Head-Mounted Display Depth Control Using Moving Image Source Planes
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Solution Overview
Problem
Existing virtual reality technologies lack effective solutions for dynamically adjusting the depth positions of virtual images to enhance depth perception, leading to potential visual fatigue due to vergence-accommodation conflict.
Innovation Solution
An image display control method for a head-mounted display device that determines a displacement sequence and source image display sequence based on a virtual scene's depth range, cyclically moving an image source apparatus to target positions and projecting corresponding source images to achieve dynamic display on virtual scene depth planes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If image data is transmitted and displayed in real-time from a remote location, then the user can view images captured by the imaging device, but transmission errors may occur causing degradation of image quality or loss of image data
Solution Approach 1:
The patent applies preliminary action by generating and storing hash values of image data before transmission. This allows for error detection and correction during transmission without requiring retransmission of the entire image data, thus preventing image data loss while maintaining transmission reliability.
Solution Approach 2:
The patent implements feedback mechanisms where hash values are transmitted alongside image data, and the receiving device compares received hash values with original hash values to detect transmission errors. This feedback loop enables real-time error detection and correction, ensuring reliable image transmission while preventing data loss.
2Reliability
If error correction codes are used to ensure accurate image transmission, then image quality is maintained, but the amount of data to be transmitted increases
Solution Approach 1:
The patent extracts only the essential error detection information (hash values) from the complete error correction process. By transmitting only hash values rather than full error correction codes, the system maintains image transmission accuracy while significantly reducing the additional data volume required.
Solution Approach 2:
The patent changes the parameter of error correction from traditional redundant data transmission to hash-based verification. This parameter change allows for accurate image transmission with minimal additional data, as hash values are computationally efficient and require far less bandwidth than conventional error correction codes.
3Reliability
If processing is performed to correct transmission errors, then image data integrity is maintained, but the load on the image processing device increases
Solution Approach 1:
The patent introduces hash values as an intermediary element between the imaging device and the image processing device. This intermediary enables error detection and correction with minimal processing requirements, as hash comparison is computationally simpler than traditional error correction algorithms, thus maintaining data integrity while reducing device load.
Data Source
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Figure 2B~2D
Figure 2E~3
AI summary
An image display control method and apparatus, and a head-mounted display device (200). The head-mounted display device (200) includes an optical imaging apparatus (210), an image source apparatus (230), a displacement apparatus (220) and an image display control apparatus (240). The image source apparatus (230) is optically aligned with the optical imaging apparatus (210), and has a plurality of source images. Each source image has a different virtual scene depth. The image display control method includes: determining a displacement sequence of a displacement apparatus (220) and a source image display sequence (610) of an image source apparatus (230), based on a virtual scene display depth range; controlling the displacement apparatus (220) to move, according to the displacement sequence, the image source apparatus (230) to corresponding target positions (620); and after the image source apparatus (230) reaches each of the target positions, controlling, according to the source image display sequence, the image source apparatus (230) to perform source image projection, so as to display a clear virtual image of a source image, corresponding to the target position, in the source image display sequence (630). By using the method, dynamic display of virtual images on virtual scene depth planes can be achieved.