Kodak aims for 5-megapixel phone cameras

Kodak says its new 5-megapixel sensor will fit in the small camera packages of mainstream mobile phones.

(Credit: Kodak)

Eastman Kodak hopes turning one aspect of chip design on its head will help improve cell phone cameras--or at least help their image quality catch up with their megapixel increases.

"We believe we've created a new camera sensor product that rivals that of real cameras, but it's small enough to be used in a camera phone," said Fas Mosleh, manager of CMOS market work for Kodak's professional and applied imaging group.

There have been nice cameras in high-end mobile phones such as Nokia's N95, but Kodak believes its technology, built into a 5-megapixel sensor product to ship by the end of the year, will help bring better cameras to mainstream mobile phones.

Semiconductor chips currently detect light essentially by counting how many electrons result from light striking a pixel on the image sensor. More intense light means more electrons, and that electronic signal can be converted into digital data.

But Kodak believes it can get some improvements by rewiring the image sensor design to detect the absence of electrons instead--in effect counting "holes" rather than electrons. To do so, some sensor circuitry must be rewired, but Kodak argues that the technology produces less noise than conventional sensors.

The upshot, as promised by Kodak: better picture quality, or the same picture quality when shooting in dim light conditions such as those that prevail in most indoor scenes.

A basic problem with image sensors is the challenge of distinguishing the light's signal--the actual photons striking the sensor--from electronic noise within the sensor. That problem gets worse as pixels get smaller, so more megapixels isn't necessarily progress.

"Image quality has been deteriorating because your image resolution has been going up. Pixelization is better, but your low-light performance is worse," Mosleh said. "If you pick up a camera phone from 2003 or 2004 and compare to one from 2008, that old one will produce nicer pictures."

For product purposes, Kodak is pairing the hole-detector technology with a new color filter array Kodak calls Clear Pixel that's designed to improve low-light performance even more by devoting some pixels to measuring just brightness instead of color.

The 5-megapixel technology package, called the KAC05020, will fit into a small package measuring about .25 inch square and costing between $3 and $6 in large quantities, depending on what associated technology and software is included, Kodak said. It will support capture of 720p high-definition video, too.

Kodak researchers are presenting the sensor technology at the International Solid-State Circuits Conference on Monday in San Francisco.

The hole-detector pMOS technology could apply to larger sensors, but its benefits are clearer on small sensors, Mosleh said.

Kodak will offer KAC05020 samples in the second quarter, with high-volume shipments in the fourth quarter, the company said.

The hole detection, called pMOS in contrast to the usual NMOS sensors, can be built with no changes to semiconductor manufacturing, Mosleh said. However, some changes are necessary. "Pixel designers who have been working with collecting electrons now are collecting the absence. And the circuits coming off the sensor need to be repositioned, so support electronics need to be changed," he said.

Kodak's Clear Pixel technology, a variation on the Bayer pattern color filter array the company invented decades ago and now almost universal in digital cameras, is designed to improve sensitivity by devoting more pixels to detecting light intensity rather than color.

(Credit: Kodak)

[SnidleyWhiplash]

Already got a 5 megapixel camera phone...

The SonyEricsson K850... works great. It's nice that Kodak is trying to bring itself into the 21st century, but they're the case study for "day late, dollar short".

[GuardBoy98]

re: Sony Ericsson K850

it's hard to tell, but it looks like your K850 is rather large and pretty expensive. The beef of this story is that this new camera could replace those found in much smaller and cheaper phones. Your average camera phone sports a 1.3 megapixel camera. 2.0 mp camera phones are out there, but typically are outperformed by 1.3 mp cameras.

[eeee]

buffoon K850?

Lame comment Snidley!
The article mentions that this is new low cost high res technology
Your SonyEric K850 costs $450-500 depending where is is sold and how much the user is willing to be extorted for holding it in his hand.
Most people will not pay much if anything for a cam phone that croaks after a year of use and shoving into pockets and dropping it all over no matter how expensive it first was....

[eeee]

Thanks Kodak ! I see this changing everything

With this it seems that camera phones will truly be worthy of being used as quality cameras instead of the horrible images most produce now. Most people WILL NOT spend hundreds for a camera phone when literally dozens of different models are being given away for nothing or $30 with new service or as yearly phone "upgrades".
Thanks Kodak !