The smooth motion parallax of light field displays is one of the most critical enablers of the glasses-free autostereoscopic 3D experience. This smoothness originates from an acceptable degree of angular resolution, which is derived from the number of views visualized in the given field of view. However, if human observers view the content without any movement, the requirement for angular resolution can be lower. In this paper, we introduce the results of a subjective quality assessment of visual content displayed on a light field cinema. The angular resolution of the content was different in each test condition, and participants were located in fixed positions during the experiment.
Fast and accurate in-line areal surface topography measuring instruments are required to control the quality of microscale manufactured components, without significantly slowing down the production process. Full-field areal optical surface topography measurement instruments are promising for in-line or on-machine measurement applications due to their ability to measure quickly, to access small features and to avoid surface damage. This paper presents the development and integration of a compact optical focus variation sensor for on-machine surface topography measurement mounted on to a hybrid ultraprecision machine tool. The sensor development is described and a case study involving the on-machine dimensional measurement of the depth of hydrophobic microscale features, including microchannels and micro-dimples, is presented. Comparisons of results between the on-machine measurements obtained by the developed sensor and a desktop focus variation microscope are presented and discussed. The comparison results show that the developed focus variation sensor is able to perform on-machine dimensional measurement of microscale features within sub-micrometre accuracy.
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