Indian American builds camera that captures micron-resolution detail from a distance



Details from a fingerprint image taken from a distance of 1 meter by the SAVI prototype developed at Rice and Northwestern universities and led by Ashok Veeraraghavan.

NEW YORK (Diya TV) — Indian American engineer by Ashok Veeraraghavan has developed a camera prototype that can capture a detailed micron-resolution image from a distance and does that without using a long lens.

Built and tested by a team of Rice and Northwestern University engineers, it employs laser and techniques borrowed from holography, microscopy and “Matrix”-style bullet time. It reads a spot illuminated by a laser and captures the “speckle” pattern with a camera sensor.

Referred to as “Synthetic Apertures for long-range, subdiffraction-limited Visible Imaging,” or, SAVI, it only works with coherent illumination sources, such as lasers. “Today, the technology can be applied only to coherent (laser) light,” said Ashok Veeraraghavan, a Rice University assistant professor of electrical and computer engineering, in a statement.

“That means you cannot apply these techniques to take pictures outdoors and improve resolution for sunlit images — as yet. Our hope is that one day, maybe a decade from now, we will have that ability,” he said.

SAVI’s “synthetic aperture” avoids long-range photography complications by replacing a long lens with a computer program that resolves the speckle data into an image.

“You can capture interference patterns from a fair distance. How far depends on how strong the laser is and how far away you can illuminate,” Veeraraghavan said.

When a laser illuminates a rough surface, the viewer sees grain-like speckles in the dot. That’s because some of the returning light scattered from points on the surface has farther to go and throws the collective wave out of phase.

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