Image Sensor with Pixel-by-Pixel Exposure on Horizon

Written by Cliff Roth July 07, 2010 Hits: 580 Favorites

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The limitations of the dynamic range of image sensors has for years created problems in certain applications, particularly security and surveillance, because the exposure that produces a good image for one part of the picture -- such as a part illuminated by bright sunlight -- will then produce an image that’s too dark elsewhere, such as where there’s no sunlight.

The ultimate solution -- something photographers have dreamed of since the earliest days of “dodging” and “burning in” (techniques to selectively underexpose or overexpose particular sections of a photographic print) -- appears to be near: An image sensor that can vary exposure for each pixel.

An announcement sent recently by Forza Silicon Corporation said the company is in a joint development effort with a leading image sensor foundry to bring to market what they say is the next generation of high dynamic range CMOS image sensors.

Forza Silicon Corporation Chief Technology Officer, Daniel Van Blerkom, PhD, and his associates recently released an article evaluating the pros and cons of various high dynamic range approaches for CMOS image sensors. The article appeared in the June 1, 2010 edition of Laser Focus World.

“These [currently used] techniques all require extensive modifications to the traditional pixel design that can lead to degradations in sensitivity and dark-current performance. Modulating the integration time instead of the conversion gain can reduce the pixel modifications required” said Dr. Van Blerkom. “The next generation of HDR image sensors will require customization and optimization of the pixel, analog signal chain, and the image processing algorithms. We are happy to announce our co-operation with our foundry partner to develop this sensor IP.”

Forza demonstrated an image-aware tone-mapped image set in its labs in Pasadena, California, which they say represents a close approximation of how a natural scene looks to the human eye.

Forza is a privately held fabless semiconductor company, specializing in high-resolution, high-speed CMOS image sensors, high-speed communication chips, high resolution data converters and high speed serial interface custom IP blocks. More information can be found at www.forzasilicon.com.

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Written by :

Cliff Roth