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A model of human vision.

Silverstein, David Amnon.

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A model of human vision.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	A model of human vision./
作者:	Silverstein, David Amnon.
面頁冊數:	147 p.
附註:	Chair: Stanley A. Klein.
Contained By:	Dissertation Abstracts International60-06B.
標題:	Psychology, Psychometrics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9931401
ISBN:	0599316187

A model of human vision.
Silverstein, David Amnon.

A model of human vision. - 147 p.

Chair: Stanley A. Klein.

Thesis (Ph.D.)--University of California, Berkeley, 1999.

In the model presented here, we use a conventional but flexible formulation of a vision model. In the past, the free parameters of a model have been set directly from measurements of human sensitivity to periodic windowed gratings, or from parameters motivated by physiological or information-theoretical grounds. Instead, we use a constrained regression technique to determine optimal values for the model's parameters. By fitting the free parameters of the model to a set of data, the success of the model was evaluated with a chi-square analysis.

ISBN: 0599316187Subjects--Topical Terms:

1017742
Psychology, Psychometrics.

A model of human vision.
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245 1 0 $a A model of human vision.
300 $a 147 p.
500 $a Chair: Stanley A. Klein.
500 $a Source: Dissertation Abstracts International, Volume: 60-06, Section: B, page: 3011.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 1999.
520 $a In the model presented here, we use a conventional but flexible formulation of a vision model. In the past, the free parameters of a model have been set directly from measurements of human sensitivity to periodic windowed gratings, or from parameters motivated by physiological or information-theoretical grounds. Instead, we use a constrained regression technique to determine optimal values for the model's parameters. By fitting the free parameters of the model to a set of data, the success of the model was evaluated with a chi-square analysis.
520 $a In addition to the model, we describe an experiment that could provide a basis for extending the model to include motion detection. We were interested in measuring the detectability of directed movement. Subjects were presented with two features (dots or lines) that either oscillated in-phase (moved in the same direction) or in counterphase (moved in opposite directions). We measured both the threshold amplitude required for detecting motion and for discriminating the relative phase of motion at different frequencies. Contrary to previous findings, a temporal frequency of more than 8 Hz degrades discrimination thresholds relative to detection and at 14 Hz increases them more than 5-fold.
520 $a A successful model of human vision could have broad applicability to a number of vision science and imaging problems, and we discuss using a model as part of an enhancement scheme. Restoration techniques have ignored a unique feature that can be exploited when working with digital compression. Before the image is stored or transmitted, the sender has access to both the original and the distorted images, enabling the encoder to transmit information specifying the regions where the enhancement was successful. Before storage or transmission the sender produces a compressed and decompressed (codec) file, and assesses the efficacy of one or more enhancement schemes. To determine which image regions have been improved by the enhancement, the enhanced codec is compared to the original. A map of where the enhancement scheme was successful is encoded into the image by making tiny adjustments to the image itself. This method can comply with many compression standards, adds nothing to the compressed images' bandwidth, and distorts the image by only a very tiny amount.
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