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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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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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73 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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98 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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Choosing a camera for near-infra-red illumination analysis

Which parameters are important to look for in camera specs./data-sheets if it will be used for irradiance pattern analysis from near infra-red sources. Typical spectra range of interest is from ~700nm ...
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1answer
66 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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CCD output buffer

Reading the KAF-8300 CCD datasheet, I came across what looks like an emitter-follower to buffer the analog video output, see below: Also from the datasheet: Charge presented to the floating ...
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93 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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87 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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108 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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241 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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1answer
117 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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3answers
132 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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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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395 views

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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How is the lens assembly done for an image sensor?

Digital camera has two main parts: Image sensor Lens assembly I want to know about the process of integration of an image sensor with the assembly?
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62 views

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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1answer
120 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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2answers
116 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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137 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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1answer
130 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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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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1answer
576 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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1answer
83 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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1answer
159 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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1answer
154 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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2answers
144 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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4answers
425 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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176 views

Does pixel binning mitigate the rolling shutter effect?

Does pixel binning help to mitigate the rolling shutter effect of a full resolution capture? The idea behind this would be that when binned there is fewer data for readout and thus the image readout ...
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1answer
615 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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2answers
828 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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1answer
227 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
72 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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3answers
342 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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1answer
138 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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1answer
426 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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What sensors could augment image sensors and accelerate time of detecting basketball 100 feet away?

The goal is to detect and track the movement of a basketball from ~100 feet away. Computer vision can do this, but it's computationally expensive. Could other sensors augment image sensors and ...
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2answers
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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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1answer
363 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, ...
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1answer
772 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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1answer
58 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
353 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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1answer
168 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 ...
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1answer
67 views

Analyse images before storing them in memory [closed]

Physicist here, so please be gentle ;-) I am designing a device to acquire in a few seconds a large amounts of images (a few terabytes), that then need to be analysed, possibly on the fly. Is there a ...
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1answer
425 views

Is there an FPGA chip that has a built-in image sensor (or vice versa)? [closed]

I would like to have an FPGA chip that is tightly connected to an image sensor. Ideally I would like to read all image columns (or rows) in parallel straight into the FPGA. Does such hardware exist?
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Building a VGA circuit

I am building an 8 bit VGA circuit and have 3 choices. One is to use a simple resistor network to convert digital to analog. The second is to use an op-amp. The third way to do this is to use a device ...
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2answers
154 views

How does IR thermal vision work?

How are IR thermal-vision devices able to present us with "invisible" imagery in such a way that we can actually interpret it? What I'm really trying to wrap my head around is: How a sensor can "...
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2answers
78 views

What sizes are detectable from 1m using a fairly good cmos camera?

I haven't ordered a CMOS camera module yet, but I am planning to use it to detect a small object from ~1-1.5 meters. Just too be specific, say I am using the following CMOS camera (although if you ...
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2answers
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How to detect a human behind the glass? [closed]

I am challenged with a task of detecting a human from behind the glass. Could you please suggest what kind of sensor will be a good fit for the job? A sensor can only be mounted on the inside of the ...