About the sensitivity of the sensor under different lighting conditions
I have a question regarding the reduced sensitivity of sensors under low light intensity. I noticed from the datasheet that a higher contrast change is required to generate an event under low light intensity. However, it seems that the same absolute value
Power consumption EVK3
Hello everyone! According to the product brief document of EVK3 power consumption is 4.5W, there is no power consumption value in the manual of EVK3. For EVK4 - power consumption 500mW (Typ), 1.5W (Max) (according to its manual). So we measured maximum
How could I measure the S-curve of the IMX636？
Due to the requirements of my research, I need to measure the response probability curve of the IMX636 sensor to different contrasts accurately. How should I proceed with the precise measurement? And this link https://support.prophesee.ai/portal/en/kb/articles/gen4-0-qe
Deciding between EVK4 and Kria starter kit.
Hello Prophesee Support team, We are trying to purchase the IMX636 sensor, but are deciding between EvK4 and AMD kria kit. I am concerned whether there would be more complications with the kia kit. - Are there any limitations for using the AMD kria kit
EVK4 HD Evaluation KIt
Hello Prophesee Support, I have following questions regarding EVK4-HD. 1. Does you provide Lens with EVK4-HD kit purchase? 2. Can you provide 3D CAD model of the lens ? Regards, Nikunj
Possible acquisition problems with stripes and misalignment
Hello everyone, I've been experiencing some strange behavior with the visualization of events. The sensor model is EVK4. I have two devices, and both exhibit the same behavior. Specifically, I notice several shifted bands across the image, almost as if
EVT 2.1 format and examples from GenX320
Hi there, I'm working on an application using the Kria KV260 starter kit and GenX320 sensor. We have the simulation IP working correctly and producing events which correspond which is great but I have two questions: Based on my understanding of https://docs.prophesee.ai/stable/data/encoding_formats/evt21.html,
Use the trigger interface to collect, and open the collected RAW files with metasion software. There is a freeze on the screen. How can I eliminate it? Thank you!
External trigger source 1MZ, logic analyzer test results RAW file trigger information 3、When opening RAW files through METAVISON software, the screen keeps getting stuck, and the effect is as shown in the attachment. 4.problem 4.1. Want to know how to
Data Collection Issues
I want to use a Python script to simultaneously control the real-time display and acquisition of event data and frame camera data from the same scene. When I use dual threading, the event stream thread displays and saves normally, but the frame camera
Pre-trained Model
I want to implement event stream based object detection and tracking, I noticed that the official documentation mentions pre-trained models, what algorithms it uses and what datasets it is trained on, where to download pre-trained models
Contrast threshold IMX 636
Hello, I've been watching this video (Metavision Training Videos | Introduction to Event-Based Vision Sensor) to understand the definition of contrast threshold. They mentioned that IMX 636 sensor uses a log definition of contrast but I haven't found
adding a hardware IR cutoff filter in EVK4
Hello Prophesee and community, we would like to record in an environment which is contaminated by "IR flickering light". So we plan to add an IR cutoff filter into EVK4 (HD). Similar to the description for EVK1 here: https://support.prophesee.ai/portal/en/kb/articles/inserting-filter
Camera sensor check
Hi Prophesee team, I want to find a sensor data sheet for our camera RDK2 IMX636. Could you please help me give me some information about it? Best regards, Yugang
Understanding the relationship between bias settings and intensity
Greetings, I have an IMX636 sensor. I understand from this question (https://support.prophesee.ai/portal/en/community/topic/questions-about-biases) that the specific relation between the change in intensity of the incident light needed to trigger an event
IMX 636 conference proceedings
Hello, Is this proceedings conference document ''5.10 A 1280×720 Back-Illuminated Stacked Temporal Contrast Event-Based Vision Sensor with 4.86µm Pixels, 1.066GEPS Readout, Programmable Event-Rate Controller and Compressive Data-Formatting Pipeline |
Why does frequency have to vary to measure LLCo and HLCO
Hello, I'm trying to measure the dynamic range of the GENX320 sensor. In the datasheet v1, the test conditions of the measurement are as follows : I was wondering why frequency had to vary between 2.5 Hz and 80 Hz? Cheers, Michael
S-Curve : why does pixel response probability go above 100% for GENX320 and not for IMX636 ?
Hello, I measured S-Curves for the IMX636 and the GENX320 and found that above a certain contrast value, pixel reponse probability values go above 100% for GENX320 and saturate at 100% for IMX636 . I saw you have a note on hot pixels for the GENX320.
Can I record only OFF events from hardware?
Hi, There are some variables of the hardware that we can control with Metavision studio, for example the bias and the ROI. Can I control the type of events that I want to record? Because in my specific case I only need to process the OFF events, but the
Readout saturation definition
Hi, is it correct to say that read saturation is a combined effect between event rate and number of active rows in the image? I have done an experiment with different lighting conditions and speeds and I find that improving the lighting conditions, the
How to make sensor to ULP mode with GEN320 EVK?
I read the datasheet, and find ULP_ENB and ULP_RST to set sensor to ULP mode, but I don't know where the pins on the evk. Can you tell me if there any way to ULP mode?
fisheye lens for EVK4 camera
Hi, We have procured a EVK4 camera. We were looking for fish eye lens that is compatible with EVK camera. Can you please recommend/suggest few of them.
Color temperature of light source for electro-optical caratersitics of GENX320
Hello, I'm trying to measure the electro-optical caracteristics of my GENX320 sensor in the same conditions as the datasheet indicates. For the light source, the datasheet indicates : When you look at the wavelength associated to this color temperature
ROI of the raw event data
Dear Sir or Madam, Greetings! I am trying to use event camera to build data set. And I want to reduce the memory size of the event data by restricting the ROI. I use the following command to set the ROI. The problem is that it seems the area out of the
Inquiry about Temporal Resolution and Latency Measurement for EVK4 HD Camera
I was reviewing the technical specifications of the EVK4 HD camera(imx 636 sensor) and noticed that it states the camera has a temporal resolution equivalent to >10k fps. I have a couple of questions regarding this specification: Measurement of Temporal
Why do some pixels keep outputting negative events?
Hi, when I lower the bias_diff_off value (to less than 0), some pixels are always outputting negative events in all rendered frames. In other words, these pixels are always displayed as light blue and no longer change. But positive events are displayed
How does Bias work?
Hello. My sensor is IMX646. And I want to know how the comparator's positive and negative threshold values change after adjusting the bias_diff_off and bias_diff_on values?
Questions about biases
Hello, I have learned that bias_diff_off, bias_diff_on, bias_fo, bias_hpf, bias_refr have no physical units, they are just numbers that represent the deviations. I can get the absolute deviation values of each parameter from Figure 1. But I still have
IMX636 pixel reset
Hello， I would like to know how to set the reset function to a fixed time，there is an example in the IMX636 productspeification which inputting an approximately 3 ms reset pulse from the TDRSTN pin. And, here's the code I added in the metavision_vie
EVK4 sparking curve under different ambient light
Do you have similar probability curves for EVK4 cameras?(To be honest, I can't find out which of your web pages I saw this picture on……)
Maximum temporal resolution of the PPS3MVCD sensor
The datasheet the PPS3MVCD sensor states that the pixel latency is nominally 100μs. According to support, this latency is due to the processing that occurs on the chip and the speed of transfer supported by the USB interface. The pixel delay is nominally
Asking for Probabilistic trigger curve
The trigger of the event camera depends on the change of light intensity, so is it related to the ambient light intensity? What is the probability of different contrast triggering events under different ambient light?
Higher Bias_off more OFF events?
Hi, I would like to know why if we increase the value of the OFF contrast threshold (Bias_off) we end up having more OFF events instead of less. What I understand is that if we increase the threshold is going to be harder to trigger an event but in this
Sensor electro-optical performances
Hello, Were the hot pixels masked or taken into account in the measuring of the electro-optical performances of the GENX320 (for example for the S-curve) ? Cheers, Michael
How to use the hot pixel detection code
Hi, I'd like to use the active pixel detection algorithm from the sdk (https://docs.prophesee.ai/stable/samples/modules/driver/active_pixel_detection.html). When the code is runnig, do i need to have a specific light stimulus for the sensor ? Cheers,
Metavision studio stops recording when I use reset signal on EVK3's TDRSTn pad
Hello, I'm following the procedure from the GENX320 datasheet for square light stimulation of the sensor for electro-optical caracterization : I generate a reset pulse on the EVK3's TDRSTn pad. When I start an acquisition, Metavision studio screen freezes
[SDK][ERROR] 0:1(10): error: GLSL ES 3.10 is not supported.
I am trying to run the metavision_sparse_optical_flow.py example script in linux on a .raw file I have collected. When I try to run the example, I get the following error messages. Online I found a recommendation to use "export MESA_GL_VERSION_OVERRIDE=3.3"
Error reading an HDF5 in python (MacOS)
When trying to read an HDF5 (converted from a RAW recording) using the h5py library I have the following error: OSError: Can't read data (required filter 'HDF ECF filter; see http://www.hdfgroup.org/services/contributions.html' is not registered) Here
What are the voltages in the LPF and HPF exactly indicating?
Hello and good day, For Gen3.1 sensors I know that the high-pass and low-pass filters' values are indicated in mV. This voltage is exactly from which part of the sensor and changing them makes what changes in the circuit? Is there a schematic diagram
Why use a lifo ?
Hello, I was curious to know why there was a lifo on the GENX320 sensor. Is its purpose purely for calibration and sensor caracterization (like QE), or does it have other useful applications ? I can't seem to find extensive information on this subject
Convert RAW files to DAT files in batches
Hello， I want to know how to convert RAW files to DAT files in batches. For example, there are 20 RAW files in a folder, it is too cumbersome to use the "metavision_file_to_dat.exe" to process them one by one. Thanks.
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