Experiments In Texture Perception

Richards, Whitman

doi:10.21236/ada059630

Cited by 2 publications

(2 citation statements)

References 13 publications

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“…Using a "Texture Display" driven by a DEC PDP-il [Richards, 1978], a pattern consisting of four regions similar to figure I was generated. To test for the general validity of equation ( Such measurements, however, do not test the hypothesis that contrast is used to assess transparency, because no subjective estimates of the transmittance were required.…”

Section: Aohromatio Measurementsmentioning

confidence: 99%

Efficient Computations and Representations of Visible Surfaces.

Richards¹,

Stevens²

1979

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Section: Aohromatio Measurementsmentioning

confidence: 99%

Efficient Computations and Representations of Visible Surfaces.

Richards¹,

Stevens²

1979

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“…Despite large variations in both stimulus characteristics and experimental procedure, in the studies cited above, and in others using different means of generating texture, (e.g., the frequency grating (modulation transfer function) methods used by Anstis (1976) and Richards (1975» display characteristics have been maintained essentially constant.…”

Section: Introductionmentioning

confidence: 99%

Discrimination of Density and Clustering on Four Versions of a Stochastic Display

Newman

Tiffany

1977

Proceedings of the Human Factors Society Annual Meeting

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A number of studies have used stochastically generated visual displays to study detection and discrimination of differences in pattern texture.As in this study, the texture is controlled by a Markov chain paradigm in one or more dimensions.Texture differences are generated either within a given pattern, or between two patterns which are presented simultaneously or sequentially.Other parameters of the display are held constant (e.g., positive and negative images) and therefore not explored.This study investigates the interaction of two texture variables, density and clustering, with the display parameters of positive/negative image and adjancency/separation of texture images. Stimulus display patterns were generated using a two dimensional Markov process to control density and clustering, and were put on 35mm film. Stimuli were presented on a rear projection display, and subjects were required to determine the sameness or difference of the two halves of the display.The major findings of the study are: (1) Performance on the four versions of the display are not equivalent and differ significantly in some respects; (2) Performance on detecting differences in density and in clustering are consistent with earlier studies; and (3) A sharp discontinuity in performance level as a function of the magnitude of standard/variable difference is present for small differences. The findings of this study raise questions as to the generalization of texture data among similar but not identical displays. The presence of the low level discontinuity is also of interest in the interpretation of this data in terms of the theory of signal detectability and the use of the classical ogive.From the application viewpoint, the non-equivalence of the display variants and the presence of the discontinuity may be of significance to problems of target detection on sonar and radar displays.

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Experiments In Texture Perception

Cited by 2 publications

References 13 publications

Efficient Computations and Representations of Visible Surfaces.

Efficient Computations and Representations of Visible Surfaces.

Discrimination of Density and Clustering on Four Versions of a Stochastic Display

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