Method for gaze-controlled text size control, and methods for gaze-based measuring of a text reading speed and of a number of visual saccades per text line
For gaze-controlled text size control of a display, the invention proposes to probe, sample and record a user's horizontal gaze Signal； to subject the gaze Signal to a subband filterbank or wavelet transform； to detect line delimiters in the gaze Signal； to derive a reading speed； to determine, as a number of saccades per text line the number of locations where the gaze Signal has sudden high slope portions surrounded on both sides by portions of markedly smaller slope； to detect, based on the reading speed and the number of saccades, a too small font size Status or a too big font size Status； and to initiate a corresponding font size change. Parts of this method can be used for gaze-based measuring of text reading speed and for gaze-based measuring of number of saccades.
