Printed Image Relief Evaluation Using Step Height and Gloss
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Solution Overview
Problem
Existing methods fail to provide a quantitative evaluation of relief feel, which is influenced by both the height and gloss level of image boundaries, making it difficult to assess the visibility of steps in printed images.
Innovation Solution
An image quality evaluation method that considers both the step height and gloss level at image boundaries to calculate a quantitative evaluation value, using a device with a specular reflected light receiver and surface height measurer to measure these parameters and a processor to calculate the relief feel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only step height is measured to evaluate relief feel, then measurement is simple, but evaluation accuracy is insufficient because gloss level differences are not considered
Solution Approach 1:
The patent combines step height measurement and gloss level measurement into a single integrated evaluation system. The relief feel evaluation value is calculated by merging both measurement results (step height and gloss level) to comprehensively assess the relief feel, rather than relying on step height alone.
Solution Approach 2:
The patent introduces gloss level as an additional parameter to the traditional step height measurement. By changing the evaluation parameters from single-dimensional (step height only) to multi-dimensional (step height + gloss level), the accuracy of relief feel evaluation is significantly improved.
2Measurement precision
If visual observation is used to evaluate relief feel, then no special equipment is needed, but quantitative evaluation cannot be achieved
Solution Approach 1:
The patent replaces subjective visual observation with objective optical measurement systems. A light source and luminance meter are used to quantitatively measure gloss level, while a step height measuring device objectively measures step height, eliminating the subjectivity of visual assessment.
Solution Approach 2:
The patent introduces measurement devices (light source, luminance meter, step height measurer) as intermediaries between the object being measured and the evaluator. These intermediaries convert physical properties (gloss, height) into quantifiable data that can be processed and evaluated systematically.
3Measurement precision
If laser displacement gauge or laser microscope is used to measure step height, then height measurement is precise, but relief feel cannot be fully evaluated because gloss level is ignored
Solution Approach 1:
The patent creates a multi-functional measurement system that performs both step height measurement and gloss level measurement. The system is designed to evaluate relief feel comprehensively by integrating multiple measurement capabilities into one unified evaluation process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate and comprehensive evaluation of relief feel by considering both step height and gloss level, allowing for improved assessment of image quality and visibility of steps.
Implementation Method 1
a relief feel may be different depending on the difference in the gloss level of an image portion
Implementation Method 2
it is possible to measure the height of a step using a laser displacement gauge or a laser microscope
Data Source
AI summary
An image quality evaluation method to be executed by an information processing apparatus includes: acquiring information about a step at a boundary portion between an image portion, which is formed using a recording material, and a base material portion, which is a ground of the image portion, and a gloss level of the image portion; and calculating an evaluation value of a relief feel on the basis of the acquired information about the step and the gloss level.