Texture Reproduction via MTF Segmentation for Ink Conversion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for reproducing optical texture in printed materials, such as those using UV printing, face challenges in accurately reproducing internal scattering and color, leading to visible color errors and poor graininess due to the limitations of finite ink combinations and lack of consideration for human visual characteristics.
Innovation Solution
A conversion processing method that separates texture characteristic information into internal scattering and color signal information, using modulation transfer function values as inputs for lookup table conversion processing to improve the accuracy of ink amount calculations, thereby enhancing the reproduction of optical texture in printed materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If lookup table conversion processing is performed using finite ink combinations to reproduce optical texture, then the reproduction of internal scattering can be achieved, but color errors become visible and graininess increases due to limitations in ink combination finiteness
Solution Approach 1:
The patent segments the texture characteristic information into two distinct components: internal scattering information (MTF values at non-zero spatial frequencies) and color signal information (MTF values at zero spatial frequency). This segmentation allows each component to be processed and converted independently through the lookup table, enabling high-accuracy reproduction of internal scattering while maintaining color accuracy by treating color as a separate dimension that is not compromised by the finiteness of ink combinations.
2Productivity
If texture characteristic information is converted to ink amount information using conventional methods, then the reproduction process can be completed, but graininess and tone jump occur due to lack of consideration for human visual characteristics
Solution Approach 1:
The patent changes the parameter representation by using Modulation Transfer Function (MTF) values at different spatial frequencies as the basis for conversion. By separating and processing MTF values at zero spatial frequency (color) and non-zero spatial frequencies (internal scattering) independently, the method achieves more uniform image quality and reduces graininess and tone jump while maintaining efficient reproduction process.
3Device complexity
If all MTF values are processed together in the lookup table conversion, then the conversion process is simple, but both internal scattering and color reproduction accuracy are compromised
Solution Approach 1:
The patent applies segmentation by dividing the MTF values into two distinct groups: those at zero spatial frequency (representing color information) and those at non-zero spatial frequencies (representing internal scattering characteristics). This segmentation enables the lookup table conversion to process each type of information separately, achieving high accuracy for both internal scattering and color reproduction simultaneously, while the overall process remains manageable in complexity.
Data Source
AI summary
There are provided a conversion processing method of performing LUT conversion processing for converting, via a lookup table (LUT), texture characteristic information of an object of which texture is to be reproduced into ink amount information of an ink, which is used in order to reproduce the object of which texture is to be reproduced on a medium, the conversion processing method for optical texture reproduction in which the texture characteristic information is separated into internal scattering information and color signal information, the internal scattering information and the color signal information, which are separated out, are used as inputs of the LUT conversion processing, and as values of a modulation transfer function as the internal scattering information and the color signal information are used in the LUT conversion processing, reproduction of internal scattering and reproduction of color reproduction, which are important qualities of texture, can be simultaneously realized with high accuracy in print production of performing texture reproduction, a printed material production method, and a printed material production system.