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Optical Device for Enhancing Resolution of an Image

IP.com Disclosure Number: IPCOM000240543D
Publication Date: 2015-Feb-07

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention relates to an optical device for enhancing the resolution of an image, comprising: a transparent plate member configured for refracting a light beam passing through the plate member, which light beam projects an image comprised of rows and columns of pixels, a carrier to which said transparent plate member is rigidly mounted, wherein the carrier is configured to be tilted between a first and a second position about a first axis (A), such that the plate member is tilted between the first and the second position about the first axis (A), whereby said projected image is shifted by a fraction (ΔP) of a pixel, particularly by a half of a pixel, along a first direction (x), and an actuator means that is configured to tilt the carrier and therewith the plate member between the first and the second position about the first axis (A). According to the invention, said actuator means is formed as a reluctance actuator means that is designed to exert a reluctance force on the carrier to tilt the carrier and therewith the plate member between the first and the second position about the first axis (A).

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Specification

   The present invention relates to an optical device for enhancing resolution of an 5
image according to claim 1.

    Such an optical device usually comprises a transparent plate member (e.g. glass window) configured for refracting a light beam passing through the plate member, which light beam projects an image comprised of rows and columns of pixels, as well as a carrier to which said transparent plate member is rigidly mounted, wherein the 10
carrier is configured to be tilted between a first and a second position about a first axis, such that the plate member is tilted back and forth between the first and the second position about the first axis, whereby said projected image is shifted by a fraction of a pixel (usually by a half of a pixel) along a first direction. The device further comprises an actuator means that is configured to tilt the carrier and therewith 15
the plate member between the first and the second position about said first axis. Optical devices of this kind are for instance disclosed in US7,279,812 as well as in US5,402,184.

    The afore-mentioned enhancement of an image by overlapping of pixels is also known as super resolution projection or imaging. Here, e.g. a temporal sequence of 20
frames is split into two sub-frames, wherein to successive sub-frames may be displaced with respect to each other by a fraction of a pixel (e.g. one-half or one- third). The sub-frames are projected in a sufficiently fast manner so that they appear to the human eye as if they are being projected simultaneously and superimposed. For instance, in case the sub-frames are aligned such that the corners of the pixels in 25
one sub-frame are projected on the centers of the next sub-frame and so on, the illusion of a resolution can be achieved that seems twice as high. These kind of pixel shifting can be performed in one dimension (e.g. shifting in x-direction), but may also be performed in two dimensions (2D), e.g. shifting in x- as well as in y-direction of the image (i.e. shifting along the rows and columns of the digital image).

Based on the above the problem underlying the invention is to provide for an improved optical device for generating such a super resolution image which

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Optical Device for Enhancing Resolution of an Image

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consumes only a small installation space and provides an effective and reliable actuation of the refracting plate member (e.g. glass plate)

   This problem is solved by an optical device having the features of claim 1. According thereto, said actuator means is formed as a reluctance actuator means that is designed to exert a reluctance force on the carrier to tilt the carrier and therewith the 5
plate member between the first and the second position about the first axis.

For refracting the light beam, the plate member may have a refractive index of about n=1.5 as an example. Other suitable values may also be used.

Particular embodiments of the present invention are sta...