Patents Assigned to Dunn Instruments, Inc.
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Patent number: 4769715Abstract: Method and apparatus for generating photographic copies from a CRT display of digital pixel data. The digital pixel data is received from a host digitizing device as a series of lines to be displayed. The series of lines comprises a complete frame of image data. The digital data is used to time modulate a constant intensity CRT beam to accurately control the exposure of a photographic film. Control over the exposure is effected by scanning each line of the image frame a plurality of times. The number of times each pixel data is displayed with a constant intensity determines the total exposure produced by each pixel on the photographic film. By scanning individual lines of a rasterized picture a plurality of times, accurate control over the exposure of the photographic film may be controlled using the constant beam intensity.Type: GrantFiled: December 1, 1986Date of Patent: September 6, 1988Assignee: LogE/Dunn Instruments, Inc.Inventors: Samuel Feldman, David Haddick
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Patent number: 4679087Abstract: Apparatus and method for controlling a video signal amplitude excursion to provide a display image within a photographic acceptance range of a film. A clamping level is established for said video signal which maintains the brightness of the display monitor fixed. A gain controlled amplifier is serially connected to receive said video signal. The gain of the amplifier is set to control the contrast level for the monitor. Calibration means are provided to establish a light output from the display monitor within the optimum photographic acceptance range.Type: GrantFiled: March 12, 1984Date of Patent: July 7, 1987Assignee: LogE/Dunn Instruments, Inc.Inventors: Michael A. Torrano, Jr., George E. Lyon, David H. Haddick
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Patent number: 4530011Abstract: Apparatus and method are provided for controlling the brightness and brightness range of a CRT produced image. The resolution of photographs of the CRT-formed images is improved by establishing the absolute brightness and brightness range of the image to be reproduced within the brightness acceptance range of the photographic material used to record the images. Light sensing and measurement of the CRT image permits the establishment of a suitable image brightness and brightness range when representative samples of the video signal are supplied to the monitor CRT of the camera.Type: GrantFiled: November 26, 1982Date of Patent: July 16, 1985Assignee: LogE/Dunn Instruments, Inc.Inventor: David H. Haddick
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Patent number: 4433345Abstract: Video image recording device for photographically recording video images selected from video input signals on sheets of film, provided with means for reducing or completely eliminating recorded image drift. Recorded image parameter controls are provided which are calibrated in terms of Dunn Density Index numbers, which are related to the densities of the recorded video images. Image polarity inversion control means are provided for the recorded image and for each individual video input signal channel.Type: GrantFiled: June 19, 1981Date of Patent: February 21, 1984Assignee: LogE/Dunn Instruments, Inc.Inventors: David H. Haddick, George E. Lyon, David A. Menzimer
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Patent number: 4240729Abstract: Apparatus for receiving video output from a patient scanning device and photographing a plurality of video displays sequentially in multiple images onto a sheet of x-ray film. A video monitor adapted for connection to a scanning device, such as a gamma ray or ultrasonic imaging system, and having a display tube mounted in a housing in spaced relation to a wide angle lens formed to project the image of the face of the display tube onto a sheet of film supported in a film holder mounted on the housing. The positioning of the image on the film is determined by the vertical and lateral positioning of the lens relative to perpendicular X and Y axes corresponding to the length and width of the film. The lens is provided with a shutter for controlling the passage of light therethrough, and a pair of reversing electric motors are provided for selectively positioning the lens along the X and Y axes.Type: GrantFiled: February 14, 1977Date of Patent: December 23, 1980Assignee: Dunn Instruments, Inc.Inventor: Howard H. Barney
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Patent number: 4201223Abstract: Apparatus for synthesizing motion pictures of a cyclically functioning internal body organ such as a human heart from the monitor control (X, Y, and Z) signals provided by a scintillation camera excited by radiation from a bolus of radiopharmaceutical material transiting or standing in the organ. The individual frames of the synthesized motion picture are recorded on a disc of photographic film which is rotated step-by-step by a digital rate-and-position servodrive. The picture quality of each frame is enhanced by repeatedly exposing it to the monitor screen image during substantially the same phase of successive functioning cycles of the organ. The organ cycle phase signals which serve as step commands for the servodrive are generated by a synchronizing circuit which is itself synchronized to the cyclic rate of the body organ being examined by means of bioelectrical signals derived from the patient being examined.Type: GrantFiled: June 20, 1977Date of Patent: May 6, 1980Assignee: Dunn Instruments, Inc.Inventor: Howard H. Barney
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Patent number: 4027315Abstract: Apparatus for receiving video output from a patient scanning device and photographing a plurality of video displays sequentially in multiple images onto a sheet of x-ray film. A video monitor adapted for connection to a scanning device, such as a gamma ray or ultrasonic imaging system, and having a display tube mounted in a housing in spaced relation to a wide angle lens formed to project the image of the face of the display tube onto a sheet of film supported in a film holder mounted on the housing. The positioning of the image on the film is determined by the vertical and lateral positioning of the lens relative to perpendicular X and Y axes corresponding to the length and width of the film. The lens is provided with a shutter for controlling the passage of light therethrough, and a pair of reversing electric motors are provided for selectively positioning the lens along the X and Y axes.Type: GrantFiled: October 3, 1975Date of Patent: May 31, 1977Assignee: Dunn Instruments, Inc.Inventor: Howard Hunter Barney