935 resultados para First and Second Order Directional Derivatives


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The left hind foot.-- The f̓raid cat.-- The consolation prize.-- The first high janitor.-- Family ties.-- The ten-share horse.-- A chariot of fire.

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Hearings held Nov. 27, 1973-Jan. 29, 1974

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Reuse of record except for individual research requires license from Congressional Information Service, Inc.

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Hearings held Sept. 18-Nov. 3, 1969, in Washington, D.C.; Jan. 26, 1970, in Cherry Hill, N.J.

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Pt.5: Hearings before the Public Health, Education, Welfare, and Safety Subcommittee.

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A change in curriculum permitted a direct and simultaneous comparison between first and second year responses to group project work while assuming similar prior experience with this method of learning. Responses were obtained by a survey form and by meetings with individual groups. Overall, there were no differences between first and second year responses, although analyses of gender responses suggested trends whereby males indicated they had developed greater creativity and felt they had contributed more to the group. The majority of students responded that group project work was a positive experience and a useful learning experience.

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The human visual system is sensitive to second-order modulations of the local contrast (CM) or amplitude (AM) of a carrier signal. Second-order cues are detected independently of first-order luminance signals; however, it is not clear why vision should benet from second-order sensitivity. Analysis of the first-and second-order contents of natural images suggests that these cues tend to occur together, but their phase relationship varies. We have shown that in-phase combinations of LM and AM are perceived as a shaded corrugated surface whereas the anti-phase combination can be seen as corrugated when presented alone or as a flat material change when presented in a plaid containing the in-phase cue. We now extend these findings using new stimulus types and a novel haptic matching task. We also introduce a computational model based on initially separate first-and second-order channels that are combined within orientation and subsequently across orientation to produce a shading signal. Contrast gain control allows the LM + AM cue to suppress responses to the LM-AM when presented in a plaid. Thus, the model sees LM -AM as flat in these circumstances. We conclude that second-order vision plays a key role in disambiguating the origin of luminance changes within an image. © ARVO.