2006 年 90 巻 2 号 p. 97-101
A method for performing bi-directional conversion between luminance and brightness images was devised by using a wavelet transform. The method was similar to a contrast profile method, which can be used to analyze the luminance contrast in complex luminance distributions. We found that a brightness image could be obtained from a luminance image by applying a decomposition and reconstruction procedure on an orthogonal mother wavelet. A bi-directional conversion system was developed using a nearly symmetrical orthogonal wavelet, ‘Symlet 6,’ and the practical uses for the system were discussed.