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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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 single image sensor with two different image signal processors

I have two different devices. Both of them have CMOS parallel camera input interface. I am trying to connect the same CMOS sensor with both devices at the same time. I am thinking about using a CMOS ...
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55 views

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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37 views

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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138 views

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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58 views

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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291 views

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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27 views

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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99 views

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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76 views

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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139 views

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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75 views

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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211 views

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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106 views

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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356 views

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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396 views

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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250 views

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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238 views

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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95 views

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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153 views

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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117 views

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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265 views

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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146 views

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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47 views

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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1k views

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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88 views

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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201 views

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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212 views

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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160 views

Largest spectrum image sensor and processing its entire spectrum image

I was developing a digital system to process raw images stemming from an image sensor but I would like to deal with "universal" (as possible) spectrum image sensors with no filter. I know that for ...
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717 views

Is there a light sensor that varies output with wavelength?

What components are sensitive to the wavelength (energy) of impinging light? I am wondering if there are any that have a reliable and detectable response to wavelength instead of just intensity. For ...
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814 views

Building your own camera module [closed]

I would like to know how difficult it is to build your own camera module. For instance, how difficult would it be to assemble the Raspberry Pi camera module from scratch? The reason I'm interested ...
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960 views

How does the Infineon REAL3™ depth sensing imager chips measure time of flight for each pixel?

tl;dr: How do the REAL3™ depth-sensing imager chips measure time of flight of light for each pixel? Is it quadrature, time-to-amplitude, or something else? The Infineon REAL3™ depth sensing imagers ...
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255 views

Connecting Optical Fignerprint Scanner with Raspberry Pi?

I am new to electronics. I bought Rasberry Pi and a Fingerprint scanner for some project. Now I can't seem to find any details/Specification about the Fingerprint Scanner, and there is nothing ...
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1answer
126 views

Select internal/external DVDD source for OV5640

How to select between internal or external source for the DVDD digital core in OV5640. Do I simply provide voltage to the DVDD pins and if it is more than 1.5V it will automatically use internal LDO ...
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419 views

Are silicon microbolometers inherently more expensive than conventional CMOS light sensors?

We're finally starting to see practical thermal imaging sensors (microbolometers) entering the consumer market. However, they are still vastly more expensive than comparable visible imaging sensors. ...
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176 views

What does yuv420 output mean in camera?

Now I'm reading a datasheet which is ov5642. www.uctronics.com/download/cam_module/OV5642DS.pdf But I can't understand the explain table6-6 format control register of yuv420. Q1.How does yuv420 ...
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597 views

Rainbow artifacts in composite video

Background: I am trying to reverse engineer a small endoscopic camera for a class project. The camera is connected to its own screen, and I do not have the specs for either. Thus far I have learned ...
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388 views

What is the true reason for the rolling shutter effect on modern CMOS camera?

I was wondering what is the true reason for the rolling shutter effect that can be observed on many CMOS camera. I've done some research on the internet and found an excellent article about it: link. ...
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420 views

OV5642 does not work issue

I've got OV5642 camera module initialize issue. I put 3.3V and 24Mhz XCLK into the camera. I've double checked it. But it does not make a initial work. there is no PCLK output there is no HREF, VSYNC ...
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958 views

What is the difference between sCMOS and CMOS?

I am interested in microscopy applications, and am looking at both sCMOS and CMOS sensors as options. Why are sCMOS sensors so expensive compared to CMOS sensors? What are the benefits, and are they ...
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60 views

In an RGB scene, why can we assume color difference images are band-limited?

A common assumption in image processing is that the difference between two color channels of the same scene are band-limited. For instance, the interpolation method used in Hirakawa's paper ...
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3answers
425 views

Profiling for FPGA requirements for a high-performance camera

I would like to know how to do the profiling of an image acquisition and storing pipeline on an FPGA based system, capturing images from a CMOS image sensor through LVDS interface, do some basic image ...
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186 views

Interface 10 image sensors to Linux CPU

I need to process image data from 10 image sensors simultaneously (namely from OnSemi MT9V022s or similar). All 10 sensors will be externally triggered by a common signal. Ideal solution would be to ...