MODEL-BASED IMAGE ENHANCEMENT FOR THE VISUALLY IMPAIRED

视频图像的增强应能使视障者更 访问电视。以及其他视频源。 前几年，对比 基于带通滤波方法的增强被开发， 测试. 结果令人鼓舞，显示在面对 识别和从运动视频中获取细节。 此外 通过解决空间视觉的其他方面， 除了对比敏感度的损失。 我们将在患者中研究 对于中心暗点，宽带特征标记的添加改善了 定位性能和相位（形状）辨别性能 任务，正如正常视力进行的研究所建议的那样， 科目 利用这些研究结果，我们开发了一种新的 扩展以前使用的增强方法，宽带 增强应该有很多优点。 新方法作为 卡通般的条形轮廓（两极光明和黑暗）， 边缘特征的对比度有助于定位， 歧视 我们将确定这样的光学参数 为患有中心暗点的患者提供增强功能， 用于生成增强的运动视频片段的基于方法，并使用这种方法 部分，以衡量视障人士对 增强版本。 我们将继续发展我们的视觉模型， 将其用于图像的开发、评估和优化 为视障人士而设的设施。 研究的基本方面 将检查发生在周边视觉适应的变化， 长期的中央视觉丧失。我们将研究性能 长时间睡眠患者的视觉任务数差异 术语双侧暗点和单侧暗点。 研究 单眼暗点的患者将提供更好的测量 周边视网膜的能力。 单眼之间的区别 和双侧暗点患者的表现将提高我们的 理解对周边视网膜所用力的适应，或 形成视觉。 长期易化低视力患者的研究将 用于寻找视觉功能的测量， 定量周边视网膜的缺陷，例如轮廓整合。 的 基础研究结果将指导进一步的微调和优化 增强技术。

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.