Imaging Guide Device Camera Alignment via Projection Distortion
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Solution Overview
Problem
Existing imaging guide systems face difficulties in adjusting the camera direction for matching images during individual authentication, especially when the original shape of the matching area is unknown or complex, such as a trapezoid, rhombus, or star shape, leading to challenges in aligning the camera directions between registration and matching phases.
Innovation Solution
An imaging guide device and method that computes a plane projection transformation matrix between first and second images, acquires a transformed figure, generates a tilt index representing the imaging direction tilt, and displays this information superimposed on the second image to assist in aligning the camera directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the original shape of the matching area is unknown or complex (trapezoid, rhombus, star shape), then the camera direction adjustment becomes difficult to estimate, but the authentication performance still needs to be maintained
Solution Approach 1:
The patent introduces a guide image as an intermediary visual aid that displays projected distortion information. This guide image serves as a mediator between the complex projection distortion problem and the user's camera adjustment task, making it easier to understand and correct directional misalignment without requiring knowledge of the original shape.
Solution Approach 2:
The patent uses color-coded indicators in the guide image to represent different types and degrees of projection distortion. By encoding distortion information through color variations, the system provides intuitive visual feedback that helps users quickly identify and correct camera direction issues, maintaining authentication reliability while simplifying operation.
2Reliability
If the camera direction at matching time differs from registration time, then projection distortion influences authentication performance, but adjusting the camera direction is not intuitive for users
Solution Approach 1:
The patent implements a feedback mechanism by displaying the guide image that shows the current projection distortion state. This visual feedback loop allows users to see the effect of their camera positioning in real-time, enabling intuitive adjustment without needing to understand the underlying projection distortion mathematics.
Solution Approach 2:
The patent segments the complex camera alignment problem into separate adjustable parameters (pan, tilt, roll) and displays corresponding distortion effects for each. This segmentation makes the adjustment process more manageable and intuitive, as users can focus on one parameter at a time while seeing its specific impact on the guide image.
Data Source
AI summary
An imaging guide device includes a computation means for computing a plane projection transformation matrix of a first image obtained by capturing a flat surface of an object with a first imaging device and a second image obtained by capturing the flat surface with a second imaging device; an acquisition means for acquiring a second figure obtained by transforming a first figure on the basis of the plane projection transformation matrix, the first figure being virtually drawn on the first image in a predetermined direction and a predetermined shape; a generation means for generating a tilt index representing a tilt in an imaging direction of the second imaging device with respect to the first imaging device on the basis of the second figure, and generating a display item including the tilt index; and a display control means for displaying the display item in a superimposed manner on the second image.