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A controllable anti-aliasing filter for digital film cameras

机译：用于数码胶片相机的可控抗混叠滤波器

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In this paper, the theoretical foundation and practical implementation of a controllable anti-aliasing filter for digital film cameras is presented. A prototype of an optical anti-aliasing filter that is based on moving a parallel optical window was designed and built to demonstrate the ability to control the spatial frequency response of an acquisition system. During the image exposure, four spring-preloaded voice coils rapidly change the pitch and yaw of the parallel window, resulting in a displacement of the image content that is projected onto the sensor. The image content displacement during the exposure results in altering the frequency response of the scene that is captured by the sensor. Specifically, during the exposure time, a carefully controlled movement of the parallel optical window results in a circular trajectory of the image content that is projected onto the sensor. By increasing or decreasing the radius of the circular trajectory, the spatial cut-off frequency of the system is dynamically modified, hi addition to the circular path, this paper shows theoretical justification and demonstrates the use of more complex trajectories, such as double circular, elliptical, and one-dimensional rectangular trajectories. These trajectories improve the suppression of aliased components in the acquired image.
机译：本文提出了一种可控的数字电影摄影机抗混叠滤波器的理论基础和实际应用。设计并构建了基于移动平行光学窗口的光学抗混叠滤波器的原型，以演示控制采集系统的空间频率响应的能力。在图像曝光期间，四个弹簧预紧的音圈会迅速改变平行窗口的音调和偏航，从而导致投影到传感器上的图像内容发生位移。曝光期间图像内容的位移会导致传感器捕获的场景的频率响应发生变化。具体地，在曝光时间期间，平行光学窗口的受控运动导致投影到传感器上的图像内容的圆形轨迹。通过增加或减小圆轨迹的半径，可以动态修改系统的空间截止频率。除了圆轨迹之外，本文还展示了理论上的依据，并演示了更复杂的轨迹的使用，例如双圆，椭圆和一维矩形轨迹。这些轨迹改善了对所获取图像中混叠分量的抑制。

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