Tokyo Institute of Technology

Hiroshi Furuya

Yoshiki Nakamura

A data converting apparatus and a data converting program are suitable to quantitatively estimate, based on a temporal alteration of a stimulus value, a temporal alteration of a sensitivity brought to human beings. The data converting apparatus includes a decomposing unit subjecting temporal alteration data of a stimulus value to wavelet decomposition to extract plural time-frequency components contained in the temporal alteration data, a weighting unit weighting the plural extracted time-frequency components weighting coefficients which are predetermined based on a relationship between a temporal alteration of a stimulus value and a temporal alteration of a sensitivity of human beings to the stimulus value, and a synthesizing unit subjecting the plural weighted time-frequency components to wavelet synthesis to estimate a sensitivity brought to human beings when the stimulus value is subjected to temporal alteration according to the temporal alteration data.

Data converting apparatus and medium having data converting program

It is an object of the present invention to provide an image transform apparatus and an image transform program which can reduce a computation load for transforming a luminance image to a brightness image. The present invention attains the object by performing wavelet resolution of the luminance image first to generate J pieces (J is an integer equal to two or more) of sub band images, transforming a luminance value of each pixel of the sub band images to a brightness impression value based on a predetermined relation between luminance and brightness impression, and then performing wavelet synthesis of K pieces (K is an integer equal to two or more; K&#x2266;J) of sub band images having been subjected to the transformation of the luminance values to the brightness impression values, to generate a brightness image.

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Yokohama, Japan

Hiroshi Furuya