Screen corner detection using polarization camera for cross-ratio based gaze estimation

M. Sasaki, Takashi Nagamatsu, K. Takemura
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引用次数: 7

Abstract

Eye tracking, which measures line of sight, is expected to advance as an intuitive and rapid input method for user interfaces, and a cross-ratio based method that calculates the point-of-gaze using homography matrices has attracted attention because it does not require hardware calibration to determine the geometric relationship between an eye camera and a screen. However, this method requires near-infrared (NIR) light-emitting diodes (LEDs) attached to the display in order to detect screen corners. Consequently, LEDs must be installed around the display to estimate the point-of-gaze. Without these requirements, cross-ratio based gaze estimation can be distributed smoothly. Therefore, we propose the use of a polarization camera for detecting the screen area reflected on a corneal surface. The reflection area of display light is easily detected by the polarized image because the light radiated from the display is polarized linearly by the internal polarization filter. With the proposed method, the screen corners can be determined without using NIR LEDs, and the point-of-gaze can be estimated using the detected corners on the corneal surface. We investigated the accuracy of the estimated point-of-gaze based on a cross-ratio method under various illumination and display conditions. Cross-ratio based gaze estimation is expected to be utilized widely in commercial products because the proposed method does not require infrared light sources at display corners.
基于交叉比注视估计的偏振相机屏幕角检测
眼动追踪是一种测量视线的方法,有望成为用户界面的一种直观、快速的输入方法,而基于交叉比率的方法利用单应性矩阵计算凝视点,因为它不需要硬件校准来确定眼动相机和屏幕之间的几何关系,因此受到了关注。然而,这种方法需要近红外(NIR)发光二极管(led)附着在显示器上,以检测屏幕角落。因此,必须在显示器周围安装led来估计凝视点。如果没有这些要求,基于交叉比的注视估计可以平滑地分布。因此,我们建议使用偏振相机来检测反射在角膜表面的屏幕区域。由于从显示器发出的光被内部偏振滤光片线性偏振,因此很容易通过偏振图像检测显示光的反射区域。该方法可以在不使用近红外led的情况下确定屏幕角,并利用检测到的角膜表面角来估计凝视点。我们研究了在不同光照和显示条件下,基于交叉比法估计注视点的精度。由于该方法不需要在显示角处使用红外光源,因此有望在商业产品中得到广泛应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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