Questions tagged [image-sensor]
A semiconductor device which when placed behind a lens and has an image formed on it's surface spatially and temporally samples the charge generated from the incident light. These samples form an internal representation of the incident light. Types of image sensors that are common are CCDs, CIS (Contact Image sensors), APS (Active Pixel devices) and CIS (CMOS Image Sensors)
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Horizontal Blanking Interval (Idling Time) optimization
I have questions regarding the time slot in-between two frames of video stream, i.e. Horizontal Blanking Interval (let's say HBI in the following), seen as Idling Time sometimes.
Considering a CMOS ...
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Different Vertical and Horizontal full well capacities for CCD image sensors
I want to use a line sensor for a medical imaging application. I understand that the full well capacity of the pixel is the maximum number of photo-electrons it can store before it gets saturated.
I ...
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S11108 Circuit Design Logic
This is my first post and also my first dip into electrical engineering, and I wanted to ask if you have any suggestions on the circuit I have designed. As a background, I'm a Computer Science student,...
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Are there any microcontroller's that support MIPI-CSI2?
As the title states; are there any microcontrollers that support MIPI-CSI2 on the market?
I know product recommendations are not allowed as part of the stack exchange so I will clarify a little ...
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Can Raspberry Pi be used for LVDS image signal reconstruction
I have a NOIP3SN5000A image sensor manufactured by Onsemi with a LVDS output. I would like to reconstruct the output signals into images by a Raspberry Pi 4B, can it work?
I have seen a lot of ...
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Testing the linearity of a CMOS image sensor
The EMVA 1288 standard guides how to measure the linearity of a digital image sensor, i.e., if the digital number from a pixel changes linearly to the incident light intensity. The procedure includes ...
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Connecting a Kodak KAF-0402 (CCD-Sensor) to an ESP
I have a Kodak KAF-0402 CCD sensor. I would like to connect it to an ESP8266 or ESP32.
After an intensive internet search I found nothing about this.
Can you confirm if this will work at all, and if ...
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CMOS image sensor does not produce a picture, only vertical green/pink lines
We use the AR0521 CMOS image sensor and the iMX8 MPU for video recording.
75% of our PCBs don't have an image at the output, only green and pink vertical lines (see picture), but other PCBs work ...
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Interfacing AR0237 to CYUSB3014
I'm currently creating a RGB+IR webcam application using the CYUSB3014 from Infineon with the AR0237 from OnSemi. After a bit of fiddling around with the help of the AN75779 from Infineon and the ...
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Reading sensor data - help with timing chart
I am reading data from a C12880MA mini-spectrometer from Hamamatsu, I am having a bear of a time understanding their data sheet. I am able to read the data from the spectrometer, however I want to ...
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Directly connecting MIPI Camera and Display
I have a little bit of a hard time wrapping my mind around MIPI.
My mission:
I want to connect a MIPI camera directly to a MIPI display.
Camera pin-layout:
Display pin-layout:
The Interface of the ...
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Can I use my old Sony Camera's Night Shot to detect shorts? [closed]
I have an old Sony TRV-14 with a built-in night shot mode for shooting videos in the dark. It is my understanding it works by using sensing infrared radiation which is also how thermal imaging cameras ...
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Is a pinned photodiode necessary in a 4T APS cell?
I would like to know if a pinned photodiode (PD) is required or desirable for a 4T APS cell that performs global shutter?
If yes, Why is it so necessary instead of using a conventional PD?
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Converting Radiant Energy to ADC Voltage
I am working on a camera sensor and was trying to get a rough estimate on if a given camera module has enough dynamic range. Fortunately I know the target and illumination source. The dynamic range I ...
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Why are CCD images better than CMOS?
I read that CMOS image sensor technology was discovered first but then they had more noise and thus once CCD was invented, CCD got popular because of better image quality.
After decades, now we use ...
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How to interface to more CSI-2 devices than available CSI-2 modules on MPU?
the problem is:
I have a MPU which has only 2x CSI-2 modules (each with 4 data lanes), however I want connect to 4 other devices over CSI-2 interface (each device has one CSI-2 module).
So the ...
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Why 3T APS pixel implements a NMOS reset transistor instead of a PMOS?
I'm very curious about why the 3T APS píxel sensor implements an NMOS reset transistor.
As it is well-known, we will have a voltage of Vdd-Vth during the reset phase. This situation will imply higher ...
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JPEG compression benchmark on Cortex M4
I am currently using an STM32F4xx and extracting an already compressed JPEG from a camera module OV5645 as that particular sensor has an internal JPEG codec. I want to starting using a new sensor, ...
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Noisy parallel digital image capture
I have a couple of FPGA setups to capture images from an Aptina/ONSemi MT9P031 sensor.
I've done this in the past with no issues but now I have a strange problem.
I have a bit of scene dependent noise ...
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Why am I getting an odd pattern from my image sensor?
I am using an Omnivision OV7251 image sensor with 640x480 greyscale pixels. Currently, it's not properly attached to its lens, so I'm seeing mostly grey. This is the image I'm getting back from it:
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Recording multiple pixels simultaneously in CMOS or CCD image sensors
Is it possible to recording multiple pixels simultaneously in CMOS or CCD image sensors?
Because of the low intensity of radiation I need to increase the surface area of the each pixel (photodetector)....
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How do FLIR cameras work with multiple spectral image acquisition?
I am looking to buy a FLIR camera, but it is hard to get in contact with the company. I wonder if somebody already used, or has knowledge about my question, which FLIR cameras can capture images in ...
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Geometric information within 1D streams of electrons/photons
How is light—or actually any frequency in the EM spectrum—self-encoding and self-modulating 3D info in its 1D self, so that it “knows,” once it strikes a surface, to discharge all the data perfectly ...
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Are there any manufacturers of color image sensors who publish their datasheets?
I need a 1/2.7" image sensor with MIPI interface for a project. After some research I thought OV2710-1E might be a good choice, so I tried to find a datasheet, and found nothing. So I requested ...
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Is a STM32F103 able to handle 74.25MHz from an image sensor?
So I have this project in my mind where I want to read pixel data from an image sensor via a microcontroller (e.g. STM32F103) and then display the image on a screen.
The image sensor I have in mind ...
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Interfacing many camera modules using a single DVP bus
I need to create a circuit that will have many cameras. Possibly the OVM7692. I will connect this array to my host processor via DVP.
The cameras are controlled via SCCB which seems to be a name that ...
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Difference between transfer gate and NMOS switch in CMOS image sensors
I would like to know the difference between the transfer gate (TX) which is used in 4T CMOS Active Pixel Sensor (APS) as mentioned in the below image and a normal NMOS switch.
As far as I know, the ...
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Is the charge accumulation linear in time for image sensors?
Reformulating the question:
Does the rate of charge of the pixels photodiodes in an image sensor depends of the previous accumulated charge?
The pixel sensor integrates light during a specific ...
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How to extend detection distance of computer mouse?
I recently learned that modern computer mice take tiny pictures many times a second and compares them to understand in what direction it is heading. And that the little light at the bottom is to ...
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How do you learn about CMOS sensors supporting circuitry
I want to get some resources about CMOS sensors circuitry - less about the sensors themselves and more about how to build supporting circuitry for them.
I couldn't find any reference designs (Do ...
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Interfacing OV7670 camera with STM32F4 (no FIFO)
I have to interface my STM32F401RE with an OV7670 camera module without external AL422. I followed some of the many tutorials for Arduino, and I was able to capture images using Arduino UNO. ...
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How are solar spectra simulators used and are they used to test photo-diodes and image sensors?
For example here is link to a Xenon lamp solar spectra simulator Xenon lamp AAA Class Solar Simulator.
Two spectra are shown in the plot given in the link, one for the AM1.5G reference an other of ...
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Linear image sensor output signal processing
I am working on a circuit reading the TCD1103 image sensor. In the datasheet,
the shown 2 peripheral components are advised.
I wonder if the BJT connected to the OS signal would be neccessary, if an ...
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Abstract signal and noise model for a logarithmic image sensor
A conventional grayscale image sensor pixel can be modeled as a "light bucket." Photons arrive on the sensor pixel for a fixed exposure time. The light bucket fills up with photo-electrons linearly ...
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Fingerprint scanning repeatedly
I am using 2 fingerprint module to make an attendance machine.
Normally i have seen the attendance machines just need the user to put his/her finger on the scanner and it is scanned.. then next ...
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What are these designations on a sensor datasheet?
I'm working with image sensor Anafocus Lince5M.
In its datasheet there are some designations that I can't understand (underlined).
What are these designations?
And how to calculate threshold ...
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Do electronics distributors require NDA or manufacturer consent to buy certain items such as imaging sensors?
I am looking to buy imaging sensors but the manufacturers are reluctant to engage because of low volume production. I don't have an NDA nor any official datasheets. However, there are leaked ...
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What is the response curve of a CMOS sensor cell to the amount of light?
Using my Nikon D5100, shooting RAW pictures and using Darktable to disable absolutely all contrast curves, white balancing, sharpening and even the debayering, I've measured the average value of the ...
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DRAM in a FPGA - Image Sensor design
I am designing the simplest form of a camera: an FPGA that interfaces an image sensor and sends the acquired data to the host device via USB 3.0. There is no processing on the FPGA, it is used for ...
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Overclocking an image sensor for higher FPS
What happens if I overclock an image sensor? For instance the OV7670 (datasheet) which has a rated maximum system clock input (XCLK) of 24 MHz and maximum pixel clock (PCLK) of again 24 MHz. The ...
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Waterproofing MLX90640 far infrared thermal sensor
I would like to use the MLX90640 far infrared thermal sensor array on a car as a "night vision" camera. Since glass blocks thermal radiation I have to install it outside the cabin. Is it possible to ...
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power consumption with MIPI CSI-2 vs parallel interface
I wanted to understand, if MIPI CSI-2(LVDS-like) should result in a larger power consumption than the traditional signle-ended digital parallel interface. The MIPI is widely used today, but the ...
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Synchronizing two OV7670 image sensors
I would like to create a simple frame synchronihed stereo camera. I found there are cheap OV7670 boards (without FIFO memory) that work with Arduino (or compatible) boards - these sensors do not have ...
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Why is the Image Sensor Board routing different?
The below posted is a open source camera project Elphel PCB layout images
I have took their 353 model camera, which is mounted with an Onsemi sensor
I only know that for high speed signals we go ...
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Why is there no rolling shutter when using a mechanical shutter?
So I know it might not be the best place to ask this question, but maybe some of you are familiar with the mechanics of digital mirrorless cameras and the technology of CMOS sensors.
I don't quite ...
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Interfacing with MIPI CSI-2 camera sensors like the Omnivision OV2732?
CSI-2 is used in pretty much every smartphone however I'm struggling to find much information on how most companies receive and control CSI-2 sensors. I understand there are NDAs. This is not for a ...
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Does random access to image sensors require extra hardware?
Jun Ohta's "Smart CMOS image sensor and applications" says that random access to pixel arrays is possible. Using Row parallel readouts and column decoders, one can select which pixels to readout and ...
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Does the Raspberry Pi Camera V2.0 have digital processing in the sensor itself?
The PiCamera documentation (https://picamera.readthedocs.io/en/release-1.13/fov.html#sensor-modes) states that an embedded GPU is used for all sorts of digital processing, including digital gain, ...
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What does "IF" in "IF voltage" stand for?
In the following sensor datasheet (https://github.com/rellimmot/Sony-IMX219-Raspberry-Pi-V2-CMOS/blob/master/IMX219PQH5_Module_Design_Reference_Manual_ver2.2_140425.pdf), it details the supply ...
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What is the advantages of InGaAs infrared image sensors? [closed]
I am currently searching the InGaAs material for infrared imaging usage. I have read some papers about it. It seems a new one. But I can not get real advantages of it, yet. What is the basic reason(...
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