Card Authentication Pixel Thinning for Moire Pattern Processing
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Solution Overview
Problem
Existing card identifying apparatuses face a processing speed bottleneck during authentication judgment due to the high data amount of moire patterns generated from microprint interference, leading to decreased efficiency in validating cards such as bills and coupons.
Innovation Solution
A card identifying apparatus that reads card information on a pixel basis, reduces the number of pixels in one direction through pixel thinning processing, and uses this reduced image data to identify card authenticity, thereby decreasing the data amount and enhancing processing speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If moire data is obtained by capturing all regions where confirmation pattern and hidden pattern interfere, then measurement precision of authentication is improved, but data amount increases and processing speed decreases
Solution Approach 1:
The patent segments the authentication process into two stages: first extracting only the moire pattern features from the interference of confirmation and hidden patterns, then comparing these extracted features against stored authentication data. This segmentation allows capturing essential authentication information without processing all raw pixel data, thereby maintaining measurement precision while improving processing speed.
Solution Approach 2:
The patent extracts only the necessary moire pattern information from the full image data. Instead of processing all captured regions containing interference patterns, the system extracts specific moire features (such as fringe patterns, frequency characteristics, or spatial distributions) that are sufficient for authentication judgment. This extraction approach reduces data amount while preserving authentication precision.
2Measurement precision
If full image data is captured for authentication judgment, then measurement precision is improved, but data amount increases leading to longer processing time
Solution Approach 1:
The patent applies partial action by capturing and processing only the essential moire pattern features rather than complete image data. The system performs sufficient action to extract authentication-critical information (moire fringes, interference patterns) without the excessive burden of processing all pixel data, achieving appropriate authentication accuracy with reduced processing time.
Solution Approach 2:
The patent performs preliminary extraction of moire pattern features before the actual authentication comparison. By pre-processing the image data to isolate and extract only the relevant moire characteristics (fringe patterns, spatial frequencies) before comparison with stored authentication templates, the system reduces subsequent processing time while maintaining authentication accuracy.
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 apparatus achieves faster authentication judgment by reducing the data amount and processing time through pixel thinning, improving the efficiency of card validation without the need for new hardware or increased costs.
Implementation Method 1
reading the information of this microfilm to compare with genuine data... by a photosensor
Implementation Method 2
it is carried out providing a microprint (extremely fine characters, pattern and the like)... which exhibits a specific pattern (moire fringes; moire pattern) by interference of light
Data Source
AI summary
A card identifying apparatus according to one embodiment of the invention has a light-receiving portion that reads a card on a pixel basis of a predetermined area as a unit including color information having brightness, RAM that stores image data comprised of a plurality of pixels read by the light-receiving portion, an image data thinning processing section that makes the number of read pixels lower in another direction than in one direction to vary the number of pixels of the image data when the reading means reads the card, and an judgment processing section that identifies authentication of the card based on the image data varied by the image data thinning processing section.