摘要:
A technique generates a pyramid of image tiles to represent a source image at different resolutions. A base image tile stores, in a plurality of elements, an “on” state or an “off” state to represent the source image at a first resolution. Additional image tiles, with image resolutions lower than the resolution of the base image tile, are generated. The base image tile is divided into groupings of elements, such that each level of the pyramid of image tiles is generated by mapping a grouping of elements from the base image tile to an image tile at different levels of the pyramid. A threshold density of elements in the grouping elements is selected. If the grouping of elements in the base image tile for a level has a threshold density of “on” elements, the image data for the element in the current level is set to an “on” state. Conversely, the image data for the element is set to an “off” state if the threshold density of “on” elements in the base image tile grouping is less than the threshold density.
摘要:
A graphics system readily activates and deactivates layers of a multi-layer source image. Image data, such as a multi-layered integrated circuit (“IC”) design, is generated for a multi-layer source image. A pyramid of image tiles defines “on” and “off” states for elements that represent the source image. A bit plane identifies values for the elements for each layer of the source image. Mask image data is generated to zero image data associated with at least one layer of the bit plane. The graphics system generates pixel data from the mask image data, and renders the pixel data on an output display.
摘要:
A haptic computer output device comprises a data glove 10 the finger and thumb extension 10A and 10B of which have spaced ring formations 13 and 14. Each ring formation 13 and 13 is formed with an inwardly-opening blind bore 21 spanned in gas-tight manner by a membrane 23 and conduits 20 within the ring formations selectively apply pressurised air to or relieve it from the bores 21 under the control of a valve assembly 34 in turn controlled by a computer 30. The computer generates images perceived on a visual system 32 by a wearer of the glove. Data concerning the spatial position and flexing of the glove 10 is transmitted via line 31 to the computer, which additionally generates a cursor on the visual system 32. When this interacts with other virtual objects to simulate a "touch" the appropriate bore 21 is inflated via valve assembly 34 to apply a tactile stimulus to the wearer of the glove.
摘要:
An apparatus for testing failure of a material used in a jet engine, and more particularly to an apparatus that uses one or more model jet engine components made from a material used in a full-size jet engine and desired to be tested. The apparatus permits easy removal and disassembly of a jet engine mounted thereon as well as real-time measurements of run-time parameters. The methods and apparatus provide for predicting and analysing failure by a number of fatigue-related mechanisms including creep, fatigue, crack growth, foreign object damage, fretting, erosion, and stress corrosion.
摘要:
An optical system comprising three lenses concentrically housed in a frame is aligned with a screen on which a televisual image of a virtual reality application is displayed. The compact and high power lenses permit the eye of a viewer when placed at eye position to have a wide field of view of the magnified virtual image of the screen. To train the eye of the user along the optical axis of the system the lenses vignette the image on the screen when the eye is not closely aligned with the axis. By plastics moulding one or more of the lenses so that they are of truncated form it is possible for injection points of the mould to be adjacent truncated side faces thereby permitting a balanced generally free flow of material through the mould cavity which results in minimal optical stresses in the finished lens.
摘要:
An apparatus for testing failure of a material used in a jet engine, and more particularly to an apparatus that uses one or more miniature jet engine components made from a material used in a full-size jet engine and desired to be tested. The apparatus permits easy removal and disassembly of a jet engine mounted thereon as well as real-time measurements of run-time parameters. The methods and apparatus provide for predicting and analyzing failure by a number of fatigue-related mechanisms including creep, fatigue, crack growth, foreign object damage, fretting, erosion, and stress corrosion. The apparatus also permits testing of a component placed in the exhaust gases of a jet engine mounted therein.