This study aims to develop a method that can detect the areas of Japanese texts that are difficult to read on a PC screen by analyzing eye movements. An effective method for detecting the areas of text that are difficult to read is to create a heatmap and consider the areas where the eye stays for longer than a fixation duration threshold (threshold). Usually, the threshold is determined through a 50 ms step search. However, since the eye stay time (fixation duration) for difficult-to-read text is longer than the fixation duration when reading smoothly, it is expected that steps that last longer than 50 ms are more effective at detecting the threshold. Furthermore, there are individual differences in the speed at which we comprehend text. In this study, we proposed a method that considers both the efficient search and individual differences among each subject. The experimental results showed that the threshold determined by the proposed method is more useful than the thresholds of 1000 and 800 ms that were used in a previous study, as well as the usual fixation duration of 250 ms.

This study demonstrates the gaze position on a PC monitor while typing with and without browsing any sources. Six subjects (touch-typing and non-touch-typing) entered text with and without browsing a web page, and we analyzed the percentage of gaze on each window of the software running on the monitor. The proposed method comprises three steps: detecting the entry operation of a word processor or text editor, determining the browsing in inactive windows, and outputting the referenced source title. Experiments show that the proposed method can accurately determine whether any source is browsed during the entry operation.

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