Thick Image Compensation for Shadow and Laser Diffusion
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Solution Overview
Problem
Image production methods that create images with thickness result in shading effects due to multidirectional illumination, causing the image to appear darker and more blurred than intended, and are exacerbated by laser diffusion effects in the substrate material.
Innovation Solution
A processing method that models the image production device using a transfer function to predict the image and inverts it to determine an optimal production setpoint, minimizing shading and laser diffusion effects by iteratively calculating a colorimetric distance between the objective and predicted images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If an image is produced with thickness using laser engraving or micro-perforation, then the image has visible depth and tactile quality, but a shading effect occurs causing the image to appear darker and more blurred than intended
Solution Approach 1:
The patent applies preliminary action by calculating and applying compensation values to the production setpoint before actual image production. The transfer function models the shading effect in advance, and the inverted transfer function pre-compensates the production parameters so that when the thick image is produced, the shading effect is already accounted for, resulting in the desired brightness distribution.
Solution Approach 2:
The patent changes parameters by modifying the production setpoint based on the inverted transfer function. The system adjusts production parameters (such as laser energy distribution or micro-hole depth) to compensate for the expected shading effect, transforming the production instructions to account for the thickness-related optical effects.
2Shape
If laser is used to create thick images in substrate, then the image elements have significant depth, but laser diffusion in the substrate material causes additional blurring and degradation
Solution Approach 1:
The patent converts the harmful laser diffusion effect into a beneficial factor by modeling it within the transfer function. The system characterizes the diffusion behavior and incorporates it into the compensation algorithm, so that the production setpoint is adjusted to anticipate and counteract the diffusion effect, transforming a degradation mechanism into a predictable and compensable parameter.
Solution Approach 2:
The patent implements feedback by using the transfer function to predict the actual image appearance based on production parameters, comparing this prediction with the desired objective image, and then adjusting the production setpoint accordingly. This closed-loop approach allows the system to account for laser diffusion effects and other process variations.
3Manufacturing precision
If conventional printing methods are used, then shading effects are negligible, but the images lack thickness and tactile quality
Solution Approach 1:
The patent changes parameters by transitioning from conventional printing parameters to laser-based parameters that create thickness. The system models the optical effects specific to thick images (shading, diffusion) and adjusts production parameters accordingly, enabling the achievement of both thickness and acceptable brightness uniformity through compensated production instructions.
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
The method produces an image that closely resembles the desired objective image by reducing shading and diffusion effects, thereby improving the accuracy and clarity of the final image produced.
Implementation Method 1
the particles constituting the substrate which are burned diffuse. These diffusion effects of the laser in the substrate material
Data Source
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AI summary
Method for producing an objective image by means of an image production device capable of producing a juxtaposition of image elements (2) in a substrate (1) having a thickness and producing a thick image such that a shadow effect is produced for each image element (2) on the neighbouring image elements of same, comprising the following steps: - determining a production instruction from the objective image, - producing an image created by means of the image production device using said production instruction, where the determination step replaces the production instruction with an improved production instruction determined by the following steps: - modelling the image production device by a transfer function transforming a production instruction into a predicted image, - determining an improved production instruction for which the image predicted by the transfer function is as close as possible to the objective image, in such a way as to reduce the consequences of the shadow effect in the created image. Image produced by such a method. Image production device using such a method.