F. Ratliff, "Contour and Contrast," Scientific American, Vol. 226, No. 6, pp. 91101, June 1972. Home/Search Document Not in Database Summary Related Articles Check |
This paper is cited in the following contexts:
Survey of Continuities of Curves and Surfaces - Veltkamp (1994) (Correct)
....a smooth surface, and try to give and impression of smoothness by a continuously varying color intensity. However, when the intensity changes continuously between two surface patches, but the derivative of the intensity does not, one perceives the well known Mach bands, discovered by Mach in 1865 [66, 67]. The Mach band effect is the perception of a darker band on the dark patch and a lighter band on the light patch along the border between the patches. The perception of Mach bands is caused by our visual system that exaggerates intensity changes where the actual intensity or intensity derivative ....
Floyd Ratliff. Contour and contrast. Scientific American, 226(6):90 -- 101, June 1972.
Towards Accurate And Efficient Volume Rendering - Novins (1994) (Correct)
....[Lev88,UK88,WG91] However, it has some drawbacks. It is limited by its requirement that there exist hexahedral cells, therefore it is not appropriate for irregularly sampled data. Furthermore, the derivative discontinuity at cell boundaries can result in perceptual anomalies such as Mach banding [Rat72] The result of linear interpolation is shown in Figure 3.8. Piecewise constant and trilinear interpolation are both forms of a general interpolation strategy called polynomial spline interpolation. These result in the 40 2 1 1 2 0.5 1 2 4 6 8 10 12 14 (a) b) Figure 3.8: Reconstruction ....
Floyd Ratliff. Contour and contrast. Scientific American, 226(6):91-- 101, June 1972.
Seeing Things - Wilson, Knutsson (1994) (1 citation) (Correct)
....data are continuous. In real animals, which need to store and process such low level representations, the quantity of information involved is clearly a significant factor. The idea that low level vision serves a coding function is one which is both widespread in the literature on biological vision [40, 41] and is implicit or explicit in several works on neural networks for low level vision [42, 43, 44] And what is the output of a coder, if not symbols 13 Figure 9: Avoidance procedure improves the continuous cockroach performance. The branch of information theory dealing with this problem is ....
F. Ratliff,"Contour and Contrast", in Recent Progress in Perception, ed. R. Held and W. Richards, San Francisco, Freeman, 1976.
Efficient Rendering of Radiosity using Textures and.. - Bastos, Goslin, Zhang (1996) (1 citation) (Correct)
....samples. Usually, the radiosity function is reconstructed using bilinear interpolation of neighboring samples. One can see this is a good approximation inside the region being represented, but it is not at the edges [3] 4] 17] Our visual system is sensitive to derivative discontinuities [13] and the C 0 bilinear interpolation between any neighboring regions leads to noticeable visual Mach band artifacts [1] 15] According to Bastos [1] a bicubic interpolation scheme can ensure up to C 1 continuity (first derivative) of the reconstructed function. This type of interpolation can ....
....subdivision creating T vertices in the mesh (vertices 9 and 10) T vertices are undesirable because the interpolated values at those points will be different from the radiosity value actually computed at that same point. This generates a visual discontinuity along the edges supporting that vertex [13]. flattened full quadtree) Corresponding texture letter = interpolated radiosity number = computed radiosity m l i h g f e d c b a 0 4 1 5 2 8 9 7 10 13 12 6 11 3 # = vertices restricted quadtree Corresponding of a quadrilateral Adaptive subdivision quad A B C D E F G H 0 1 2 3 4 5 6 7 8 9 10 ....
RATLIFF, F. Contours and Contrast. Scientific American, 226(6):91-101, June 1972.
Edge and Mean Based Image Compression - Desai, Mizuki, Masaki, Horn (1996) (Correct)
....parts of the image. Since the mean square error measure is not based on properties of the human visual system, algorithms using this measure tend to produce unacceptable results at low bit rates. One of the most interesting properties of human visual perception is its sensitivity to edges [1, 2]. This suggests that edges can provide an efficient image representation, making edge based compression techniques very useful, even at high compression ratios. There has been some previous work on edge based compression, in particular, by Graham, Kocher, and Carlsson. Graham [3] considers an ....
F. Ratliff, Contour and contrast, Sci. Am., Vol. 226, No. 6, June 1972, pp. 99-101.
K. R. Carver and J. W. Mink, "Microstrip Antenna.. - Reineix And Jecko (Correct)
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F. Ratliff, "Contour and Contrast," Scientific American, Vol. 226, No. 6, pp. 91101, June 1972.
Luminance Gradients: Photometric Analysis and Perceptual.. - Ashdown (1995) (2 citations) (Correct)
No context found.
Ratliff, F. 1971. "Contour and Contrast," Proc. American Philosophical Society 115(2):150163 (April).
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