Fingerprint Image Generation Method for Memory Reduction
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Solution Overview
Problem
Current fingerprint recognition systems face inefficiencies due to high memory requirements and bandwidth usage caused by large fingerprint image data, leading to slow acquisition and data transfer processes.
Innovation Solution
The method involves generating and storing fingerprint images by capturing original data, then compressing subsequent images by calculating differences between successive images, and storing only the difference data, which reduces memory usage and bandwidth requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fingerprint images are stored at original data size to maintain image quality, then measurement precision is improved, but device complexity and memory requirements increase
Solution Approach 1:
The patent segments the storage requirement into two parts: original quality images are captured and processed, but only compressed difference data is stored in memory. The first image is stored at full quality while subsequent images are stored as differences from the first, dividing the storage burden and reducing overall memory requirements while maintaining reconstruction quality.
Solution Approach 2:
The patent changes the data representation parameter from storing complete images to storing difference values. By transforming the storage format from original image data to differential data, the memory requirements are reduced while the ability to reconstruct high-quality images is preserved through the difference calculation process.
2Measurement precision
If all fingerprint image data is transferred at full resolution, then measurement precision is improved, but loss of time and bandwidth requirements increase
Solution Approach 1:
The patent extracts only the essential difference information from subsequent fingerprint images rather than transferring complete image data. By taking out only the changing elements (differences from the first image), the data transfer time is reduced while the essential information needed for accurate fingerprint recognition is preserved.
3Measurement precision
If multiple fingerprint images are captured during exposure period to improve recognition accuracy, then measurement precision is improved, but device complexity and memory usage increase
Solution Approach 1:
The patent segments the storage requirement for multiple images into one full-quality image and multiple difference images. The first captured image is stored at full resolution, while subsequent images during the exposure period are stored only as differences from the first image, reducing total memory usage while maintaining the ability to perform multiple captures for improved recognition accuracy.
Solution Approach 2:
The patent changes the storage parameter from full-resolution images to differential data for subsequent captures. This parameter transformation allows multiple images to be captured during the exposure period for improved recognition accuracy while significantly reducing the memory resources required to store them.
Data Source
AI summary
A method and device of fingerprint image generation for saving memory. The method includes generating a first fingerprint image of an original data size according to a plurality of first analog sensing signals which are read from a fingerprint sensor array before an exposure period ends. Then the first fingerprint image represented by a first data size which is equivalent to or smaller than the original data size is stored. a second fingerprint image of the original data size is generated after generating the first fingerprint image of the original data size according to a plurality of second analog sensing signals which are read from the fingerprint sensor array during the exposure period. The second fingerprint image represented by a compressed data size smaller than the original data size is then stored.