，事件相机这一段我是只需要把那个Tigger接5脚就行了吗？他的时钟可以悬空吗？
How to record a raw file with external trigger events?
Hello, What is the correct procedure to record raw files with external trigger events? When I record raw files either with metavision_studio, metavision_viewer or metavision_player, the recorded .raw file contains no external trigger events, as reported
Low Light Bias setting
I am intending to collect recordings in low light conditions. I have played around with the bias settings and found that the following settings give me the best visuals: 299 % bias_diff 228 % bias_diff_off 370 % bias_diff_on 1650 % bias_fo 1525 % bias_hpf
Where to get Quantum Efficiency for the EKV4-HD chip？
EKV4-HD是否使用GEN4.0芯片？是以下链接吗？还是以下文件？https://support.prophesee.ai/portal/en/kb/articles/gen4-0-qe
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?
3D visualization of the camera poses
Good morning, I'm working with Show Calibrated Pose after having calibrate my camera and I have a couple of questions: 1. I would as first notice that if I run show_calibrated_poses.py -e /path/intrinsics.json -m it returns an error Traceback (most recent
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 !!
Is it possible to invert the polarity of EVK4 sync_out?
We are designing a synchonization circuit for multiple EVK4 cameras. In our test, the fall edge of the sync_out signal (50ns) is much shorter than the rise edge (~200ns). Is it possible to invert the polarity of sync_out signal by setting the api/registers
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
Is there sample code for vibration monitoring about amplitude?
Hello. I want to display vibration monitoring about amplitude at SilkyEvCam(VGA). I found vibration sample code "Vibration estimation". https://docs.prophesee.ai/stable/metavision_sdk/modules/analytics/samples/vibration.html#chapter-sdk-analytics-samples-vibration-estimation
Consume trigger events using the BaseStage/Cam API
Hi, Just wondering if it is possible to access trigger events using the BaseStage::set_consuming_callback() API. In the docs there is only mention of the HAL API for accessing trigger events. Thanks!
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 Gen4.2 bias settings
Hello, I wonder how to interpret the values "bias_diff_on" and "bias_diff_of" and why it is not possible for our setup with EVK Gen4.2 to set both values to 190 and 190. Metavision3.0 allows us to set only 190 and 140. What is background of that behavior?
EVK1 GEN3.1 VGA - Pins "push pull" or "open-collector"
Hello, We want to synchronize a 2D camera with the trigger of an EVK1 GEN3.1 VGA camera. To do this we use the PIN 0 and 1 of the camera as detailed in the following link: https://support.prophesee.ai/portal/en/kb/articles/trigger-in-out We would like
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
Access to DominantFrequencyEventsAlgorithm class in Python
Hello, We are working with the program metavision_vibration_estimation.py and we would like to access the DominantFrequencyEventsAlgorithm class of the Analytics module in Python. We would like to redefine the use of the "min_pixel_count" parameter
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