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38
votes
5answers
9k views

What's the difference between CCD and CMOS image sensors?

I keep reading articles about CCD vs CMOS image sensors. What is the difference between these two types? What exactly do these sensors do in terms of photography? Is a CCD-based camera going to be ...
19
votes
2answers
10k views

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 ...
8
votes
4answers
2k views

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 ...
8
votes
3answers
536 views

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 ...
7
votes
1answer
317 views

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?
5
votes
3answers
2k views

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 ...
4
votes
3answers
988 views

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 ...
3
votes
4answers
777 views

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 ...
3
votes
2answers
89 views

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 ...
3
votes
1answer
144 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. ...
2
votes
2answers
455 views

Xenon flash with rolling shutter

I'm working on a cmos image sensor that has a electronic rolling shutter, at this time I'm operating at 15fps and getting RAW data from it. I was wondering how to combine a xenon flash with the ...
2
votes
2answers
267 views

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 ...
2
votes
1answer
184 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 ...
1
vote
2answers
122 views

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 ...
1
vote
1answer
391 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 ...
1
vote
1answer
109 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 ...
1
vote
1answer
85 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 ...
0
votes
2answers
124 views

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 ...
0
votes
2answers
82 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 ...
0
votes
1answer
102 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 ...
0
votes
1answer
48 views

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) ...
-2
votes
1answer
96 views

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 ...