Methods for Evaluating Pictures and Extracting Music by 2D DFA and 2D FFT

This study proposes the following two methods applying two-dimensional DFA (detrended fluctuation analysis) and two-dimensional FFT (fast Fourier transform) algorithm: (1) a method for finding pleasant photographs of local tourist spots, and (2) a method for generating music from these photographs. We define “pleasant image” as the photograph containing 1/ f noise components since it has been suggested that the 1/ f -noise structure in visual art as well as in music can stimulate the perception of pleasant. The method for extracting music from the picture is developed as follows: (a) the image is divided into some squares and frequency components are extracted from each square by two-dimensional FFT, and then (b) the frequency components of each square are transformed into musical pitches. A method to arrange the music by reflecting features of the image is also provided.