In our study, on the other hand, we construct an actual hardware system and the software algorithm for performing the performance measurements and analyses that are required in order to avoid the SRs from the eyeglasses. In addition, we propose a method for determining whether a user is wearing eyeglasses during the initial stage and use different algorithms based on whether the user is wearing or not wearing eyeglasses. We also propose a method for calculating the gaze position by estimating the invisible SR based on the parallelogram shape.The remainder of this paper is organized as follows: Section 2 describes the details of the proposed method. The experimental results are presented in Section 3. The conclusions are discussed in the last section.2.?Proposed Method2.1.

Proposed Gaze Tracking System with the Device for Controlling Four IlluminatorsIn our study, we propose a new gaze tracking system with a device that controls four illuminators. Our gaze tracking system is based on a wearable device that includes a lightweight eye capturing camera [17] and is used in a desktop computer environment as shown in Figure 1. A conventional web-camera with a zoom lens of fixed focal length and a universal serial bus (USB) interface is used for the eye capturing camera. The field of view of the eye capturing camera (Figure 1) is ?16.98��~+16.98��.Figure 1.Proposed gaze tracking system.Since the pupil area is usually distinctive in images that are captured by a near-infrared light (NIR) illuminator with a wavelength of 850 nm, the NIR cut filter (in the eye capturing camera) which passes the visible light is replaced with an NIR passing filter [17].

Four NIR illuminators are attached at the four corners of the monitor as shown in Figure 1 [17]. Each illuminator includes 32 NIR light emitting diodes (LEDs) with wavelengths of 850 nm. These four illuminators generate four corneal SRs and the quadrangle defined by these four SRs represents the monitor region [17].We also constructed a device Dacomitinib for controlling the four illuminators as shown in Figure 1. The device is constructed using a USB relay board [18] and it can be turned on and off selectively turn by controlling the power supply to the illuminator. That is, our gaze tracking program in a desktop computer determines whether the illuminator should be on or off and sends the command to the USB relay board via the USB interface.

2.2. Overview of the Proposed MethodThe overall procedure of the proposed method is shown in Figure 2. When the system starts, it performs the initial check in order to determine whether the user is wearing glasses or not.Figure 2.Overall procedure for the proposed gaze tracking method.In previous research, Wu et al., proposed a method for detecting glasses using Haar and Gabor features based on boosting methods.