Intriligator J
Department of Psychology, Harvard University, Cambridge, MA 02138, USA.
Spat Vis. 1997;11(1):33-41. doi: 10.1163/156856897x00041.
A method that allows the creation of moving random-dot patterns with any desired level of motion coherence is presented. In the present context, a random-dot pattern with 100% coherence is a sliding sheet of dots (all dots move at the same speed and in the same direction). A random-dot pattern with 0% coherence is visual dynamic noise (similar to detuned TV snow). Coherences between 100% and 0% have a specific percentage of the dots moving coherently together, while the remaining 'twinkle' in a random fashion. The use of look-up table animation allows the dot patterns to move smoothly and rapidly even on computers that lack computational speed. Additionally, the coherence of the motion in a particular region of the screen is determined by the spatial arrangement of pixel indices in that local region. Therefore, this technique allows different regions of the screen to have different levels of coherence which makes the creation of motion-defined shapes straightforward. The basics of look-up table animation are discussed and a general algorithm for creating motion with any level of coherence is presented.
本文介绍了一种能够创建具有任意所需运动连贯性水平的移动随机点图案的方法。在当前背景下，具有100%连贯性的随机点图案是一个点的滑动片（所有点以相同速度和相同方向移动）。具有0%连贯性的随机点图案是视觉动态噪声（类似于失调的电视雪花）。100%和0%之间的连贯性表示有特定百分比的点一起连贯移动，而其余的点则随机“闪烁”。使用查找表动画即使在缺乏计算速度的计算机上也能使点图案平滑快速地移动。此外，屏幕特定区域中运动的连贯性由该局部区域中像素索引的空间排列决定。因此，该技术允许屏幕的不同区域具有不同的连贯性水平，这使得创建运动定义的形状变得简单。文中讨论了查找表动画的基础知识，并给出了一种用于创建具有任意连贯性水平运动的通用算法。
