Quantifying Signal Strength
I'm trying to quantify the strength of a signal at different accumulation periods, from 100us up. Typically I would use SNR for this, but in the case of an event sensor, that metric is mostly irrelevant. Can someone recommend a strong candidate for quantifying
Why do the OFF events come first in a moving object?
Hello, In this example the spinner end is spinning from left to right (clockwise). Why are the first events happening OFF events? Because the contour of ON events also do not look round, so I was wondering how the camera records the movement.
Ask for help
Hello, I would like to ask what is the difference between setting bias_diff_off to -20 and 20?
How is equivalent frame rate calculated?
Hello and good day, As I know frame rate is not a defined parameter in event-based cameras but is there a formula to estimate how fast of a change in the scene can be detected? In Prohphesee's website more than 10000 fps is mentioned as equivalent temporal
"Passthrough Not Supported, GL Disabled, ANGLE Error in Prophesee on Windows"
Bonjour Madame/Monsieur, I'm encountering an issue when running Prophesee on my Windows. The error message I receive is: ``` C:\Program Files\Prophesee>[11660:0516/100937.361:ERROR:gpu_init.cc(486)] Passthrough is not supported, GL is disabled, ANGLE
Flickering bars on event stream
I have a Prophesee EVK4 camera and I'm noticing a strange occurrence when attempting to record a stream with the camera face down. There is constant bar flickering across the stream. Most other orientations are completely fine; it only falls apart with
Request camera information
Hello, the picture is the information of my camera. I would like to know what the unit of the contrast threshold of this camera is? And what is the range of each parameter? Thank you.
EVT3 NonMonotonicTimeHigh error happened
Hi All I'm trying to use four EVT3 in one PC. I use metavison studio version 4.5 to open four EVT3 camera. Sometimes it will occur NonMonotonicTimeHigh error, it happened randomly not always in the same camera. I found this document from prophesee website,
GenericProducerAlgorithm::is_done() does not change status automatically
Hello, I use Metavision::camera for reading from a file or a camera, and GenericProducerAlgorithm to get events (in the same way as in the metavision_player example) Now I want to close the application when all events was read from a file and processed
RCT value of GENX320
Hello, I have a question regarding the RCT (Ramp Contrast Threshold) value of the GENX320 from the datasheet. I don't understand how RCT=50% if NCT=30% : Let's suppose that NCT=30%. Using the values of the experimental setup for the RCT measurement, if
Using Prophesee camera for paint thickness estimation
Hello, I want to use the Prophesee camera, EVK4, for estimating the paint thickness while spraying. Is this possible to measure the size and velocity of the tiny paint particles using your camera? Is there any code or instruction that I can use? Thank
ColorPalette in metavision_simple_viewer.py
Hi, All! When I change ColorPalette in metavision_simple_viewer.py I get these error: Code lines 55, 56: As the same time ColorPalette with Light, Dark and CoolWarm is working. How can I manage with this error? Best Regards, Rafael.
Why does the sensor detect better changes in higher initial light level?
Hello, I have a question regarding CDP (Contrast Detection Probability) graphs and contrast sensitivity, Why does the sensor have a higher chance of detecting the changes (contrast) when the initial light level is brighter? What is the reasoning or mechanism
Reduce resolution of a recording
Hello, I am running some recorded .raw data with 1280*720 resolution and I would like to make some comparisons on how this would work on a 640*480 resolution. I have been searching on how to do this and I have seen the posibility of applying a ROI filter
Delayed response of events in Low Light Conditions.
Hii, my experiment consist in a black rotating dot with a background light to generate contrast. When I keep all conditions the same only changing the light intensity of the background light I notice that there is like a time delay or a latency (I dont
High latency in generating negative events
Hello, In an extremely dark environment, a laser creates a point light source on the IMX636 and moves at a constant speed. According to the imaging principle of an event-based camera, the time for the point light source to generate positive and negative
Measuring Pixel array current GENX320
Hello, Is there a pin on the GENX320 EVK3 kit where it possible to measure the total current generated by the photodiodes of the pixel matrix ? I'm trying to measure dark current from the pixel's photodiode. For that, the closest i got to the value of
Help! how to deal with the problem?
OS: Windows 11 Professional (23H2) Error: Metavision studio internal error, code 3221225785 signal null
Video writing for spatter tracking
Hello, I am using the metavision_spatter_tracking.py code with these parameters: python metavision_spatter_tracking.py -i recording.raw --cell-width 7 --cell-height 7 --activation-ths 10 --accumulation-time-us 50 -f 3 -o video I want to save the video
How to record in stereo?
Hello. I'm connecting 2 event cameras in stereo. I already did the synchronization by using the metavision_sync.py algorithm but I couldn't find out how to start to record with both cameras at the same time. I used the metavision_simple_recorder.py but
When the saturation takes place, do the remaining columns become more sensitive?
Hii, I have been doing an experiment to understand a bit more the behavior of the camera when the saturation takes place and my results show that the higher the saturation, the higher the average event rate per row. My experiment consists of several points
Writing in a GENX320 register
Hi ! I'm trying to measure the quantum efficiency for GENX320. I'm trying to follow the same procedure as in the related article https://support.prophesee.ai/portal/en/kb/articles/qe-estimation As the article mentions, quantum efficiency can be determined
OpenEB: metavision_player (.cpp example) doesn't write video in .avi
Hi! I compiled OpenEB on Jetson platform (Ubuntu 20.04) according the manual: https://docs.prophesee.ai/stable/installation/linux_openeb.html#chapter-installation-linux-openeb I need to save recorded video from event camera EVK3 in .avi format: ~/openeb/sdk/modules/core/cpp/samples/metavision_player/
How to get a symmetry between bias_diff_off and bias_diff_on about IMX636
Hi, there is a note that it is possible to get a symmetry between "bias_diff_off" and "bias_diff_on" by setting those two bias parameters to the same value in the biases of metavision SDK docs. I want to know the same value is point to the current value
How to improve the writing speed of CSV files?
# Define a thread function to write to the CSV def write_to_csv(event_queue, output_file): with open(output_file, 'w', newline='') as csv_file: csv_writer = csv.writer(csv_file) while True: try: # Get events
How do I output recorded events directly to a.CSV file instead of a.raw file
I'm using python. I saw the simple_recorder routine and the raw_to_csv routine in the python example. But I had a problem when I tried to combine the functionality of these two routines (to display camera contents through a window and output a csv file
Dynamic ROI
Hi guys I am trying to solve the following problem and am stuck: I have detected some regions of interest. In addition to the position, I have recorded the corrosponding timestamp. Now I want to dynamically extract the regions from the existing RAW file
access to the introspect player
Hi there, I found out about the Introspect Player shown in the bias tunning video. https://support.prophesee.ai/portal/en/kb/articles/bias-tuning-region-of-interest-roi-31-8-2023 It would be very useful for our research if we could access it. I was wondering
Problem generating Histo or Diff raw files
Hello, I am running "event frame gpu loading sample" by following the exact instructions given: First, compile the sample as described in this tutorial. Then, you can use the metavision_event_frame_generation sample to generate event frame RAW files in
Event Frame GPU Loading Sample using C++
Hello, I am trying to run the Event Frame GPU Loading Sample using C++ and I am getting an unexpected error. I installed CUDA 11.7, and i am running in a Windows OS. I am following the steps as stated here: Event Frame GPU Loading Sample using C++ — Metavision
Duplicate events in the event stream
Hi, I'm using EVK4 HD for event data collection. I find that there are several duplicate cd events (i.e. the same events in pixel location, timestamp and polarity) in the event stream. Are these duplicate events redundant, which I can remove without any
Some routines do not run and cannot find corresponding module
When I tried to run the metavision_sdk_get_started file, I found that some of the files were not found in the set file (see the image for details). My python version is 3.8. I'm using the windows version. Can you tell me what I should do to successfully
No module named 'metavision_sdk_base_paths_internal'
Hi, Prophesee team I want to install Metavision SDK on Ubuntu 22.04 and i installed it following the installation document. But when i trie to run python tutorials, i meet a problem :No module named 'metavision_sdk_base_paths_internal' . My python version
Issue with Converting Recordings to HDF in Metavision Studio
Hello I have encountered an issue while using Metavision Studio to convert a series of video recordings into HDF files. Specifically, when attempting the conversion process, some of the videos fail and prompt an error message related to the chronological
All paths, where OPENEB binary is installed on linux (arm64, Jetpack 5, ubuntu 20.04)
Hello Prophesee Team, I have compiled my CPP application on the development system and now I am trying to understand which binaries are exactly created on my development system by the OPENEB 4.3.0 installation process. This will allow me to copy them
Restarting the "Photodiode Voltage" for EVK4
I'm a student at Carnegie Mellon and we're working on a project that needs to measure the events when the illumination of a pixel increases from zero in a static scene (such as instantaneously taking the lens cap off). Currently, we have an EVK4 model.
Raw file to video
Hello, I noticed that there are some code samples available for converting RAW files to video in C++. However, I'm having difficulty finding an equivalent solution for Python. Could you please advise if there is any Python code available to do this ?
vcpkg installation error
Hello, This might not be related to the application directly, but I am getting stuck at one of the steps in the installation process! I am having trouble installing the vcpkg as it is having trouble downloading 7-zip and manually downloading it and adding
When the camera is connected to the computer, the camera cannot be recognized (Windows)
Installation package version: 4.5 After the camera is connected to the computer, the device WestBridge can be found in the universal serial, but the camera cannot recognize it. What plugins do I need to install or do so that the camera can recognize it
PolarityFilterAlgorithm is not in Pipeline
Hi! How to use Metavision::PolarityFilterAlgorithm() algorithm in metavision_viewer.cpp file without pipeline? Metavision::PolarityFilterAlgorithm() used in 2 examples: metavision_filtering.cpp and metavision_composed_viewer.cpp with pipeline. The part
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