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  • 1
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    An information theory of image gathering (1991)
    Elsevier
    Details
    Publication Date: 1991-09-01
    Print ISSN: 0020-0255
    Electronic ISSN: 1872-6291
    Topics: Computer Science
    Published by Elsevier
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    PAPER CURRENT
  • 2
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    Flow-injection analysis with electrochemical detection for determination of salicylic acid in pharmaceutical preparations (1993)
    Elsevier
    Details
    Publication Date: 1993-02-01
    Print ISSN: 0003-2670
    Electronic ISSN: 1873-4324
    Topics: Chemistry and Pharmacology
    Published by Elsevier
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    PAPER CURRENT
  • 3
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    Redundancy reduction in image coding (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: We assess redundancy reduction in image coding in terms of the information acquired by the image-gathering process and the amount of data required to convey this information. A clear distinction is made between the theoretically minimum rate of data transmission, as measured by the entropy of the completely decorrelated data, and the actual rate of data transmission, as measured by the entropy of the encoded (incompletely decorrelated) data. It is shown that the information efficiency of the visual communication channel depends not only on the characteristics of the radiance field and the decorrelation algorithm, as is generally perceived, but also on the design of the image-gathering device, as is commonly ignored.
    Keywords: CYBERNETICS
    Type: In: Visual information processing II; Proceedings of the Meeting, Orlando, FL, Apr. 14-16, 1993 (A93-53022 23-63); p. 102-112.
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  • 4
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    Multiresponse imaging system design for improved resolution (1991)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Multiresponse imaging is a process that acquires A images, each with a different optical response, and reassembles them into a single image with an improved resolution that can approach 1/sq rt A times the photodetector-array sampling lattice. Our goals are to optimize the performance of this process in terms of the resolution and fidelity of the restored image and to assess the amount of information required to do so. The theoretical approach is based on the extension of both image restoration and rate-distortion theories from their traditional realm of signal processing to image processing which includes image gathering and display.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ; : Problems in the ae
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    NASA TECHNICAL REPORTS
  • 5
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    Information, entropy and fidelity in visual communication (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: This paper presents an assessment of visual communication that integrates the critical limiting factors of image gathering and display with the digital processing that is used to code and restore images. The approach focuses on two mathematical criteria, information and fidelity, and on their relationships to the entropy of the encoded data and to the visual quality of the restored image.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: In: Visual information processing; Proceedings of the Meeting, Orlando, FL, Apr. 20-22, 1992 (A93-32438 12-61); p. 145-154.
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  • 6
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    Wiener-matrix image restoration beyond the sampling passband (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A finer-than-sampling-lattice resolution image can be obtained using multiresponse image gathering and Wiener-matrix restoration. The multiresponse image gathering weighs the within-passband and aliased signal components differently, allowing the Wiener-matrix restoration filter to unscramble these signal components and restore spatial frequencies beyond the sampling passband of the photodetector array. A multiresponse images can be reassembled into a single minimum mean square error image with a resolution that is sq rt A times finer than the photodetector-array sampling lattice.
    Keywords: CYBERNETICS
    Type: In: Infrared imaging systems: Design, analysis, modeling, and testing II; Proceedings of the Meeting, Orlando, FL, Apr. 3-5, 1991 (A93-38351 15-35); p. 237-248.
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  • 7
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    Multiresolution image gathering and restoration (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: In this paper we integrate multiresolution decomposition with image gathering and restoration. This integration leads to a Wiener-matrix filter that accounts for the aliasing, blurring, and noise in image gathering, together with the digital filtering and decimation in signal decomposition. Moreover, as implemented here, the Wiener-matrix filter completely suppresses the blurring and raster effects of the image-display device. We demonstrate that this filter can significantly improve the fidelity and visual quality produced by conventional image reconstruction. The extent of this improvement, in turn, depends on the design of the image-gathering device.
    Keywords: COMMUNICATIONS AND RADAR
    Type: Journal of Visual Communication and Image Representation (ISSN 1047-3203); 3; 4; p. 356-363.
    Format: text
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  • 8
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    Image gathering and digital restoration for fidelity and visual quality (1991)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The fidelity and resolution of the traditional Wiener restorations given in the prevalent digital processing literature can be significantly improved when the transformations between the continuous and discrete representations in image gathering and display are accounted for. However, the visual quality of these improved restorations also is more sensitive to the defects caused by aliasing artifacts, colored noise, and ringing near sharp edges. In this paper, these visual defects are characterized, and methods for suppressing them are presented. It is demonstrated how the visual quality of fidelity-maximized images can be improved when (1) the image-gathering system is specifically designed to enhance the performance of the image-restoration algorithm, and (2) the Wiener filter is combined with interactive Gaussian smoothing, synthetic high edge enhancement, and nonlinear tone-scale transformation. The nonlinear transformation is used primarily to enhance the spatial details that are often obscurred when the normally wide dynamic range of natural radiance fields is compressed into the relatively narrow dynamic range of film and other displays.
    Keywords: CYBERNETICS
    Type: Computer Vision, Graphics, and Image Processing: Graphical Models and Image Processing (ISSN 1049-9652); 53; 71-84
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  • 9
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    Image recovery from edge primitives (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A method for extracting edge primitives from Mach-band patterns is presented together with a method for recovering image representations of features outlined by the edge boundaries. The accuracy, stability, and resolution of these representations are assessed. Since these representations are most commonly used in characterizing targets, this method of low-level processing offers new opportunities for computer vision and high data-compressing coding. Two bandpass filters are considered, the spatially invariant Laplacian of Gaussian filter and spatially variant intensity-dependent spatial (IDS) summation. It is shown that the recovery from the IDS bandpass data is particularly advantageous in applications for which robustness to local and temporal variations in illumination is important. It is concluded that the edge primitives extracted from bandpassed images can be an efficient way to store, transmit, and represent images.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Optical Society of America, Journal, A: Optics and Image Science (ISSN 0740-3232); 7; 898-911
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  • 10
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    An information theory of image gathering (1991)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Shannon's mathematical theory of communication is extended to image gathering. Expressions are obtained for the total information that is received with a single image-gathering channel and with parallel channels. It is concluded that the aliased signal components carry information even though these components interfere with the within-passband components in conventional image gathering and restoration, thereby degrading the fidelity and visual quality of the restored image. An examination of the expression for minimum mean-square-error, or Wiener-matrix, restoration from parallel image-gathering channels reveals a method for unscrambling the within-passband and aliased signal components to restore spatial frequencies beyond the sampling passband out to the spatial frequency response cutoff of the optical aperture.
    Keywords: CYBERNETICS
    Type: Information Sciences (ISSN 0020-0255); 57-58; 245-285
    Format: text
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