...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of vision >The darker-is-deeper heuristic for the perception of 3D shape from shading: Is it perceptually or ecologically valid?
【24h】

The darker-is-deeper heuristic for the perception of 3D shape from shading: Is it perceptually or ecologically valid?

机译：从阴影中获得3D形状的感觉越深，越深：在感知上还是生态上有效？

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The darker-is-deeper heuristic was originally proposed by Langer and Zucker (1994) for approximating 3D shape from shading under conditions of diffuse illumination that typically occur for outdoor scenes on a cloudy day, and it is based on the assumption that vignetting is the primary source of luminance variation under those conditions. It was later rejected as a model of human perception by Langer and B??lthoff (2000), because points in concavities that appear to be the deepest are most often located on local luminance maxima. Despite that result, this heuristic has continued to be described in the literature as a viable model of human perception (e.g., Chen & Tyler, 2015; Tyler, 1998), based entirely on the appearance of image intensity gratings, which have little or no connection to real 3D surfaces or patterns of illumination. In this article we will present a large number of examples to show what actually happens when surfaces are viewed under directional and diffuse illuminations. The results will highlight a number of well-known phenomena in addition to vignetting that can influence the pattern of shading on a surface under diffuse illumination, and they will also demonstrate that the darker-is-deeper heuristic is generally invalid for all types of illumination, except in unusual circumstances.
机译：Langer和Zucker（1994）最初提出了“暗的是更深的”启发式算法，该方法用于在通常在阴天的室外场景中发生的漫射照明条件下，从阴影中近似3D形状，并且它基于渐晕是假设。在这些条件下亮度变化的主要来源。后来，Langer和B？lthoff（2000）拒绝将其作为人类感知的模型，因为看起来最深的凹点通常位于局部亮度最大值上。尽管取得了这一结果，但这种启发式方法在文献中仍被描述为一种可行的人类感知模型（例如Chen和Tyler，2015年; Tyler，1998年），完全基于图像强度光栅的出现，而很少或根本没有。连接到真实的3D表面或照明图案。在本文中，我们将提供大量示例，以说明在定向照明和漫射照明下观察曲面时实际发生的情况。结果将突出显示除了会影响漫射照明下的表面阴影图案的渐晕之外的许多众所周知的现象，并且它们还将证明，较深的深度启发法通常不适用于所有类型的照明，除非有特殊情况。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号