Omni-Focus Camera Sees Near and Far
TORONTO, May 10, 2010 — Researchers at the University of Toronto have announced a breakthrough in video camera design dubbed the Omni-focus video camera. Based on an entirely new distance-mapping principle, the device delivers automatic real-time focus of both near- and far-field images, simultaneously, in high resolution. This unprecedented capability can be broadly applied in various industries, including manufacturing, medicine, defense and security – as well as for the consumer market.
The image shown in (a), which was acquired with a prototype using two-color video cameras, clearly demonstrates how the omnifocused output dramatically differs from that of a conventional camera (b). Note that in the omnifocused image, the fingers in the foreground are so sharply focused that even the fingerprints are easily recognized. (Images: University of Toronto)
Inventor and principal investigator of the Omni-focus video camera, Keigo Iizuka of the Edward S. Rogers Sr. Department of Electrical and Computer Engineering, explained that, “the intensity of a point source decays with the inverse square of the distance of propagation. This variation with distance has proven to be large enough to provide depth mapping with high resolution. What’s more, by using two point sources at different locations, the distance of the object can be determined without the influence of its surface texture.” This principle led Iizuka to invent a novel distance-mapping camera, the divergence-ratio axi-vision camera (divcam), which is a key component of the new Omni-focus video camera.
The Omni-focus video camera is produced in collaboration with consulting investigator David Wilkes, president of Wilkes Associates, a Canadian high-tech product development company. It contains an array of color video cameras, each focused at a different distance, and an integrated divcam. The divcam maps distance information for every pixel in the scene in real time. A software-based pixel correspondence utility, using prior intellectual property invented by Wilkes, uses the distance information to select individual pixels from the ensemble of outputs of the color video cameras, and generates the final “Omni-focused” single-video image.
Although the two sewing needles were photographed approximately 1.2 m apart, both are in sharp focus. Note that the eye of the back needle is actually viewed through the eye of the front needle.
“The Omni-focus video camera’s unique ability to achieve simultaneous focus of all of the objects in a scene, near or far, multiple or single, without the usual physical movement of the camera’s optics, represents a true advancement that is further distinguished in terms of high-resolution, distance mapping, real-time operation, simplicity, compactness, lightweight portability and a projected low manufacturing cost,” Wilkes said.
The camera is still in the research phase. But it’s not difficult to imagine how far-reaching an impact the omnifocus video camera could have on several industries. As for the future direction of his research, Iizuka sees the following possibilities:
• Application of the omnifocus video camera to television studio cameras. Consider the example of a musical concert being televised by a major network. Even though the singer is in sharp focus, band members in the background, are invariably out of focus. Conventional video cameras are unable to focus simultaneously on both the singer and band members in the background. The omnifocus video camera removes this limitation to deliver higher-quality video images and improved quality of experience to potentially millions of TV viewers, worldwide.
• Application of the omnifocus video camera to medicine. “I’d like to apply the principle of the omnifocus video camera to the design of a laparoscope. It would help doctors at the operating table, if they can see the entire view without touching optics of the laparoscope, especially if dealing with a large lesion,” Iizuka said.
For more information, visit: www.ecf.utoronto.ca
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