Visual Perception and Coding of Texture

视觉感知和纹理编码

• 批准号: 7114845
• 负责人: MICHAEL S LANDY
• 金额: $ 33.38万
• 依托单位: NEW YORK UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-09-01 至 2009-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7114845
• 关键词: behavior test; behavioral /social science research tag; clinical research; computer graphics /printing; computer system design /evaluation; form /pattern perception; functional magnetic resonance imaging; human subject; neuropsychology; psychophysics; questionnaires; sensory discrimination; statistics /biometry; visual cortex; visual perception

DESCRIPTION (provided by applicant): The experiments in this proposal share two basic themes. The first is that visual texture stimuli may be used to probe the initial visual coding of images and image sequences. The second theme is to relate all of our work to a basic 4-stage, multiple channel model, the "back-pocket model of texture segregation." Each channel consists of (1) an initial linear spatial filter, (2) a nonlinearity, and (3) a second linear filter. These channels feed (4) a combination rule or linking hypothesis that yields a response or prediction of performance in a given task. Our work attempts to confirm this model, characterize its mechanisms, analyze its capabilities, and relate it to the underlying physiology. This proposal has three major aims. The first aim concerns the coding and appearance of natural textures. We investigate whether human texture coding is matched to the statistics of natural textures and the degree to which observers can estimate physical characteristics of textures independent of viewing conditions. The second aim investigates how the back-pocket model channels are used for the identification of texture defined objects and includes further investigations of the structure and selectivity of back-pocket model channels. The third aim is to investigate the cortical implementation of texture or 2nd-order channels using fMRI to measure responses to and adaptation to texture modulations.

描述（申请人提供）：该提案中的实验共享两个基本主题。首先是可视纹理刺激可用于探测图像和图像序列的初始视觉编码。第二个主题是将我们的所有作品与基本的4阶段多通道模型，即“纹理隔离的后口袋模型”相关联。每个通道由（1）初始线性空间滤波器，（2）非线性和（3）第二个线性滤波器组成。这些渠道为（4）组合规则或连接假设，该假设在给定任务中产生响应或预测。我们的工作试图确认该模型，表征其机制，分析其能力并将其与基础生理学联系起来。该提议具有三个主要目标。第一个目的涉及自然纹理的编码和外观。我们研究了人类纹理编码是否与自然纹理的统计数据以及观察者可以估算独立于观察条件的纹理的物理特征的程度。第二个目标研究了如何使用后口袋模型通道来识别纹理定义的对象，并包括对后口袋模型通道的结构和选择性的进一步研究。第三个目的是使用fMRI研究纹理或二阶通道的皮质实现，以测量对纹理调制的响应和适应性。