Handheld Camera Concave Path Guidance for 3D Portrait Synthesis
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Solution Overview
Problem
Handheld digital image capture devices struggle to capture high-quality, 3D portrait images effectively, as users find it challenging to maintain the camera on a predetermined concave path centered on the subject's face, leading to suboptimal image capture and processing.
Innovation Solution
The device includes a user-selectable 'enhanced portrait' mode that detects the face using face-detection techniques, generates a face delimiter on the screen to guide the user, and captures a series of images while the user moves along a concave path, ensuring the optical axis remains focused on the subject, with optional features like automatic flash and adjustable depth of field for improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If users manually hold and move the camera along a predetermined concave path, then 3D portrait images can be captured, but it is difficult to maintain the camera's position and orientation accurately
Solution Approach 1:
The system provides real-time visual feedback by displaying a frame indicator that shows the user's current position relative to the desired concave path. The indicator moves relative to the frame delimiter to indicate deviations, allowing users to adjust their hand movement to stay on the predetermined path, thereby maintaining accurate camera positioning without requiring manual precision.
Solution Approach 2:
The patent introduces an intermediary computational system that processes the relationship between the frame delimiter, face position, and concave path. This intermediary calculates and displays the frame indicator position, mediating between the user's manual camera handling and the required precise positioning along the concave path.
2Manufacturing precision
If multiple images are captured at successive positions along the concave path, then enhanced 3D portrait quality is achieved, but the image capture and processing time increases
Solution Approach 1:
The system captures images at periodic intervals as the user moves the camera along the concave path. By capturing images at successive predetermined positions rather than continuously, the system achieves the necessary 3D portrait quality while limiting the total capture time to a manageable duration.
Solution Approach 2:
The system pre-determines the concave path and successive capture positions before image acquisition begins. The frame indicator is prepared and displayed in advance, allowing the user to follow a predetermined trajectory, which streamlines the capture process and reduces overall time compared to adaptive or post-processing positioning adjustments.
3Manufacturing precision
If the device provides real-time feedback on path deviation, then users can maintain accurate positioning, but the device complexity increases
Solution Approach 1:
The system creates a simplified visual copy of the spatial relationship by displaying the frame indicator as a graphical representation on the screen. This 2D copy conveys the 3D positioning information and deviation from the concave path without requiring complex mechanical or electronic feedback mechanisms, maintaining accuracy while minimizing device complexity.
Data Source
AI summary
A hand-held digital image capture device (digital camera) has a user-selectable mode in which upon engaging the mode the device detects a face in the field of view of the device and generates a face delimiter on a camera display screen, the delimiter surrounding the initial position of the image of a the face on the screen. The device is arranged to indicate thereafter to the user if the device departs from movement along a predetermined concave path P with the optical axis of the device pointing towards the face, such indication being made by movement of the image of the face relative to the delimiter. The camera captures and stores a plurality of images at successive positions along the concave path.