Blignaut Pieter
University of the Free State Bloemfontein, South Africa.
J Eye Mov Res. 2018 Mar 21;11(1). doi: 10.16910/jemr.11.1.4.
Following a patent owned by Tobii, the framerate of a CMOS camera can be increased by reducing the size of the recording window so that it fits the eyes with minimum room to spare. The position of the recording window can be dynamically adjusted within the camera sensor area to follow the eyes as the participant moves the head. Since only a portion of the camera sensor data is communicated to the computer and processed, much higher framerates can be achieved with the same CPU and camera. Eye trackers can be expected to present data at a high speed, with good accuracy and precision, small latency and with minimal loss of data while allowing participants to behave as normally as possible. In this study, the effect of headbox adjustments in real-time is investigated with respect to the above-mentioned parameters. It was found that, for the specific camera model and tracking algorithm, one or two headbox adjustments per second, as would normally be the case during recording of human participants, could be tolerated in favour of a higher framerate. The effect of adjustment of the recording window can be reduced by using a larger recording window at the cost of the framerate.
根据托比（Tobii）拥有的一项专利，通过减小记录窗口的尺寸，使其刚好能容纳眼睛且留出最小的多余空间，CMOS相机的帧率可以提高。记录窗口的位置可以在相机传感器区域内动态调整，以便在参与者移动头部时跟踪眼睛。由于只有一部分相机传感器数据被传送到计算机并进行处理，因此在使用相同CPU和相机的情况下，可以实现更高的帧率。预计眼动仪能够以高速呈现数据，具有良好的准确性和精确性，低延迟且数据丢失最少，同时允许参与者尽可能正常地表现。在本研究中，针对上述参数研究了实时调整头盒的效果。结果发现，对于特定的相机型号和跟踪算法，在记录人类参与者时通常每秒进行一到两次头盒调整，为了获得更高的帧率是可以接受的。通过使用较大的记录窗口，以帧率为代价，可以减少记录窗口调整的效果。
