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 (...

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39 views

What is the OV5642's pixel clock?

I'm trying to implement with OV5642 omnivision's ov5642 in the FPGA. it has the input clock 6~27Mhz. But there is no any information about the pixel clock. I have to know the pixel clock to interface ...
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0answers
12 views

What size xilin's fifo do I need to transfer to host PC by using USB3.0?

Now I'm trying to implement with OV5642 image sensor and FPGA and USB3.0. I want to send the image data to host PC by using slave fifo of the usb3.0. The image size is 2592x1944 15fps. But I'm not ...
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3answers
84 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
52 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
60 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
87 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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2answers
168 views

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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0answers
46 views

Image Sensor module for capsule endoscope

I am building a endoscopic capsule.With a variety of options for image sensors out there I am not sure how to choose one.OV2640 seems to be a popular choice amongst hobbyist using the sensor directly. ...
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2answers
70 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
62 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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3answers
153 views

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 ...
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1answer
486 views

black level calibration in image sensor

For one camera, the black level of the sensor will make the output non-zero when it is covered. For example the output of the sensor is 10bit and black level is 63, if the output is reduced by black ...
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1answer
148 views

How fast cpu clock do you need to control camera?

I'm making a camera system with CMOS image sensor and micro controller. But I don't know yet how fast cpu clock I need. Assuming that I use 5MP cmos image sensor and take just still image with 1fps, ...
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1answer
96 views

How do image sensors output in different resolutions?

Say an image sensor has an array size of 1280 x 800 pixels. Its specifications state that it has output support for the following resolutions: WXGA (1280 x 800) and VGA (640 x 480). My question is ...
2
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2answers
528 views

How does 3D Time-of-Flight (TOF) camera work?

This is my first post in this forum! So Point me if anything is not clear! I want to know how TOF camera works? So I've done Google & read some nice explanation about How Phase difference between ...
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1answer
622 views

Raw RGB from CMOS image sensor to grayscale conversion

I am trying to produce an image with OV7740 color image sensor. As far as I know, the sensor is configured by default to provide 10bit parallel RAW RGB data (due to an on-chip Bayer filter). How ...
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1answer
132 views

CCD Reset switch and sense capacitor

I'm trying to understand the circuit in figure 1 of this document which describes CCD interfacing (http://www.analog.com/library/analogdialogue/archives/32-1/signal_pro.html). Shown below: My ...
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2answers
152 views

Is using a display panel as a light sensor conceivable?

Though the question may sound naïve at first, I still wonder if it would somehow be possible to use an LCD/TFT/OLED or other Panel as an image-sensor. From my understanding of how these kinds of ...
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2answers
195 views

Image Sensor sensitivity

I am not sure what really the term "sensitivity" means when characterizing image sensors, so I will describe what I am looking for in the sensor at the following conditions: the exposure time is ...
1
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0answers
131 views

Video streaming from image processor

The project I'm working on involves streaming video from an image sensor to an LCD, preferably as cheaply as possible. My question is: can I get an image processor/sensor SOC (a la https://www.aptina....
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4answers
4k views

Why is it so expensive to produce cameras for non visible light?

Typical consumer cameras can capture wavelength of 390-700 nm 400-1050nm . But why is it so difficult and expensive to produce cameras for infrared, ultraviolet, hard x-rays, etc.? The only thing ...
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2answers
279 views

How to filter out everything except the laser light using linear array sensor

I use iC-LF1401 to capture line 128 x 1 in horizontal position. Parallel to this linear sensor, I've mounted linear laser (vertical light). How can I filter out linear sensor output, clear all except ...
2
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1answer
3k views

Raspberry Pi stereo camera frame synchronization/genlock (video or still image)

I need to frame synchronize a stereo camera for a computer vision application. The synchronization should the best possible, hopefully on a millisecond level. I would like to get about 10 FPS either ...
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2answers
174 views

Understanding optical parameters of image sensors

I noticed that image sensor manufacturers provide some optical characteristics in different formats. I wish to know how to interpret that information. Sensitivity is characterized in \$\dfrac{V}{lx \...
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1answer
72 views

Image sensor resolution

I am not sure how to ask this question. Hopefully, I will edit it to make better sense as we go. I have an image with 10 μm wide black and white stripes and I project it onto the imager, with 1000 ...
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2answers
354 views

Noise at 2^n transitions

I am sampling a video signal from a linear imager. I noticed when the illumination is just at the intensity when the ADC increases by another MSB bit at the output, the noise occurs. That is, when ADC ...
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1answer
118 views

How do they read out HD, high frame rate CCD image sensors

Having little experience with CCD image sensors, I have learned that reading pixels via shift registers from a relatively large size CCD must be fast to achieve some reasonable frame rate. Let's say, ...
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2answers
305 views

Digital camera sensors and long exposures

Why do digital cameras need a long exposure time in low light conditions? Sometimes the exposures are 15-30 seconds or longer. Doesn't the electronic sensor achieve a steady state under 1 second or so?...
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1answer
95 views

What is the appropriate name for camera modules/sensors? And what kind of supporting circuirty is needed?

I have seen CMOS Imaging Sensors (OmniVision, Aptina, ST, etc) as well as Camera modules (like the ones in smartphones; e-con, OmniVision, etc), and I know there are the finished product cameras (...
4
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1answer
284 views

High-Sensitivity, Low-Latency Imaging Sensor

This might be a bit of a long shot for this venue, but: I'm looking into sensors for a scientific imaging application where the key is excellent sensitivity (quantum efficiency and noise performance) ...
2
votes
1answer
89 views

Thoughts on making a hand-held OCR

I have an electronic project about a OCR that could be held in hand and used like a Tipp-Ex mouse (image) to scan words. As I am an amateur in electronics, I don't really know what sensor(s) I can use ...
0
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1answer
201 views

Calculate EMVA1288 temporal dark noise

Say I have a dark current plot (image mean over shutter time) with an offset (y-intercept) of 4100 and system gain K = 4.23, is the following calculation correct? Variance of dark signal = sqrt(4100) ...
1
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1answer
762 views

DIY: What is required in order to save a picture captured from a CMOS image sensor to a digital format?

I have a need to programmatically capture HD pictures (2 MP or better) under predictable lighting from at least 8 locations. Buying multiple cameras is not only expensive, but does not allow me to ...
2
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1answer
106 views

EMVA standard 1288 SNR formula (equation 11)

I'm trying to understand equation 11 for Signal-to-Noise Ratio in EMVA standard 1288 Release Candidate 3.1: http://www.emva.org/cms/upload/Standards/Stadard_1288/EMVA1288-3.1rc.pdf page 7. Using ...
3
votes
3answers
1k views

Raw access to CMOS image sensor?

I am interested in developing an idea using CMOS sensors, and I was wondering if I could get some pointers (I don't know much about image sensors) First, my understanding is that CMOS image sensors ...
2
votes
1answer
446 views

Color binning on Bayer sensor

Is there a difference between doing binning on a Bayer sensor before or after the ADC with respect to spatial information lost? How the debayering works should not matter, Assuming the same method ...
3
votes
5answers
659 views

image sensor line problem

I have an image sensor problem and I am looking everywhere to identify the problem but couldn't. Attached is the problem I observe. As you can see there are several horizontal lines in the image. ...
2
votes
2answers
2k views

Detecting absolute position

I am working on project that requires me to detect the position of a pen on a piece of normal paper. My first thought was to use 4 IR LEDs on a receiving unit set at the top of the page, and to put ...
0
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1answer
772 views

How CIS (contact Image sensor ) works?

I'm working on a project that needs a CIS sensor All I can understand that this sensor output an analogue signal that I take on ADC & store the data & process on it . I will use this ROHM ...