Spatial-frequency spectra of printed characters and human visual perception.
It is well known that certain spatial frequency (SF) bands are more important than others for character recognition. Solomon and Pelli [Nature 369 (1994) 395-397] have concluded that human pattern recognition mechanism is able to use only a narrow band from available SF spectrum of letters. However, the SF spectra of letters themselves have not been studied carefully. Here I report the results of an analysis of SF spectra of printed characters and discuss their relationship to the observed band-pass nature of letter recognition.
Põder
Endel
E
Laboratory of Cognitive Neuroscience, Tallinn Pedagogical University, 25 Narva Road, 10120, Tallinn, Estonia. ep@tpu.ee
D006801:Humans; D010364:Pattern Recognition, Visual / Q000502:physiology*; D011327:Printing; D011601:Psychophysics; D011932:Reading; D012815:Signal Processing, Computer-Assisted