Abstract:
An apparatus for providing electronic exposure control, and a method of operating the same, that contains no moving parts is disclosed. The disclosed apparatus and method are based on the recognition that an electronic imaging device (14), such as a CCD imager, can be operated in a manner to provide both shuttering and aperture control functions. An exposure control unit (24) is provided that varies the gain of a variable gain amplifier (18) coupled to an electronic imaging device (14) in response to measured scene light.
Abstract:
A method and apparatus for performing error correction is disclosed in which an optimum error correction algorithm to be applied to a digital data signal is selected based on a detected characteristic of the digital data signal. The selection of an optimum error correction algorithm based on a characteristic of the digital data signal insures maximum efficiency of the error correction process with a minimum impact on overall system throughput efficiency.
Abstract:
The present invention is a system which compares the print job requirements to the printer capability and determines the best match therebetween. When a mismatch occurs, the system determines the best match between size, color, weight and type by determining a mismatch magnitude between the job paper requirements and the printer's paper capabilities or stocks. The paper with the lowest mismatch magnitude is designated. The system also determines the best match between the job requirements and the printer capability for stapling, folding, duplexing and stacking. The operator is given an opportunity to correct any mismatches and the best match is used to configure the printer for the job if the user has specified a best match print strategy.
Abstract:
A radiographic laser printer (14) has high speed memory (16) for storing digital images. The high speed memory (16) includes an array of magnetic or optical disk storage devices which are accessed in parallel from a digital data bus (12). The use of external FIFO memory is eliminated by transferring data from the data bus in interleaved format directly into buffer memories located in the disk storage devices (16).
Abstract:
A color photographic silver halide negative working duplicating element comprising a support having thereon at least one red-sensitive photographic silver halide emulsion layer comprising at least one cyan image-dye forming coupler; at least one green-sensitive photographic silver halide emulsion layer comprising at least one magenta image-dye forming coupler; and, at least one blue-sensitive photographic silver halide emulsion layer comprising at least one yellow image-dye forming coupler, provides improved images when (a) at least one of the layers comprises a unit of at least two layers including a first layer and a second layer, the first layer having a higher photosensitivity than the second layers and being farther from the support than the second layers; (b) the firt layers contain an image-dye forming coupler in an amount insufficient to react with all the oxidized developer formed during development after maximum exposure; (c) the image-dye forming couplers of the first layers being in a dispersion having a mean particle size of less than 0.14 micron; and, (d) the silver halide grains of the first layers having a mean grain volume less than 0.015 cubic micron. Such a photographic element is especially useful in motion picture film duplication providing reduction in granularity of the image.
Abstract:
Disclosed are polymer compositions having improved impact strength, comprising copolyesters of terephthalic acid, ethylene glycol and 1,4-cyclohexanedimethanol with epoxy functional polyolefins.
Abstract:
Disclosed is a continuous process for the preparation of acetic anhydride which comprises carbonylating a mixture comprising (i) methyl iodide and (ii) methyl acetate and/or dimethyl ether in the presence of a rhodium catalyst and a promoter wherein the concentration of mesityl oxide in the carbonylation mixture is suppressed by the presence therein of at least 100 ppm of dissolved ferrous and/or cobaltous ion.
Abstract:
In curtain coating, uniform layer or layers are only obtained if the operational variables are held within precise limits. These limits define a "coating window". However, one of the boundaries of this "window" is governed by the occurrence of air-entrainment. Described herein is an improved coating process which allows the "coating window" to be enlarged. This is achieved by using a material adjacent the support onto which the liquid material is to be coated which readily shear-thins.
Abstract:
The present invention relates to implants (22, 70, 90, 170) (intraocular lenses) for implantation in the human eyeball (20) to replace the natural crystalline lens. In general, the implant (22) includes a body (50) which includes anterior (52) and posterior (54) surfaces, an axis (58), and a periphery. The body (50) is formed of a transparent material having an index of refraction which varies with a predetermined profile from the axis (58) to the periphery of the body (50). In a first embodiment, the body (50) is formed of one element having a convex-convex shape and an index of refraction which decreases in the direction away from the axis (58) of the body (50). For dual-focus capabilities, the body (71) has an inner (76) and an outer zone with separate gradient profiles and surface curvatures, or an inner zone (76) which is offset from the axis (78) and is the center of the gradient profile. The inner (76) and outer zones provide focusing for nearby and distant objects respectively. In a second embodiment, the implant (170) includes an achromatic doublet lens (172) of first (174) and second (176) contacting elements formed of a transparent material. The transparent materials of the first (174) and second (176) elements have gradient indices of refraction which decrease in opposite directions from each other between the axis (180) to the periphery of the lens. Haptics (56) extend from the periphery of each implant (22, 70, 90, 170) for engagement with appropriate portions of the eyeball (20).
Abstract:
The present invention is a high resolution charge-coupled device (CCD) camera system (10) having a CCD camera (12) which is capable of operating at a low data rate (e.g., 1 to 2.5 MHz) that is compatible with the input data rate of a computer (16). An output of the CCD camera (12) is coupled through an analog-to-digital convertor (14) (A/D) to an input of the computer (16) which receives and analyzes the output of the camera. The CCD camera (12) contains a CCD image sensor (18) which is a two-phase sensor capable of operating in an accumulation mode at room temperature so as to reduce the dark current generated in the sensor. Thus, the CCD camera system (10) is of simple construction so as to be relatively inexpensive and can operate at room temperature with reduced dark current.