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- Vegelius, Jan, et al.
(author)
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Polari, a Fortran IV program for measures of attitudinal polarization
- 1976
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In: Educational and Psychological Measurement. - : SAGE Publications. - 0013-1644 .- 1552-3888. ; 36:3, s. 717-719
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Journal article (peer-reviewed)abstract
- The two major purposes of this paper were: (1) to describe the theoretical background underlying the mathematical development of different measures of the degree of attitudinal polarization applicable to bipolar questions and (2) to outline a small FORTRAN IV program POLARI that provides a rapid means for calculation of four of these measures.
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- Granlund, Gösta H.
(author)
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A Nonlinear, Image-content Dependent Measure of Image Quality
- 1977
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Reports (other academic/artistic)abstract
- In recent years, considerable research effort has been devoted to the development of useful descriptors for image quality. The attempts have been hampered by i n complete understanding of the operation of the human visual system. This has made it difficult to relate physical measures and perceptual traits.A new model for determination of image quality is proposed. Its main feature is that it tries to invoke image content into consideration. The model builds upon a theory of image linearization, which means that the information in an image can well enough be represented using linear segments or structures within local spatial regions and frequency ranges. This implies a l so a suggestion that information in an image has to do with one- dimensional correlations. This gives a possibility to separate image content from noise in images, and measure them both.Also a hypothesis is proposed that the visual system of humans does in fact perform such a linearization.
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