Questions tagged [cmos-image-sensor]

A technology for making image sensors. Please use this tag only when the question at hand specifically deals with CMOS and not just because a camera happens to have that type of sensor — for general questions on sensors, just use "sensor".

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What causes bright banding in CMOS sensor?

The image capturing condition: dark room mobile phone with maximun screen brightness is in the center of the image there is a reddish band in horizontal direction Does anyone know why the phenomenon ...
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Lens for 1 inch sensor format does not seem to cover the actual sensor boundary

I have a camera which has the Sony IMX267LQR sensor. From the sensor documentation, its diagonal is 16.1 mm and pixel dimensions are 4096 (H) × 2160 (V). The camera manufacturer listed it as 1 inch ...
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Why am I getting horizontal stripes/bands on sensor?

I am experiencing an issue with very apparent stripes on camera readout. Over time, a very pronounced stripe/band pattern started appearing and has a significant impact on image quality. The camera is ...
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pixel binning vs higher individual pixel size

Some smartphone cameras support pixel binning, to switch between high-res and low-light modes. An example would be the S20 ultra, which has an 108MP sensor that can bin pixels on a 3x3 grid, leading ...
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Bayer color effective true resolution [duplicate]

Because in a typical digital camera, each pixel records only one color though use of a Bayer filter or similar mechanism to achieve color vision, the true resolution of a ## megapixel sensor is ...
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1answer
171 views

Why was JFET-LBCAST such a short lived sensor technology?

I have been reading Wikipedia for a while and I realized Nikon developed this technology for a long time for their top of the line DSLR's and then abandoned it in the favor of the CMOS sensors. But ...
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Why hasn't anyone made a 645 or 6 x 6 medium format digital camera CMOS sensor? [duplicate]

I understand that the price of silicon doesn't always scale linearly with its size/number of components, but I'm just genuinely curious as to why we haven't seen any digital camera sensors at true ...
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Why exactly do "CMOS astrophotographers" prefer CMOS sensors?

This answer to How can I avoid star trails without an expensive tracking mount? is consistent with this answer to What is synthetic tracking, and why would a 35 cm Earth imager be 10-30x better than ...
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833 views

How to calculate Sensor Pixel Pitch?

I need to compute the “Sensor Pixel Pitch (in mm/px)” for some calculation. I have the following data available from the manufacturer: Resolution: 1920x1200 Sensor Type: 2/3” CMOS Pixel size: 4.8 x ...
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Why are camera sensors green?

When I look at a CMOS sensor it's green. But CCD sensor. photos in the internet show pink sensors. So what exactly defines the color of an camera sensor? Especially what defines colors of the ...
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Are these stripes bug or not?

Is it normal or not to have such stripes in a photo taken with strong backlight? Photographed on a new Canon 700D, jpeg from CR2.
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861 views

Does on-sensor phase detection autofocus need adjustment for accuracy?

Is autofocus adjustment actually no longer required with on-imaging-sensor autofocus that's phase-detection only i.e. not relying on contrast detection? If not, why? How does lens autofocus adjustment ...
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How does on-sensor phase detection AF not impact the image?

My understanding is that some of the photosites on the sensor have additional functionality in them to measure phase, which in turn uses some of the energy that would have otherwise registered as ...
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Is the color reproduction of different cameras inherent to the sensor or due to software?

Often, reviewers and camera users talk about the 'Color Science' of a particular brand of digital camera, e.g. it is said that Sony digital cameras do not have good skin tones. Is this 'Color Science' ...
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Where can I find an organic photoconductive film (OPF), Camera or Sensor alone?

This technology was announced in 2016, but I couldn't find any trace or update about it later. Is there any camera using it ? If not how can I buy any from Panasonic/Fujifilm ?
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Active array, Optical Black region and non-microlensed region in CMOS sensor

I came across this fascinating website that takes a very close look at a CMOS sensor. I want to make sure that I understand the optical black (OB) region and the active pixel array. I marked these two ...
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523 views

Do I need to take bias frames for long exposure astrophotography?

I have read many places that for the best calibrated astrophotographs, you should be taking bias frames, dark frames, and flat frames. But on a forum I read the following statement You usually don'...
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293 views

How is ISO and output communicated on CMOS sensors?

CMOS sensors have analog amplifiers for each pixel. To my understanding, the pixels are set on a single wafer which can only handle one communication at a time. ISO values are most likely sent out ...
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1answer
996 views

Why do my camera's specs give a 120 degree angle of view when I calculate it should be much narrower than that?

I have a camera with these specs Image sensor = 1/4' OV CMOS Sensor Image Resolution: 1280*1024,640*480,320*240,160*120 Focal Length: 2.8mm Angle of view: 120 Since it's a 1/4 CMOS i got the width ...
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Why aren't square CMOS sensors more popular by now? [duplicate]

For anyone who has ever delved into the world of Medium Format Photography, they will undoubtedly understand some of the benefits of using a square format over a rectangle format when creating photos. ...
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1answer
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Difference between a "camera at three broad spectral bands" (sic.) and a standard RGB camera?

I am doing a research that involves aerial photography, specifically forest surveying. In one paper, "Automated tree crown delineation from imagery based on morphological techniques", I found this ...
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What are the bottlenecks in a regular CMOS sensor chip?

To be clear I'm not referring to any processing stage but just hardware. What is preventing me from sampling it at a higher rate? Will it burn out or just start giving me garbage? What is the reason ...
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difference between APS -C sensor and CMOS sensor

I am a newbee to photography and planning to get my hands dirty on DSLR camera, different people come and give difference suggestion. However i am curious about knowing the difference between the APS-...
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4answers
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What is the difference between MOS and CMOS?

The Panasonic Lumix DMC-FZ1000 has, according to the specs, a MOS image sensor - while cameras usually have CMOS (or CCD, for that matter). Is there any difference between MOS and CMOS? Or is this a ...
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1answer
287 views

The CCTV cameras that show black and white images, do they have bayer filters attached on their CCD/CMOS image sensors?

I need a black and white camera. Since the cameras in the market, the ones available for astro-photography are quite costly, I am thinking of converting a digital camera to black and white. I see that ...
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Native ISO vs Boost ISO. What kind of amplification corresponds to each of them?

As I understood, there's a native range for ISO in DSLR cameras and a boost mode which is usually a bigger range and contains the native ISO. I'm lost a bit here. Which of the following processes is ...
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Is it OK to clean a DSLR's CMOS (with filter removed) with compressed air spray?

Is is OK to remove dust from the DSLR's CMOS (No filter or glass on top of it) using compressed air spray?
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621 views

What exactly does the trigger pin do on CMOS sensors? [closed]

I see many CMOS sensors with the pin called trigger. WHat exactly does this pin do ? What is it used for in a camera? My knowledge about CMOS sensors is not extensive. As far as i know the trigger I ...
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367 views

Why does the Canon 450D have only 14bit depth RAW images?

According to 3.4.2. section "data precision" on this website, the Canon 450D has 14bit deph. Canon CR2 stores RAW data as JPEG Lossless format. Image size: 4312x2876 CFA: 4313x2877 (bayer sensor ...
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Readout time vs Frame rate of CMOS sensor

In many articles about CMOS sensor, I usually find that the relationship between readout time and frame rate is: (1) Readout time=1/Frame rate But Jia, C., & Evans, B. L. (2013, December) ...
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864 views

When does the first row of the next frame of CMOS sensor begin its exposure?

I want to ask about the starting time of a new frame in a sequence of frames captured by a CMOS sensor. Assume that the readout time of the entire sensor is 10ms, and the exposure time is less than ...
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1answer
1k views

What causes chroma noise in an image sensor

I'm trying to understand what is causing chroma noise in an image sensor, specifically why it is so visible when the ISO is set to a very high value (which for CMOS I guess means that there is an ...
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495 views

Imbalance in green pixels

Question in brief: at a sensor level what are the typical causes of an unequal response between adjacent green pixels? Background: I'm experimenting with a sensor, which is typically deployed in the ...
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What determines the fastest shutter speed for an electronic shutter?

I tried my luck over at Robotics but didn't have any luck finding somebody knowledgeable. Somebody therefore suggested to post the question here again. I understand that there are different types of ...
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How is the spectral response of a camera typically measured?

I cannot find any resources that detail a standardized method of measuring the spectral response of a camera. Does such a standard exist? Does anyone know how to do this? To give some context, I'm ...
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Is it possible to modify a camera by changing cmos sensor?

I am currently looking at using a Basler Ace series camera (part no. acA3800-14um) which comes with the Aptina MT9J003 CMOS sensor. My question is, how easy would it be to change this sensor for ...
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733 views

What should I expect in maintenance costs after shutter failure for a DSLR?

I know that the shutter could fail on one of my first images, or it could keep going strong hundreds of thousands more, and that a typical Nikon shutter replacement runs anywhere from $250-400 USD. ...
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1answer
237 views

What causes darker areas on a still from a video stream when moving light source has passed through the image just before it has been taken?

When taking stills from a IP CCTV camera (Axis P1357-E) in low light (night) conditions of a moving vehicle, I am getting circular dark patches where the vehicle headlights have lit up the road. As ...
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CCD sensors use a digital shutter. Why don't the more expensive CMOS sensors?

This answer mentions that CMOS sensors "cannot" use digital shutters where as CCD sensors can. Even if some models have the ability to, it is certainly typically for CMOS sensors to use mechanical ...
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What is CMOS in SLR camera? [duplicate]

I regularly come across this term "Dual Pixel CMOS AF" or "APS HD CMOS" when reading about cameras. So what is this CMOS term? What does it describe about the camera? Is it telling something that it ...
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1answer
570 views

Measure rolling shutter severity of image sensor scientifically [closed]

Is there a way how to measure the "severity" of the rolling shutter (RS) effect for a given image sensor? By severity I mean how slow the image read-out is done for every single frame. The slower the ...
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Why does increasing sensor size necessarily lead to lower silicon wafer utilization?

MichaelT posted an answer to the question "What limits the size of digital imaging sensors?" which included this illustration of why increasing the size of the sensor leads to an increase of wasted ...
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What limits the size of digital imaging sensors?

I've read some information about sensor sizes here http://en.wikipedia.org/wiki/Image_sensor_format according to this, the 35mm ff-CMOS is the sensor with the largest dimensions used in digital ...
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What causes banding noise in CMOS sensors?

I'm looking for information (and references) on three related topics: What causes banding noise in CMOS sensors? What is the physical/technological cause? Is the cause the same in CCD and CMOS ...
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How linear are DSLR sensors?

To be more precise, let's say we are taking a W&B photograph. Picture 1 : And let's say we take it once with a 1/1000 shutter speed, so that the values for R/G/B range from 0 to MAXVALUE / 2 ...
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How common are hot pixels on new cameras?

How common are hot pixels on new cameras?! I read that people may check up to 5 cameras at stores to actually find a perfect one, is this true? so how commons is this? what is the chance of getting a ...
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Variable ISO Sensor: Possible and/or Useful?

This answer to the question about how ISO is implemented in digital cameras seems to imply that each photosite (i.e., pixel) can have its ISO set independently. If this is true, then I would think ...
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What are the advantages or disadvantages of a back illuminated CMOS sensor?

The iPhone 4s uses a backlit CMOS sensor, and I have noticed that some other point and shoot cameras do as well. What does that mean for photography, and if it is a benefit why do DSLR cameras not use ...
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495 views

How do I diagnose possible damage to my D70 sensor after an attempted IR conversion?

I tried to convert my Nikon D70 into IR, and after replacing the filter and reassembling the camera, I am unable to take any new pictures. I am able to see pictures that were previously present on the ...
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Are there bad effects of frequent pixel-mapping?

I read on two different sites that pixel mapping should be done once or twice a year. But sometimes I end up doing it once a month. Will it have adverse effect on the CMOS image sensor?