Spatial Layout and Image Scale in Low Vision

低视力的空间布局和图像比例

• 批准号: 7049502
• 负责人: ARIES Robert ARDITI
• 金额: $ 12.29万
• 依托单位: LIGHTHOUSE INTERNATIONAL
• 依托单位国家: 美国
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-04-01 至 2008-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7049502
• 关键词: clinical research; human subject; imagery; neural information processing; psychophysics; scotoma; space perception; vision; visual fields; visual perception

DESCRIPTION (provided by applicant): This proposal has the long-term goal of understanding how people with low vision analyze and process two-dimensional layout of images and scenes at multiple scales. The overarching theme of the proposed studies is perception of spatial layout in low vision, particularly on layout in two dimensions such as, for example, perception of a magnified or unmagnified computer screen, or of a monocular image of a visual scene through an optical or video distance telescopic aid. Using subjects with a highly prevalent form of low vision, central visual field loss (CFL), and normally-sighted subjects under both normal viewing conditions and simulated CFL, two main issues will be addressed using psychophysical methods: Global layout perception: Image element identification and accuracy of element localization will be measured with three kinds of (unmagnified) images: web pages, natural urban scenes and colored drawings composed of basic shapes. Exposure duration will also be varied in order to assess the degree to which spatial layout can be retained pre-attentively from glimpses of such images. Linking global and local views: The strategies people use in attempting to link objects in global view to objects they re-image within a magnified image view will be examined, by 1) measuring subjects' accuracy in assessing the amount of magnification required to perform focal visual tasks based on information that is sub threshold with respect to those tasks, by 2) assessing ability to learn to assess magnification needs accurately based on feedback, and by 3) assessing subjects' abilities to gauge direction and size of pointing errors based on feedback from a magnified view, as a function of magnification.

描述（由申请人提供）：本提案的长期目标是了解弱视人群如何在多个尺度上分析和处理图像和场景的二维布局。拟议研究的主要主题是低视力者对空间布局的感知，特别是对二维布局的感知，例如，对放大或未放大的计算机屏幕的感知，或通过光学或视频距离望远镜辅助装置对视觉场景的单目图像的感知。使用高度流行的低视力，中央视野丧失（CFL）的受试者，以及在正常观看条件和模拟CFL下视力正常的受试者，将使用心理物理学方法解决两个主要问题：