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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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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77 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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80 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 ...
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111 views

What image sensors can I use with Atmel's ISI interface on a SAM9G25?

Atmel's SAM9G25 includes an "Image Sensor Interface" peripheral, which is nicely documented, and "...can be used to connect various image sensors". What I am struggling with is: 1) How do I find ...
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2answers
299 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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251 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
82 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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73 views

Guidance on CCD interfacing

I've been playing with the CCD from an Ixy 60 camera, purely out of interest. I think I've identified the Vout signal from the CCD. However it only seems to change with global illumination. You can ...
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2answers
94 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
99 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 ...
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0answers
105 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 ...
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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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135 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 ...
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1answer
2k 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
122 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
66 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
349 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
76 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
219 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 ...
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1answer
77 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 ...
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1answer
177 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) ...
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1answer
86 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 ...
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1answer
150 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) ...
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1answer
543 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 ...
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1answer
94 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 ...
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3answers
868 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 ...
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1answer
334 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 ...
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5answers
520 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. ...
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2answers
1k 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 ...
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1answer
638 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 ...