Abstract
In this paper two specific questions are considered: (1) When image energy is defined in terms of orientation and frequency components of the image spectrum, how much energy is detected as a function of contrast? (2) Does the visual system have a limited resolution for image orientation and frequency components which define the psychophysical upper limits for two dimensional image coding units? To examine these two questions, experiments were conducted with both black/white and gray-scaled images. The results indicate a monotonic relationship between image contrast and energy processed. Finally, results demonstrate that the upper lindts (or resolution) for discriminable spectral orientation and spatial frequency are approximately 5 deg and 1/8 octave, respectively. Image domain demonstrations confirm these results.
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Caelli, T. M., & Htibner, M.On the number of intensity levels detected in textures. Manuscript submitted for publication, 1983.
Daugman, J.Uncertainty relation for resolution in space, spatial frequency and orientation optionized by two-dimensional visual cortical filters. Unpublished manuscript, 1981.
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This research was funded by a grant from the Australian Research Grants Committee.
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Caelli, T. Energy processing and coding factors in texture discrimination and image processing. Perception & Psychophysics 34, 349–355 (1983). https://doi.org/10.3758/BF03203047
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DOI: https://doi.org/10.3758/BF03203047