Image Display Device Preventing Screenshot Restoration via Temporal Noise
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Solution Overview
Problem
Existing methods, such as those described in Patent Literature 1, can be circumvented by capturing screen shots to restore the original image by averaging first and second converted images, making it possible to obtain the original image data.
Innovation Solution
An image display device and method that generates multiple image sets with modified images, where each set includes images with pixel values averaged to match the original image, and displays these sets sequentially, making it difficult to restore the original image by screen shots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two converted images (first and second) are generated and displayed by switching at high speed, then it is possible to prevent fraudulent acquisition of original image data, but the original image can be restored by capturing screen shots to obtain the first and second converted images and averaging them
Solution Approach 1:
The original image is segmented into multiple modified images with different noise patterns. Each modified image contains only partial information about the original, making it impossible to restore the original from a single modified image. The segmentation is applied in the spatial domain by adding different noise patterns to different regions or the entire image.
Solution Approach 2:
The protection mechanism moves from the spatial domain to the temporal domain by rapidly switching between multiple modified images. Instead of displaying one modified image statically, the system displays multiple modified images in sequence, requiring temporal integration to reconstruct the original. This dimensional change from space to time prevents restoration from static screenshots.
2Object-affected harmful factors
If multiple modified images are generated with noise addition, then the original image cannot be easily restored from single screenshots, but multiple screenshots would be required to attempt restoration
Solution Approach 1:
The system employs periodic switching between multiple modified images at a frequency that creates a persistent visual illusion. The switching rate is optimized so that human visual perception integrates the rapidly changing images into a stable original appearance, while preventing screenshot capture of any single modified state. This periodic action ensures that any screenshot captures only a noisy, non-representative moment.
Solution Approach 2:
The display system transitions from static to dynamic by continuously changing the displayed modified image. The noise patterns and modified images are updated periodically, ensuring that the display state is always in transition. This dynamic behavior prevents fraudulent acquisition because screenshots capture only transient, non-representative states, while legitimate viewing benefits from the temporal integration effect.
Data Source
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AI summary
To make it difficult to obtain an original image based on display data. An image display device includes an image set generating unit (20) that generates a plurality of image sets S, each including a plurality of modified images Cj that are obtained by modifying an original image O, and an average of pixel values of corresponding pixels of the plurality of modified images Cj included in each of the image sets S corresponding to a value of a corresponding pixel of the original image O, and an image display unit (22) for sequentially displaying the plurality of modified images Cj included in each of the image sets S by sequentially using the plurality of image sets S generated by the image set generating unit (20).