Biomedical subjects
Publications and source records attributed to A Rosenfeld.
The field of computer vision is devoted to discovering algorithms, data representations, and computer architectures that embody the principles underlying visual capabilities. This article describes how the field of computer (and robot) vision has evolved, particularly over the past 20 years, and introduces its central methodological paradigms.
We conducted a quasi-experiment to evaluate the impact of a Medicare waiver which allowed the use of nurse practitioners (NPs) and physicians assistants (PAs) to deliver primary care to Massachusetts nursing home patients and removed the limits on the reimbursable numbers of visits per month. A carefully matched set of 1,327 Medicaid patients from 95 non-participating homes in the same areas of Massachusetts was compared to 1,324 Medicaid demonstration patients from 75 homes. Information came from specially designed record reviews and the Medicaid and Medicare information systems. Separate analyses were done for newly admitted cases and rollovers. Comparisons of quality of care suggested that the medical groups using NPs and PAs provided as good or better care than did the physicians in the control group. There were no differences in functional status changes or in the use of medications. The demonstration patients received more attention, as reflected in more orders written and an average of one additional visit a month. Demonstration patients showed higher scores on three of seven specially designed quality tracers, congestive heart failure and hypertension for both new administrations and rollovers, and new urinary incontinence for new admissions. Rollovers had significantly fewer emergency and total hospital days. A cost analysis suggests that the use of NPs and PAs saves at least as much as it costs and may save additional money with more sustained use.
This paper reviews some basic computer vision techniques and speculates about their possible relevance to the modeling of human visual processes. Special emphasis is given to image segmentation techniques and how they relate to processes of perceptual organization, such as those embodied in the Gestalt "laws."
Six experiments investigated the preattentive segregation of line-like patterns composed of discrete elements in a background of distractors. The results indicate that other factors in addition to spatial density influence line segregation. Edge alignment, edge length and principal axis orientation also affect line segregation. Differences in the outputs of Gabor filters fail to account for the perceived segregation of the lines. Possible models of line segregation based on element grouping, feature density and search are briefly discussed.
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The author distills the essence of Freud's thinking about incest, placing it within the context of childhood sexuality. He discusses clinical and research implications concerning the relationship between sexual trauma and emotional disturbances, and poses certain perplexing questions that are far from answered.
Social attachment theory can be of value in examining the wide variety of abuse and neglect situations that come to the attention of authorities. We consider evaluation of the parent-child relationship as a crucial part of the judicial process. We have suggested parameters that can be used to evaluate the relationship. We have outlined some of the more common distortions in this relationship that have, in our experience, been associated with the mistreatment of children. The use of social attachment theory has been of great help in understanding the emotional reactions of the many children we have seen for evaluation and treatment. The theory also serves as a potential guide for improvements in social policy. If we are more sensitive to the psychological world of these children, we will be better able to truly protect them.