3M

About: 3M is a company organization based out in Saint Paul, Minnesota, United States. It is known for research contribution in the topics: Layer (electronics) & Coating. The organization has 7603 authors who have published 7907 publications receiving 254227 citations. The organization is also known as: Minnesota Mining and Manufacturing Company & 3M Company.

Method and system for enhancement of a digitized image

Abstract: A system and method of modifying pixels supplied to the system that a multiple level signals for a digitized image wherein a moving pixel window (16) with a center pixel, D c , is used from which the annular means, m a , of the center pixel (the mean of the 2 N pixel values of the window surrounding the center pixel, where N is an integer of 1 or more) is determined with the center pixel and selected pixels surrounding the center pixel, D c , are used to establish a modification gain, g, or determine a measure of deviation (center deviation, σ c ) of the center pixel relative to the center pixel that is used to obtain a modification gain, f(σ c ,C g ) of f,(σ,C g ). The center pixel, D c , its annular mean, m a , and its modification gain, g, f(σ c ,C g ) or f′(σ c ,C g ) are used to obtain a modified center pixel value, D c ′, in accordance with one of the following equations that are of the form for an algorithm for determining the unsharp masking filter value for an image pixel: D c ′ = [g x (D c - m a )] = m a ; or D c ′ = f(σ c ,C g ) x (D c - m a )] + m a ; or where n is an integer of 0 or greater.

Cube-corner retroreflective articles

Abstract: PURPOSE: To obtain a retroreflective article which accelerates retroreflection and has high daytime lightness by including a sheet having a retroreflection region having many cube corner elements and opaque pigment particles having the lightness improving property dispersed in the retroreflection region of the sheet. CONSTITUTION: Thus retroreflective article 30 is provided with a cube corner sheet 32 having the retroreflection region 33 in its front part 35. The front part 35 consists of body parts 34 and the many cube corner elements 36 projecting from the body parts 34. The opaque pigment particles 38 having the lightness improving property are dispersed over the entire part of the cube corner sheet 32. The cube corner sheet 32 may be provided with a covering film 40 to protect the cube corners against UV rays and corrosion. The rear surfaces of the cube corner elements 36 are so formed as to have a boundary with a reflection material, such as metal, or a material having the refractive index different from the refractive index of the polymer material of the cube corner elements 35, for example, air, in order to accelerate the retroreflection.

Multi-panel electroluminescent light assembly

Abstract: A multi-panel electroluminescent panel assembly is provided in which an area extending over several panels may be uniformly illuminated by light produced by the panels, and over which non-illuminated areas, stripes or the like resulting from electrode contacts are eliminated. Each panel is constructed such that the light produced per unit area is substantially uniform throughout the panel, including that from an area immediately adjacent at least one edge thereof. The panels are assembled in an overlapping arrangement such that non-illuminating areas of one panel are covered by illuminating areas of at least one other panel. The assembly of panels provides a large area source of uniform illumination suitable for back-lighting graphic indicia, and may be desirably included as signboards on the sides of motor vehicles such as transport trucks, buses, etc.

Color calibration for LCD panel

Abstract: A presentation system uses a computer to store and transmit electronic images to a liquid crystal display (LCD) panel which rests on an overhead projector. The LCD panel includes a calibration circuit designed to correct discrepancies in the saturation levels of the three primary colors. The calibration circuit determines the digital values in a signal corresponding to a test pattern of maximum intensity for all three colors, and compares these values to predetermined theoretical values. The differences between these values are recorded as calibration constants and are used to correct the image signals transmitted from the computer. A remote control unit may be used to provide a stimulus to both the computer (to generate the test pattern) and the LCD panel (to execute the calibration process).

Repositionable articles having a microstructured surface, kits for producing same, and methods of use

Abstract: A repositionable article having a microstructured surface is described which includes a removable and rebondable adhesive layer having first and second surfaces and a control layer having a control surface and a back surface, the second surface of the adhesive layer adhered to the back surface of the control layer, the control surface defined by an array of a plurality of precisely shaped raised regions and a plurality of recessed regions. The articles find use particularly as mouse pads.