| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an image processing evaluation method for evaluating image processing such as halftone processing. <P>SOLUTION: An image processing evaluation part 4 is provided with an image acquiring part 10 for acquiring an input image f and an output image g obtained by operating halftone processing to the input image f, a frequency converting part 11 for frequency-converting the input image f and the output image g, and for acquiring an input spectrum F and an output spectrum G, a VTF correcting part 12 for correcting the input spectrum F and the output spectrum G based on the spatial frequency characteristics VTF of a visual system to acquire the corrected input spectrum F2 and output spectrum G2, an image noise calculating part 14 for calculating an image noise Nz from a differential spectrum DS obtained by calculating a difference between the corrected input spectrum F2 and output spectrum G2 and an evaluated value calculating part 15 for calculating an evaluation value HV for evaluating the halftone processing from the image noise Nz. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
