Illusion Image Generation via Orientation-Selective Wavelet Decomposition
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Solution Overview
Problem
There is no method for automatically generating illusion images from arbitrary images, as existing techniques rely on skilled discovery or specific patterns, and mathematical models like pinwheel framelets are used for analysis rather than generation.
Innovation Solution
An illusion image generating apparatus with a storing unit and control unit that performs multiresolution decomposition using wavelet frames or filterbanks with orientation selectivity, allowing for the attenuation or amplification of subband signals to create a floating illusion in reconstructed images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If conventional methods are used to create illusion images, then illusion effects can be achieved through specific patterns, but the process requires skilled discovery and cannot automatically generate illusion images from arbitrary images
Solution Approach 1:
The patent transforms the static pattern selection process into a dynamic parameter-based system. By changing the parameters of wavelet frame coefficients and applying orientation-selective filtering, the system automatically generates illusion effects from any input image without requiring pre-defined patterns or skilled manual design.
Solution Approach 2:
The patent replaces the manual, skill-based mechanical process of illusion figure creation with an automated computational system. The wavelet frame decomposition and reconstruction process substitutes the manual pattern design mechanism, enabling automatic generation of illusion images from arbitrary inputs.
2Loss of information
If pinwheel framelets are used for analyzing illusion creation, then understanding of illusion mechanisms is improved, but the method cannot generate illusion images from arbitrary images
Solution Approach 1:
The patent segments the image processing into distinct wavelet frame decomposition stages, separating the analysis function (understanding illusion mechanisms) from the synthesis function (generating illusion images). This segmentation allows the system to preserve original image information while automatically generating new illusion images through controlled reconstruction.
Solution Approach 2:
The patent extends the analysis from static pattern recognition to dynamic multi-dimensional wavelet frame processing. By operating in the wavelet domain with multiple scales and orientations, the system gains the capability to automatically generate illusion images while preserving the original image's essential information.
3Manufacturing precision
If all subband signals are reconstructed equally, then the original image is perfectly reconstructed, but no floating illusion effect is created
Solution Approach 1:
The patent applies local quality changes by selectively modifying specific wavelet frame coefficients during reconstruction. Instead of uniform reconstruction, the system adjusts the amplitude of coefficients corresponding to specific orientations and scales, creating localized changes that produce the floating illusion effect while maintaining overall image fidelity.
Solution Approach 2:
The patent introduces asymmetry in the reconstruction process by differentially weighting subband signals based on their orientation and scale. This asymmetric treatment of coefficients—enhancing some while suppressing others—creates the perceptual floating illusion while the underlying mathematical framework maintains reconstruction accuracy.
Data Source
AI summary
The present invention obtains subband signals by performing a multiresolution decomposition by a wavelet frame with orientation selectivity or a filterbank with orientation selectivity that is a set of an approximate filter with no orientation and a plurality of detail filters with respective orientations on image data, and, when an image is reconstructed by summing the obtained subband signals, generates reconstructed image data that creates a floating illusion by attenuating or amplifying a subband signal corresponding to at least one of detail filters with a predetermined orientation relative to a floating direction, in which an image is desired to be floated due to an illusion, among the detail filters.