Showing papers on "Image file formats published in 1980"

Extracting oblique planes from serial CT sections.

Abstract: Although geometric principles describing planes oblique to an orthogonal image data set are well understood, no implementation has been offered for their practical specification, extraction, and display in a clinical environment. Fast image generation and ease of user specification-requisite credentials for successful clinical implementations-are handicapped by the large volume of data to process. Other difficulties further complicate an interactive solution. Once oblique planes are generated, their orientation is often difficult to perceive without visual cues that aid their registration with standard image formats. In addition, Moire patterns introduced by digital aliasing often currupt resultant views. In this paper, techniques are outlined for simplifying oblique plane specification, a methodology is presented for image construction, and an interactive approach is illustrated to register images for such general view planes. Finally, digital aliasing of oblique planes is discussed, and a solution is given for this application.

Human Performance Evaluation of Graphic and Textual CRT Displays of Diagnostic Data

Abstract: A study was conducted to determine the effectiveness of four alternative CRT display formats for diagnostic data. The formats were narrative text, structured text, black and white graphics, and color graphics. The evaluation measured subjects' speed and accuracy of response to a question requiring interpretation of a display. The results indicated that accuracy of response did not vary with format. Speed of response, however, did vary with format. Responses to both graphic formats were consistently faster than to the narrative text format. With additional practice, responses to the structured text format were just as fast as to the graphic formats. Language: en

Large-Format Precision Laser Film Recorder

Abstract: A line of large-format raster-type film recorders, utilizing argon ion laser and rotating-drum techniques, is described. Image formats of up to 40X72 inches are available. The recorders are characterized by high absolute accuracy (down to 20 microns) high incremental accuracy (2.5 microns), continuously variable line-spacing and fairly high speed (up to 1 million points per second). Input is coded digital data from any source. Although developed for graphic arts applications, as part of a series of digital color image processing systems, these recorders can be readily adapted to other applications, including many that now use X-Y film plotters. One present version of the recorder enables exposing most common lithographic films with binary ("line") images as well as with half-tone images of any mesh number and angle. This version is already being applied to decorative, as well as to publications, printing preparation, to computer-aided cartography, and to seismographic and remotely sensed (aerial and satellite) data recording. Another version enables recording of variable density (continuous-tone) films. Future plans include adaptation to the expo-sure of offset plates, further increase in accuracy, and a five-fold increase in speed.