Abstract: There is disclosed a lens arrangement comprising: an input negative macro-lens array negative macro-lens aray; an output negative macro-lens aray disposed with its lenses arranged correspondingly to those of the input array, and between said input and output arrays a double convex microlens array.

Abstract: There is disclosed a method for producing a system for delivering a drug for the treatment of a condition, comprising immobilizing a drug or other agent in a bio-compatible matrix containing at least one receptor for a physiological substance which will be in the environment of the matrix when administered, said receptor being anchored within the matrix but remaining biologically active being activated in response to the levels of said physiological substance to effect a conformational change in the matrix allowing mobilization and release of the drug only into the environment.

Abstract: A method for producing a drug system which is a reversible gelled matrix with entrapped drug. The gel is made by combining a polysaccharide, such as dextran, a polymer of glucose, with a natural macromolecule, such as the lectin, concanavalin A, with binding sites for monomers of the polysaccharide. The drug is released in response to exposure of the matrix to free carbohydrate containing the monomer of the polysaccharide for which the natural macromolecule binds.

Abstract: An imaging arrangement has a first lens array with a focal surface and a tapered optical fiber bundle arranged with one end face coincident with the focal surface of the lens array. Another end of the bundle is coincident an optical device. The optical device may be a second lens array, an image capture device, a photographic plate, or an electronic image capture device such as a CCD array. The fiber bundle may comprise a single graded index fiber connecting the first and second lens arrays. An integral transmission screen may be provided to project a spatially inverted integral image onto the first lens array.

Abstract: A lens system comprising an input lens array (11), an optical transmission microlens screen (12), and an output lens array (13), in which the lenses (11a) of the input array (11) correspond along an optical axis with corresponding lenses (13a) of the output array (13).

Abstract: There is disclosed an imaging system forming a pseudoscopic image in focus throughout extended depth of field comprising an input relay lens array, a double integral microlens screen having a median plane on to which the input lens array images an object scene and, on the opposite side of the screen and the same distance therefrom as the input array, an output relay lens array similar to the input lens array.

Abstract: The invention relates to optical elements, particularly retro-reflecting, retro-imaging and optical transmission inversion elements to relay a true scale equal conjugate image of a scene. Hitherto, the image had a resolution limit set by the pitch and/or packing density of micro-optical elements to reflect or transmit ray bundles impinging on them, the number of elements within the viewing zone determining the lateral and hence depth resolution in any given direction. The object of the invention is to reduce the effect of micro-screen texture in a relatively inexpensive manner, that provides real-time systems and which can be used with fast moving objects. This objective is met by an optical element comprising a retro-reflecting or auto-collimating transmission screen (9) having one or more lenses (6,10) and an associated means (8,11) of displacing wavelengths to different degrees and whereby to spread a reflected or transmitted image into a spectral streak.

Abstract: A method and apparatus measure lengths on an article such as a garment by arranging the article in a field of view of an imaging device, e.g. a video camera forming a pixel image in an x-y array, identifying measurement points on the pixel image in terms of x and y coordinates of the array and evaluating actual lengths between identified measurement points by carrying out for example in a computer appropriate Pythagorean calculations based on the the coordinates and modified to correct for scale and system distortions. Measurement points can be identified by marking the article. The method and apparatus are of use for example in the measurement of shrinkage.

Abstract: A method for inspecting garments for holes includes front-lighting the garment against a contrasting background and forming a pixel image thereof, isolating garment pixels from background pixels by automatically selecting an optimum binarization threshold grey level, binarizing the image at that level, determining the garment boundary, testing for consistency of grey level within the garment boundary on the binarized image along rows and columns of pixels within the garment boundary and noting inconsistent pixels, and identifying as holes only pixels which have been noted as inconsistent in both horizontal and vertical tests.