MODEL-BASED IMAGE ENHANCEMENT FOR THE VISUALLY IMPAIRED

为视障人士提供基于模型的图像增强

• 批准号: 2888189
• 负责人: ELI PELI
• 金额: $ 33.01万
• 依托单位: SCHEPENS EYE RESEARCH INSTITUTE
• 依托单位国家: 美国
• 财政年份: 1986
• 资助国家: 美国
• 起止时间: 1986-08-01 至 2003-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/2888189
• 关键词: aging; bioimaging /biomedical imaging; blind aid; brightness discrimination; clinical biomedical equipment; clinical research; computer graphics /printing; computer simulation; form /pattern perception; human middle age (35-64); human subject; image enhancement; image processing; medical rehabilitation related tag; photography; psychometrics; quality of life; scotoma; space perception; videotape /videodisc; vision tests; visual perception; visual threshold

Enhancement of video images should enable the visual impaired greater access to TV. and other video sources. In previous years, contrast enhancement based on a band-pass filtering approach was developed and tested. Results were encouraging, showing improved performance in face recognition and in obtaining details from motion videos. Addition improvement will be gained by addressing other aspects of spatial vision beyond the loss of contrast sensitivity. We will study, in patients with central scotomas, the addition of wide-band feature markers improve the performance in localization, and in phase (shape) discrimination tasks, as suggested by studies carried out with normally sighted subjects. Using the results of these studies, we developed a novel extension of the previously used enhancement method, a wide-band enhancement that should have many advantages. The new method as a cartoon-like bar outlines (bipolar light and darkness) and increase the contrast of edge features to facilitate localization and discrimination. We will determine the optical parameters for such enhancement for patients with central scotomas, implement a software based approach to generate enhanced motion video segments and use such segments to measure the preference of visually impaired persons for the enhanced versions. We will continue to develop our visual model, and to use it in the development, evaluation and optimization of image enhancement for the visually impaired. The basic aspect of the study will examine changes in adaptation that occur in the peripheral visual processing with long term central visual loss. We will study performance differences on the number of visual tasks between patients with long term bilateral scotomas and with unilateral scotomas. The study of patients with monocular scotomas will provide better measure of the capability of the peripheral retina. The differences between monocular and bilateral scotomas patients performance will improve our understanding of adaptation to the force used of peripheral retina or form vision. Studies of long term facilitation low vision patients will be used in search for a measure of visual function that will explain and quantify deficit in peripheral retinal such as contour integration. The basic studies results will guide further fine tuning and optimization of the enhancement technique.

视频图像的增强应该使视障人士能够更好地 访问电视。和其他视频源。 对比往年 开发了基于带通滤波方法的增强功​​能 已测试。 结果令人鼓舞，显示面部表现有所改善 识别并从运动视频中获取细节。 添加 通过解决空间视觉的其他方面将获得改进 除了对比敏感度的损失之外。 我们将在患者身上进行研究 对于中心暗点，添加宽带特征标记可以改善 定位和相位（形状）辨别的性能 根据对正常视力者进行的研究表明的任务 科目。 利用这些研究的结果，我们开发了一种新颖的 先前使用的增强方法的扩展，宽带 增强应该有很多优点。 新方法作为 卡通般的条形轮廓（双极光和暗）并增加 边缘特征的对比以促进定位和 歧视。 我们将确定此类的光学参数 增强中心暗点患者的功能，实施软件 基于方法来生成增强的运动视频片段并使用这样的 衡量视障人士对以下内容的偏好的细分 增强版本。 我们将继续开发我们的视觉模型，并且 将其用于图像的开发、评估和优化 为视障人士提供增强功能。 研究的基本方面 将检查周边视觉中发生的适应变化 长期中心视力丧失的处理。我们将研究性能 长视患者之间视觉任务数量的差异 术语双侧暗点和单侧暗点。 研究的 单眼暗点患者将提供更好的测量 周边视网膜的能力。 单眼与单眼的区别 双侧暗点患者的表现将改善我们的 了解对周边视网膜所用力的适应或 形成愿景。 长期促进低视力患者的研究将 用于寻找视觉功能的测量方法来解释和 量化周边视网膜的缺陷，例如轮廓整合。 这 基础研究结果将指导进一步微调和优化 的增强技术。