| 摘要 |
PURPOSE:To eliminate locality without separate read scanning by applying discrete Fourier transformation to picture data so as to extract a locality equivalent component and using data obtained by applying inverse discrete Fourier transformation to the component thereby eliminating the locality. CONSTITUTION:A conversion means 10 applies discrete Fourier transformation to read picture data. The data corresponding to a frequency of the locality and frequencies at an integer multiple of the frequency among the converted data have an eminent value in comparison with the data in the vicinity of the former data because of the periodicity of the locality. An extract means 12 extracts the eminent portion as a portion equivalent to the locality. The inverse conversion means 14 applies inverse discrete Fourier transformation to the extracted portion equivalent to the locality. Then an eliminating means 16 uses the portion equivalent to the locality after the inverse conversion to eliminate the locality from the picture data. |
