| 摘要 |
PROBLEM TO BE SOLVED: To provide a density unevenness evaluation technology for printers, capable of surely and easily finding a concentrated part of the density unevenness by the frequency which is to serve as the object of evaluation. SOLUTION: The method for evaluating the density unevenness for printers includes measuring density of a test pattern recorded in a recording medium with fixed target density by driving a print engine based on image data for test print; performing Fourier transformation on spatial frequency data in a predetermined scanning direction of the test pattern obtained through density measurement; performing inverse-Fourier transformation on partial Fourier transform data of a plurality of specific frequency bands in the Fourier transform data obtained through the Fourier transformation and selecting a section with large density fluctuations as a section for density unevenness evaluation from pieces of specific band spatial frequency data for each specific frequency band obtained through the inverse-Fourier transformation. COPYRIGHT: (C)2011,JPO&INPIT
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