Imaging Developer Claims Massive Low-Light Improvements

By: Brian Karas, Published on Jul 27, 2016

In the early days of megapixel, binning was a crutch used to compensate for poor low-light performance. Low-light sensitivity improvements have mostly eliminated the need for binning, but one company has an interesting argument for bringing it back.

We had a conversation with Rick Puetter, the Chief Scientist at Pixon Imaging about their "intelligent" binning approach, which they call ExDRA (Extended Dynamic Range Architecture).

This report examines Pixon's technology and its potential in the security market

** *** ***** **** of *********, ******* *** a ****** **** ** compensate *** **** ***-***** performance. ***-***** *********** ************ have ****** ********** *** need *** *******, *** one ******* *** ** interesting ******** *** ******** it ****.

** *** * ************ with**** *******, *** ***** ********* at***** ************ ***** "***********" ******* approach, ***** **** **** ExDRA (******** ******* ***** Architecture).

**** ****** ******** *****'* technology *** *** ********* in *** ******** ******

[***************]

ExDRA ********

**** **** *****-******** ***, ExDRA ***** *** ** more ****** ** * scene *** ******** ******** of **** ** ****** a ****** ***** **** presents **** *********** ** the ******. ***** *** combines ******** ** ****** with ********* *********, ***** combines ******** ** ********* resolutions. *** *******, * 4MP ***** ***** **** portions ** *** ***** with **** ******** ******** with **** **** * 1MP ****** ***** **** had ****** ******.

*** ******* *** *** ExDRA, **** *********** *******, is ** ********** *** poor ***-*****. ***** *** be *********** ******* ******** lighting ***** ***** ***** levels.

***** ******** *** ********* image ** * ************** example ** *** ***** technology *** ******* ** image **** ***** **** otherwise **** ************:

Pros *** **** ** *****

*** ******* ******** ** ExDRA ** **** ** reduces ********** ** ******** of *** ***** **** activated. ***** **** *** resultant ***** ** ***** better ******* **** *** native *****, ***** ***** have ****** ****** ** those ***** ******.

***** **** ******** ************** to ****** ******* ** add ********** ********** ** allow *** ******** ***** of *** **** ********** charges.

***** **** ************ ***** should *** ******** **** other ****** ******** **** WDR ** ************/***********/*********** ***** low-light *********** ************.

*** ******** ** ** ExDRA ***** **** **** the **** ***** ******** and *** **** ******* in ****, *********** ******** or ********* ********* **** in * *** *****. ExDRA **** **** *** require * **** *******, which ********** ******-****.

How ***** ** ***********

*** **** ** ***** is * *** ** image ********** ********** **** work ** ****** ******** samples ** *** **** electrical ******* ****** *** of ** ***** ******. However, ******** ****** ******* prevent ****, ** *** electrical ******* *** ********* as **** ** *** process ** ******* ****. To ******* ****, ***** developed ********** ****** ****** components **** ***** *** same ********** ******* ** be **** ******** *****, once ******* *******, *** then * ** **** additional ***** ** ** image ****** ********* **** (2x2, ***, ***.) ** necessary.

*** ********** ****** ****** requirements ***** *** *** significant **** ** ******* sensor ****** *** **********, according ** *****, *** this **** ******* ***** from ***** *********** ** existing ****** *******.

What ***** ** *******

*** ******* ***** ** license *** ***** ********** algorithms, *** ************* ****** designs ** ********* **** Sony ** ****** **** produce ***** *******. *** license ***** ***** ** a "****** ***** ******* of *** ****** ****", according ** *** ***** Scientist.

Pixon ********

***** ** * ******** of********, ** *********** *&* and ************* ******* ***** in **********. ***** *** other ******* *********** ************, such ** ***** ********* or **** ******* ** images. ***** ** * result ** ******** ******** in ****, *** *** only **** ******** ******** since ~***** ****.

*** ******* ***** ** license *** ********** **** a **** ******* ** sensors, **** ******-***** ******* to ******** *** ******* vision *******. *** ** their ********** ****** ****** of ********* *****, ***** are *** *************** ** the ********** *** ** a ******** *******, *** no *********** ******** ** 2016.

ExDRA *******

** **** ********* *** tested *****, *** ** represents *** *********** ******** to ********* *********** ** low-light. ** ***** *** convince ****** ************* ** adapt ***** ******* *********** ExDRA ***** ***** ******** in *** ******** ******.

Comments (20)

Are these gains theoretical only at this stage, is there a working prototype?

Why wouldn't the additional noise generated by the extra readouts of the charges outweigh the benefits of the selective binning?

If there are any on-die changes to the substrate, wouldn't these possibly reduce the fill factor as well, offsetting gains?

If Rick is monitoring, I'm curious if he has seen this patent and can comment on the similarities and differences between his own...

We think that given market direction, the biggest impact will be in CMOS sensors. No one builds something like this right now, although charge domain binning in CMOS has been done before, and the technology is proven. We have performed the multiple binning in CCDs in our lab, and the actual gains are exactly what you'd predict theoretically. Not surprising. This is not rocket science and astronomers (like me) have been doing sensor binning for decades to increase low-light sensitivity. The new idea here is to do multiple, different binnings in a single exposure without performing a distractive read between the different binnings, and then to use the best parts of the multiply-binned exposures to form the very best image available.

Thanks Rick.

Can you clarify these statements?

Pixon developed additional sensor design components that allow the same electrical charges to be read multiple times, once without binning, and then 1 or more additional times as an image binned different ways (2x2, 3x3, etc.) as necessary

and

The new idea here is to do multiple, different binnings in a single exposure without performing a distractive read between the different binnings

Are you saying there are multiple reads between binnings or not?

Hi. I'll try to clarify. Regarding the "additional sensor design components", there are lots of possibilities. And frankly, what will be implemented would be up to a licensee of our technology. Concerning the binning and readout scheme, again there are multiple possibilities. But illustrate with one of the simplest. Here the sensor would be exposed and readout as usual. Then, without reseting the collected charges, charges in a group of pixels would be binned on the gate of a single output amplifier and the sensor would be readout again. The sensor is then reset and is ready for another exposure. So in this example there are two binnings per exposure, one readout for each binning, followed by sensor charge reset.

Here the sensor would be exposed and readout as usual. Then, without reseting the collected charges, charges in a group of pixels would be binned on the gate of a single output amplifier and the sensor would be readout again.

Thanks. So what I was trying to ask originally, in imprecise language no doubt, was whether the noise generated from the first read degrades the charge read out in the second read.

Ah. Thanks for the clarification. No, the noise of the first read should not contaminate. It is a voltage noise in the readout amplifier, but it should not generate any signal charge that is collected on the gate of the amplifier(s). So the charge signal is uncorrupted. When the charge is binned and regathered on another amplifier gate the noise voltage associated with the new readout is different, independent, and the level of noise generated is that associated with, and typical of, a single amplifier read.

No, the noise of the first read should not contaminate.

Generally speaking, we hear that "the act of measuring alters that which it measures", imperceptibly in everyday experience, e.g. a tire pressure gauge must let some air out of the tire to get a reading, but in a quantum system this can be quite significant.

Does this not apply to multiple readouts (measurements), or is it an insignificant effect?

No. I am a physicist and understand what you are saying. But this acts as a semi-classical system. The charge is preserved. If the transfer is efficient (in CCDs the transfer is 99.999%, or so, efficient), meaning that charge is not lost, we are okay. Now CMOS devices are not that efficient since the voltages (and wells) are not that large (deep). Still, charge is nearly 100% preserved, and signal is not lost. FET gates in CMOS devices are classical devices, and have very high resistance, meaning that there is no leakage or loss (or addition) of charge. And the noise associated in reading the unit cell is transitory and doesn't affect the charge on the amplifier gate. All in all, this doesn't act like a "quantum system" in the sense of measurement affecting the system, or change in signal charge. And measurement uncertainties don't enter here, with the exception that there are read noises when the FET is read due to various noise processes. And depending on the sophistication of the readout circuitry, and the unit cell architecture, some of this noise can be measured and cancelled (e.g., CKT noise, etc.)

Thanks, that makes sense.

One thing I'm curious about, what about inpixel FPN fixed pattern noise readouts, (for noise reduction) which can't be measured with out charge destruction? Do you do without them in the non-binned readouts or somehow capture a single FPN reading (per frame) applicable to all the readouts?

Hope I'm making sense. :)

Fixed pattern noise is always a problem. But this can be corrected if one takes care. And no, we want to measure this if possible, and perform all the corrections that we can. Also, the fixed pattern noise will be reduced in the binned images, as binning is sort of a averaging procedure. Still this is a concern and needs to be respected.

My brain just melted.

Doesn't Sony have this in there ultra low light cameras?

Not sure, but I just saw this video using a new Starvis Sensor.

Looks like a nice sensor, but what kind of product name begins "Starv"?

Clip was made from Analog output at 480 lines

they sad for now

Благодарим Вас за перевод.

That funny comrade :)

No, Sony doesn't have this in their low-light sensors. They do perform charge-domain charge transfer, however, the technology needed for ExDRA. However Sony uses this to perform global shuttering on their devices. They transfer charge, but do not bin them.

Any progress getting this adopted in the industry?

Hi Luis. No, we have not yet been successful in having this adopted. We have presented it to multiple significant players. Some were quite interested, but were not capable of integrating this in their product. Others show adequate capability to adopt it, showed modest interest, but were too busy bringing out new features of their own to which they were already committed. But we haven't given up, and are looking into ways to ease the barrier to adoption.

What’s your take on this imager/camera?

Canons New 4 Million ISO 2MP Camera

Do you think it’s all they say? Is the price likely to come down significantly?

Login to read this IPVM report.
Why do I need to log in?
IPVM conducts unique testing and research funded by member's payments enabling us to offer the most independent, accurate and in-depth information.

Related Reports on WDR

Verkada Video Quality Problems Tested on May 23, 2019
Verkada suffers from numerous video quality problems, not found in commercial IP cameras, new IPVM testing of Verkada vs Axis and Hikvision...
Axis ~$150 Outdoor Camera Tested on May 21, 2019
Axis has released the latest in their Companion camera line, the outdoor Companion Dome Mini LE, a 1080p integrated IR model aiming to compete with...
Panasonic 32MP Multi Imager Camera Tested (WV-X8570N) on May 16, 2019
Panasonic has released their first multi imager models including the 32MP (4x4K) WV-X8570N, claiming "Extreme image quality for evidence capturing...
Bank Security Manager Interview on May 15, 2019
Bank security contends with many significant threats - from fraudsters to robbers and more. In this interview, IPVM spoke with bank security...
Verkada Cloud VMS/Cameras Tested on May 02, 2019
Verkada is arguably the most ambitious video surveillance startup in many years. The company is developing their own cameras, their own VMS, their...
Dahua Repositionable IR Multi-Imager Camera Tested on Apr 16, 2019
Dahua has released their first repositionable multi-imager camera, the Multi-Flex 4x2MP, claiming integrated IR, true WDR, and flexible...
Axis ARTPEC-7 Chip Release Examined on Apr 08, 2019
For years, Axis essentially de-promoted their own chips. Now, they are reversing course. Axis has announced ARTPEC-7, their latest chip, which...
Axis 5MP P Vs Q Camera Shootout (P3227-LVE vs Q3517-LVE) on Apr 02, 2019
While Axis' Q3517-LVE tested well, it is one of Axis' most expensive dome cameras, over $1,000 USD. Because of this, members asked us how it...
Covert IP Camera Shootout - Axis, Hanwha, Hikvision, March, Vivotek on Mar 20, 2019
Covert cameras were one of the last holdout areas for analog cameras. However, in the past few years, IP / HD covert cameras have become...
Pelco GFC 4K Dome Camera Tested (IMP831-1ERS) on Mar 12, 2019
Pelco has finally released their first 4K IP camera, after years of competitors' releases. Is this move too late? Or is their new GFC Professional...

Most Recent Industry Reports

NJ Law Requires Apprenticeship For Public Works Integrators on May 24, 2019
Few integrators do a formal apprenticeship program. However, now a NJ law is requiring any integrator on public works projects (such as state...
Security / Privacy Journalist Sam Pfeifle Interview on May 24, 2019
Sam Pfeifle is best known as the outspoken former Editor of Security Systems News. After that, he was publications director at the International...
Verkada Video Quality Problems Tested on May 23, 2019
Verkada suffers from numerous video quality problems, not found in commercial IP cameras, new IPVM testing of Verkada vs Axis and Hikvision...
Average Frame Rate Video Surveillance 2019 on May 23, 2019
What is the average frame rated used in video surveillance systems? In IPVM's 2011 statistics, the average was 6-8fps increasing to ~10fps in...
Access Control Job Walk Guide on May 22, 2019
Significant money can be saved and problems avoided with an access control job walk if you know what to look for and what to ask. By inviting...
ASCMA / Monitronics Declares Chapter 11 Bankruptcy Plan on May 22, 2019
Monitronics is entering into Chapter 11 bankruptcy. The company, also called Ascent Capital Group Inc., aka ASCMA, aka Brinks Home Security,...
US Considers Sanctions Against Hikvision and Dahua on May 22, 2019
The US government is considering blacklisting "up to 5" PRC surveillance firms, including Hikvision and Dahua, Bloomberg reported, with human...
Dahua USA Celebrates 5 Years of Errors on May 21, 2019
Dahua USA is, in their own words, 'celebrating' 5 years in North America or as trade magazine SSN declared: Dahua Technology finds success in...
Axis ~$150 Outdoor Camera Tested on May 21, 2019
Axis has released the latest in their Companion camera line, the outdoor Companion Dome Mini LE, a 1080p integrated IR model aiming to compete with...
Covert Facial Recognition Using Axis and Amazon By NYTimes on May 20, 2019
What if you took a 33MP Axis camera covering one of the busiest parks in the US and ran Amazon Facial Recognition against it? That is what the...

The world's leading video surveillance information source, IPVM provides the best reporting, testing and training for 10,000+ members globally. Dedicated to independent and objective information, we uniquely refuse any and all advertisements, sponsorship and consulting from manufacturers.

About | FAQ | Contact