Video Tachistoscope

与标准照相/光学速示器相比， 视频速示器在图像方面将具有更大灵活性 创建、存储和呈现。 然而，标准视频 帧速率不能给出足够的时间分辨率， 实验展示 托马斯博士将制作并测试一段视频 速示器，每秒500帧，512 x 512像素 每帧，每像素8位。 以每秒500帧的速度， 时间分辨率是一个帧间隔或2毫秒， 是使用速示的知觉实验所必需的 时空响应研究中的几个问题 特征或运动。 快速显示系统将包括 一个专门设计的带有P167荧光粉的监视器，一个控制器， 带有图像存储器和与微型计算机的接口。 的 控制器存储器模块将存储1到1238个图像， 可以由计算机生成，或者从 刺激图像 显示序列将是可编程的， 所存储的图像中的每一个可以被显示用于指定的 视频帧数。 在第一阶段，托马斯博士将建立 第一台仪器，并测试其电子和光学 特色 在第二阶段，他计划进行实验， 使用当前标准的速示器和新的 仪器，然后继续使用视频速示仪， 各种视觉感知和衰老的实验，以及 开发软件，以有效地利用高度灵活和 强大的工具。 在第一个单元之后，新仪器 应该相对便宜，许多研究都负担得起， 实验室、学术部门和视力测试实验室。

Compared with a standard photographic/optical tachistoscope, a video tachistoscope would have more flexibility in image creation, storage, and presentation. However, standard video frame rates do not give sufficient temporal resolution in experimental displays. Dr. Thomas will build and test a video tachistoscope capable of 500 frames per second, 512 x 512 pixels per frame, and 8-bits per pixel. At 500 frames per second, the temporal resolution is one frame interval or 2 milliseconds which is necessary for perceptual experiments using tachistoscopic presentations in the study of spatiotemporal response characteristics or motion. The fast display system will consist of a specially designed monitor with P167 phosphor, a controller with image memory, and an interface to a microcomputer. The controller memory module will store from 1 to 1238 images which could be generated by the computer or selected from a library of stimulus images. The display sequence will be programmable so that each of the stored images can be displayed for a specified number of video frames. In Phase I, Dr. Thomas will build the first instrument and test its electronic and optical characteristics. In Phase II, he plans to conduct experiments using both the currently-standard tachistoscope and the new instrument, then proceed to use the video tachistoscope in various experiments in visual perception and aging, as well as develop software for efficient use of the highly flexible and powerful instrument. After the first unit, the new instrument should be relatively inexpensive and affordable by many research labs, academic departments, and vision testing labs.