Fingerprint Image Resolution Recognition Using Scale Pilot Wires
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Solution Overview
Problem
In fingerprint collation, images with poorly photographed scales can lead to errors in cutting out the standard resolution, affecting collation accuracy due to the lack of consistent resolution information.
Innovation Solution
An image resolution recognition device and method that sets starting and passing points on a scale within a fingerprint image, calculates inter-division distance, and displays a frame corresponding to the standard resolution, ensuring accurate representation and cutting out of the standard resolution size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a scale is photographed together with the remaining fingerprint to provide resolution information, then resolution reference is available, but the scale may not be photographed well enough leading to errors in standard resolution size
Solution Approach 1:
The patent introduces an intermediary processing system that mediates between the photographed scale and the fingerprint image. The system detects the scale's position and length in the photographed image, then uses this information to calculate and mark the standard resolution size on the fingerprint image. This intermediary processing step ensures that even if the scale is not perfectly photographed, the resolution information can be accurately extracted and applied.
Solution Approach 2:
The patent replaces the mechanical/manual method of physically ensuring proper scale placement with an automated image processing system. Instead of relying on physical photography quality, the system uses computer vision algorithms to detect the scale's position and length, calculate the standard resolution, and automatically mark the fingerprint image. This substitution of mechanical precision with computational processing resolves the reliability issue.
2Adaptability or versatility
If different people take photographs using different cameras, then fingerprint images can be collected from various sources, but the images are registered in dispersed states with different resolutions
Solution Approach 1:
The patent creates a universal processing system that can handle fingerprint images from multiple sources and different cameras. The system universally applies the scale-based resolution detection and marking process to all input images, regardless of their origin. By making the processing method universal rather than source-specific, the system achieves both adaptability to various image sources and consistency in resolution standardization.
Solution Approach 2:
The patent changes the resolution parameter of the fingerprint image by detecting the scale's length in the photographed image and calculating the corresponding standard resolution size. The system then marks the fingerprint image with this calculated size, effectively transforming images from dispersed resolution states to a unified standard resolution. This parameter transformation resolves the inconsistency while preserving the ability to accept images from various sources.
3Measurement precision
If the scale is not photographed well enough, then resolution reference is compromised, but requiring perfect scale photography increases operational complexity
Solution Approach 1:
The patent performs preliminary detection of the scale's position and length in the photographed image before proceeding to mark the standard resolution. By detecting the scale information first and using it to calculate the resolution parameters in advance, the system can tolerate certain degrees of imperfection in the scale photography while still achieving accurate resolution standardization. This preliminary action reduces the stringency requirements for the photography operation.
Data Source
AI summary
To accurately show the size of a standard resolution on an image of a fingerprint. A device comprises: a starting point setting unit (12) which, according to a starting point specification instruction that is input on a scale included in a fingerprint image, sets a starting point on a pilot wire that is specified first by the starting point specification instruction out of pilot wires of divisions on the scale; a passage point setting unit (13) which, every time an input line that is drawn along the scale from the starting point passes a pilot wire, sets a passage point on the passed pilot wire; an inter-division distance calculation unit (14) which calculates an inter-division distance on the image using the position of the starting point and the position of the passage point; a standard resolution calculation unit (15) which calculates the size of a standard resolution that corresponds to the image using the inter-division distance and a unit length which is the length of one division in the scale; and a frame display unit (16) which displays a frame on the image so as to match the size in the standard resolution.