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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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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Camera sensor OV5642

I'm currently looking to replace an OV5642 camera sensor with an alternative where I could use the same private software that belongs to a different owner. I came across the OV5640 sensor, but 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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What is the difference CMOS and CCD image sensors? In terms of Infrared spectrum [closed]

What is the difference between CMOS and CCD image sensor arrays? i.e working principles. Please consider in infrared spectrum. Which one's fabrication is expensive/ or cheap ? Which one gives ...
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CCD sensor: Digital Counts vs Exposure plot vs Dark Digital Counts

First, my question concerns an individual pixel/sensor from a CCD array of a digital camera. From my understanding, the Digital Counts is linear with Exposure time. However, this line will be ...
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Tracking Down a Datasheet for an unknown Optical Sensor

I scavenged an optical sensor out of a wireless mouse I had, and now I'm trying to track down the data sheet. Honestly, the pinout (from what I could determine looking at the board in which it was ...
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Is it possible to take a picture from a paper with infrared image sensor without lighting? [closed]

I'm going to make a device which will take a picture from a paper which contains a line of English characters and then process the picture with OCR to get some information in micro-controller. My idea ...
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In what direction is the photodiode placed in a CMOS image sensor?

I am currently trying to understand how a CMOS Active Pixel Sensor (APS) works. I came across two different diagrams (one in a presentation, the other one from wikipedia). Which is the correct way to ...
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Is it guaranteed that fingerprint data taken by a scanner can be reused by another scanner? [closed]

I want to create a system that records employee attendance with optical finger scanner. Because the scanner has a limited lifetime, replacement with the same kind in the future might be impossible due ...
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Optical Track Sensor PMT9101 and PIC18f2xk22 - SPI Communication

I come back wih a new questions, I tried to communicate with my sensor(slave) but he is not responding at all. My first question is : Do I need to do the Power-Up Sequence explained in the datasheet ...
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