Photoneo, S.r.o.

Other

Massachusetts Institute of Technology

Zebra Technologies Slovakia S.r.o.

Jan Zizka

Tomas Kovacovsky

Michal Maly

Ramesh Raskar

Vitor Pamplona

Erick Passos

The effect of ambient light on a measurement taken by an imaging pixel may be reduced by employing two optical filters. The two filters may have narrow passbands that are close to each other but do not overlap. The first filter may allow ambient and active light to pass. The second filter may allow ambient light to pass but may block active light. The ambient and active light that passes through the first filter may cause electrical charge to be generated in a photodiode of the pixel. The ambient light that passes through the second filter and strikes another pixel element may control the amperage of an electrical current that depletes charge from the photodiode. For instance, the other element may be a photoresistor, the light-dependent resistance of which controls the amperage, or may be a second photodiode that generates charge that controls a transistor that controls the amperage.

Methods and apparatus for ambient light suppression with subtractive image sensor

In illustrative implementations, a set of separate modulation signals simultaneously modulates a plurality of pixels in a superpixel by a set of separate modulation signals, such that each pixel in the superpixel is modulated by a modulation signal that causes sensitivity of the pixel to vary over time. Each superpixel comprises multiple pixels. In some implementations, the sensitivity of a pixel to incident light is controlled by storage modulation or by light modulation. In some implementations, this invention is used for 3D scanning, i.e., for detection of the 3D position of points in a scene.

Methods and apparatus for superpixel modulation

An imaging system with a light source controls the sensitivity of pixels to light, by performing both superpixel modulation and curtain modulation. The superpixel modulation may facilitate rapid data acquisition. The curtain modulation may suppress the effect of ambient light. In superpixel modulation, each pixel set may be modulated by a separate superpixel modulation signal that causes sensitivity of the pixel set to light to vary over time, and each superpixel may include a pixel from each pixel set. The curtain modulation may cause pixels in only a small region of the photodetector to be sensitive to light. The curtain modulation may cause the small region to move to track the dot of light, by changing which pixels are in the region. This invention may be used for 3D scanning.

Methods and apparatus for superpixel modulation with ambient light suppression

In exemplary implementations of this invention, cataracts in the human eye are assessed and mapped by measuring the perceptual impact of forward scattering on the foveal region. The same method can be used to measure scattering/blocking media inside lenses of a camera. Close-range anisotropic displays create collimated beams of light to scan through sub-apertures, scattering light as it strikes a cataract. User feedback is accepted and analyzed, to generate maps for opacity, attenuation, contrast and sub-aperture point-spread functions (PSFs). Optionally, the PSF data is used to reconstruct the individual's cataract-affected view.

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Bratislava, Slovakia

Jan Zizka