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  • Other Sources  (269)
  • INSTRUMENTATION AND PHOTOGRAPHY  (269)
  • 1990-1994
  • 1985-1989  (269)
  • 1988  (269)
  • 1
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    Automatic line generalization using zero-crossings (1988)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The problem of automating the process of line generalization has been very difficult. It has not been solved yet despite the concerted effort of many private firms as well as government agencies. There does not exist an algorithm which can automatically perform this process when there is a drastic change in scale between the original and generalized maps. In this paper, an algorithm which is successful in automatically generalizing lines from any large scale to any small scale is presented. The algorthm achieves different levels of smoothing the line while preserving the overall shape of the line. The results are compared with those obtained by manual methods. It was found that the results obtained by the algorithm are very close to those obtained by cartographers using manual methods.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Photogrammetric Engineering and Remote Sensing (ISSN 0099-1112); 54; 511-517
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  • 2
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    Response function of a tunable diode laser spectrometer from an iterative deconvolution procedure (1988)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A deconvolution procedure commonly used for resolution enhancement of spectra has been applied to the determination of the response function of a tunable diode laser spectrometer. The method is sufficiently fast and simple for routine application when correcting for nonnegligible instrumental broadening. Absolute linestrengths of CH4 in the 1327/cm region and line positions of HNO3 in the 1335/cm region, measured with the aid of the deconvolution technique, are reported here.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Journal of Quantitative Spectroscopy and Radiative Transfer (ISSN 0022-4073); 39; 247-253
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    NASA TECHNICAL REPORTS
  • 3
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    Radiometric calibrations of portable sources in the vacuum ultraviolet (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The primary UV radiometric calibration standards of the Atomic and Plasma Radiation Division of the NBS are the hydrogen arc and the blackbody line arc. The secondary standards are the argon mini- and maxiarcs, and the deuterium arc lamp. Calibration methods involving both spectral radiance and irradiance, as well as the evaluation of their uncertainties, are discussed. Attention is given to the establishment of an irradiance scale, and the absolute spectral irradiance, measured as a function of wavelength, at a 50-cm distance from the field aperture for five different continuum sources.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Journal of Research (ISSN 0160-1741); 93; 21-39
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  • 4
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    Wiener restoration of sampled image data - End-to-end analysis (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The Wiener filter is formulated as a function of the basic image-gathering and image-reconstruction constraints, thereby providing a method for minimizing the mean-squared error between the (continuous-input) radiance field and its restored (continuous-output) representation. This formulation of the Wiener filter is further extended to the Wiener-characteristic filter, which provides a method for explicitly specifying the desired representation. Two specific examples of Wiener filters are presented.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Optical Society of America, Journal, A: Optics and Image Science (ISSN 0740-3232); 5; 300-314
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  • 5
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    Image-gathering system design for information and fidelity (1988)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Image gathering and processing are assessed in terms of information and fidelity, and the relationship between these two figures of merit is examined. It is assumed that the system is linear and isoplanatic and that the signal and noise amplitudes are Gaussian, wide-sense stationary, and statistically independent. Within these constraints, it is found that the combined process of image gathering and reconstruction (which is intended to reproduce the output of the image-gathering system) behaves as optical, or photographic, image formation in that the informationally optimized design of the image-gathering system ordinarily does not maximize the fidelity of the reconstructed image. The combined process of image gathering and restoration (which is intended to reproduce the input of the image-gathering system) behaves more as a communication channel in that the informationally optimized design of the image-gathering system tends to maximize the fidelity of optimally restored representations of the input.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Optical Society of America, Journal, A: Optics and Image Science (ISSN 0740-3232); 5; 285-299
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  • 6
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    AIS radiometry and the problem of contamination from mixed spectral orders (1988)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The spectral radiance of test areas under solar illumination is ascertained in view of Airborne Imaging Spectrometer (AIS) data from Mono Lake, CA, establishing an atmospheric correction method for major absorbers on the basis of the spectrometric data themselves. The apparent low contrast of all atmospheric absorption bands leads to a study of contamination from overlapping spectral orders in the AIS data; this contamination is found unambiguously above 1500 nm with a magnitude that is a factor of 1.5-2.0 greater than the expected uncontaminated signal alone.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Remote Sensing of Environment (ISSN 0034-4257); 24; 179-200
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  • 7
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    Measurement of Seebeck coefficient using a large thermal gradient (1988)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The integral method of measuring the Seebeck voltage, V(T), has been applied to short rod-shaped samples. In the present method, one end of the sample is held at a fixed temperature and the other end is automatically varied through a temperature T range of interest, up to a maximum temperature of 1000 C. The Seebeck coefficient is then obtained from the slope of the V(T) vs T curve. The method offers simplicity of sample handling and minimal operator involvement.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments (ISSN 0034-6748); 59; 951-954
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  • 8
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    Optical pseudocolor image enhancement with real-time large screen display (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A real-time broadband pseudocolor image enhancement technique using a liquid crystal television spatial light modulator (LCTV SLM) is described. Three different schemes to modulate the gray-scale disribution of an input scene by an LCTV SLM through varying the orientations of its analyzer are presented. These schemes are incorporated into a compact white light optical projection system that is able to display, on a large screen, broadband pseudocolor images of real-world input scenes. Experimental results demonstrating the feasibility of the technique are reported.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Optical Engineering (ISSN 0091-3286); 27; 393-398
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  • 9
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    Image processing software for imaging spectrometry data analysis (1988)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Imaging spectrometers simultaneously collect image data in hundreds of spectral channels, from the near-UV to the IR, and can thereby provide direct surface materials identification by means resembling laboratory reflectance spectroscopy. Attention is presently given to a software system, the Spectral Analysis Manager (SPAM) for the analysis of imaging spectrometer data. SPAM requires only modest computational resources and is composed of one main routine and a set of subroutine libraries. Additions and modifications are relatively easy, and special-purpose algorithms have been incorporated that are tailored to geological applications.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Remote Sensing of Environment (ISSN 0034-4257); 24; 201-210
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  • 10
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    Highly automated transmission-edge mapping (1988)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Instrumentation and software are described, which are used to determine maps of properties of materials based on optical transmission spectra. In addition to a Fourier transform spectrometer, the hardware includes an xy-stage containing a small stationary aperture and two computer controlled stepper motors for positioning the sample. This idea has been used for years but this implementation is highly automated compared to those previously described. All mapping has been in the 2-15 micron wavelength range but this is not an inherent limitation of the technique. In this spectral range, useful results may be obtained with apertures as small as 25 microns in diameter. The software is described including the algorithm for obtaining the cut-on wavelength from a semiconductor spectrum. Data from both transverse slices and longitudinal slabs of narrow bandgap alloy semiconductors are shown including composition maps for materials solidified with convex and concave growth interfaces.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Journal of Crystal Growth (ISSN 0022-0248); 86; 1-4,; 650-655
    Format: text
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