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  • 1
    Electronic Resource
    Electronic Resource
    Spectral estimation of video signals (1992)
    Springer
    Multidimensional systems and signal processing 3 (1992), S. 131-160 
    Details
    ISSN: 1573-0824
    Keywords: Spectral estimation ; periodogram ; FFT ; autoregressive modeling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Spectrum analyzers are ubiquitous in laboratory work concerning one dimensional signals. This is because linear operators are best examined in the frequency domain. Linear operators, such as linear filters, DCT coders, line shufflers, etc., dominate also the video systems scenario. Their frequency domain study is as appropriate and informative as it is in the case of their one-dimensional counterparts. This paper considers the problems associated with the introduction of two well-known spectral estimation techniques, the periodogram and AR estimates, to the context of television signals. The potential for application of spectral estimation to video problems is exemplified by a number of applications related to the fields of enhanced quality television and HDTV. Special attention is paid to the computational aspects, whose effective solution conditions the practical applicability of the proposed spectral estimation techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01942040
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Relations between thek-dimensional unconstrained and linear phase FIR Wiener filters (1995)
    Springer
    Multidimensional systems and signal processing 6 (1995), S. 347-350 
    Details
    ISSN: 1573-0824
    Keywords: Least squares ; optimal FIR filtering ; multidimensional Wiener filters ; linear phase filters ; multichannel systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract In this note, we show that thek-dimensional linear phase FIR Wiener filter can be obtained from the unconstrained filter with a simple “reverse and add” operation. The relation between the linear phase and unconstrained phase filters is obtained also in the case of a multichannelk-dimensional system. In this case, the properties of the autocorrelation matrix do not allow the simplifications noted for the single channel case.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00983560
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  • 3
    Electronic Resource
    Electronic Resource
    Multiresolution Vector Quantization for Video Coding (1997)
    Springer
    Multidimensional systems and signal processing 8 (1997), S. 129-150 
    Details
    ISSN: 1573-0824
    Keywords: video coding ; vector quantization ; low bit rate ; subband coding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract In this work, we propose a coding technique that is based on the generalized block prediction of the multiresolution subband decomposition of motion compensated difference image frames. A segmentation mask is used to distinguish between the regions where motion compensation was effective and those regions where the motion model did not succeed. The difference image is decomposed into a multiresolution pyramid of subbands where the highest resolution subbands are divided into two regions, based on the information given by the segmentation mask. Only the coefficients of the regions corresponding to the motion model failure are considered in the highest resolution subbands. The remaining coefficients are coded using a multiresolution vector quantization scheme that exploits inter-band non-linear redundancy. In particular, blocks in one subimage are predicted from blocks of the adjacent lower resolution subimage with the same orientation. This set of blocks plays the role of a codebook built from coefficients inside the subband decomposition itself. Whenever the inter-band prediction does not give satisfactory results with respect to a target quality, the block coefficients are quantized using a lattice vector quantizer for a Laplacian source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008273024485
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  • 4
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    Frame-Based Multiple-Description Video Coding with Extended Orthogonal Filter Banks (2006)
    Springer
    Details
    Publication Date: 2006-01-17
    Print ISSN: 1687-6172
    Electronic ISSN: 1687-6180
    Topics: Electrical Engineering, Measurement and Control Technology
    Published by Springer
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  • 5
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    Quantifying the impacts of artisanal gold mining on a tropical river system using mercury isotopes (2019)
    In:  Chemosphere
    Details
    Publication Date: 2020-02-12
    Type: info:eu-repo/semantics/article
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  • 6
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    Hg concentrations and stable isotope variations in tropical fish species of a gold-mining-impacted watershed in French Guiana (2021)
    In:  Environmental Science and Pollution Research
    Details
    Publication Date: 2021-11-24
    Description: The aim of the study was to determine if gold-mining activities could impact the mercury (Hg) concentrations and isotopic signatures in freshwater fish consumed by riparian people in French Guiana. Total Hg, MeHg concentrations, and Hg stable isotopes ratios were analyzed in fish muscles from different species belonging to three feeding patterns (herbivorous, periphytophagous, and piscivorous). We compared tributaries impacted by gold-mining activities (Camopi, CR) with a pristine area upstream (Trois-Sauts, TS), along the Oyapock River. We measured δ15N and δ 13C to examine whether Hg patterns are due to differences in trophic level. Differences in δ 15N and δ 13C values between both studied sites were only observed for periphytophagous fish, due to difference of CN baselines, with enriched values at TS. Total Hg concentrations and Hg stable isotope signatures showed that Hg accumulated in fish from both areas has undergone different biogeochemical processes. Δ199Hg variation in fish (-0.5 to 0.2‰) was higher than the ecosystem baseline defined by a Δ199Hg of -0.66‰ in sediments, and suggested limited aqueous photochemical MeHg degradation. Photochemistry-corrected δ202Hg in fish was 0.7‰ higher than the baseline, consistent with biophysical and chemical isotope fractionation in the aquatic environment. While THg concentrations in periphytophagous fish were higher in the gold-mining area, disturbed by inputs of suspended particles, than in TS, the ensemble of Hg isotope shifts in fish is affected by the difference of biotic (methylation/demethylation) and abiotic (photochemistry) processes between both areas and did therefore not allow to resolve the contribution of gold-mining-related liquid Hg(0) in fish tissues. Mercury isotopes of MeHg in fish and lower trophic level organisms can be complementary to light stable isotope tracers.
    Type: info:eu-repo/semantics/article
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