IMAGE PROCESSING DEVICE, IMAGE PROCESSING METHOD, RECORDING MEDIUM AND PROGRAM

摘要

Image processing device and method are provided. A high-frequency component is transformed by multiplex frequency transformation in response to the gradation transformation to change the dynamic range thereby to produce a satisfactory output image. For example, the gradation of an original image is transformed according to a gradation transformation curve, and the transformed image is then subjected to a discrete wavelet transformation. After this, each sub-band obtained by the discrete wavelet transformation is transformed according to the gradation of the slope transformation curve.