Low-cost dynamic real-time foveated imager

Area of Science:

• Optics and Photonics
• Imaging Systems
• Remote Sensing Technology

Background:

• Foveated imaging systems offer high-resolution local imaging within a wide field of view (FOV), crucial for applications like unmanned aerial vehicle (UAV) monitoring.
• Existing foveated systems are often costly or lack dynamic capabilities, hindering mass production and object tracking in industrial settings.

Purpose of the Study:

• To develop a low-cost, dynamic, real-time foveated imaging system suitable for widespread industrial and remote sensing applications.
• To overcome the limitations of existing foveated imaging systems, specifically their high cost and lack of dynamic field adjustment.

Main Methods:

• A microlens is integrated behind the first intermediary image plane to create a local high-magnification channel by modulating focal length.
• A two-axis translation stage dynamically scans the microlens, enabling real-time adjustments to the high-magnification imaging area.
• The system utilizes a single detector for both peripheral and foveated imaging channels, eliminating the need for post-image fusion and reducing complexity.

Main Results:

• The experimental system achieved a full FOV of 30° with a focal length of 25 mm and an entrance pupil diameter of 5 mm.
• The local high-magnification channel demonstrated a focal length of 35 mm and an FOV of 15°.
• Experimental results confirmed the system's effective performance, highlighting its low-cost and dynamic capabilities.

Conclusions:

• The proposed low-cost dynamic real-time foveated imaging system offers a viable solution for applications requiring adaptable high-resolution imaging.
• The system's design, utilizing a common aspherical lens and integrated microlens, significantly reduces cost and complexity.
• This innovation holds great potential for enhancing monitoring and remote sensing capabilities in UAVs and industrial applications.