Lensless Imaging Fresnel Zone Plate Phase Segmentation
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Solution Overview
Problem
Current lensless imaging technologies using Fresnel zone plates face challenges in achieving high image quality due to noise components and restricted design parameters, limiting the angle of view and image sensor configurations.
Innovation Solution
The implementation of a two-dimensional complex Fourier transformation using Fresnel zone plates with different phases in each region, allowing for the generation of a complex image from projected images, which reduces noise and enhances image quality while providing a wide angle of view without the need for lens-based systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a Fresnel zone plate is used in lensless imaging, then the angle of view can be widened, but noise components increase and image quality deteriorates
Solution Approach 1:
The patent divides the imaging system into multiple imaging units, each with its own Fresnel zone plate and image sensor. By segmenting the imaging function across multiple units with different phase configurations, the system achieves both wide angle of view and high image quality through combined processing of multiple projected images.
2Device complexity
If traditional lensless imaging methods are used, then device complexity is reduced, but design parameters are restricted
Solution Approach 1:
The patent applies local quality by assigning different phases to different regions of the Fresnel zone plate. Each region of the zone plate has optimized local characteristics that contribute to overall image quality while maintaining the simplicity of the lensless imaging approach. This allows flexible design parameters without increasing device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables the acquisition of high-quality images with reduced noise and increased flexibility in design parameters, allowing for a wider angle of view and improved image reconstruction without the limitations of traditional lens-based systems.
Implementation Method 1
Fresnel zone plate on which light from a subject is incident
Implementation Method 2
reconstructs an image of a spatial domain by performing two-dimensional complex Fourier transformation on a complex image
Data Source
AI summary
Provided an imaging system, an imaging apparatus and an image processing apparatus constituting the imaging system, an image processing method used in the image processing apparatus, and a non-transitory recording medium for causing a computer to implement the image processing method. According to the imaging apparatus according to one aspect of the present invention, an image of high image quality can be acquired (reconstructed) in the imaging system configured to include the imaging apparatus by acquiring first and second projected images using Fresnel zone plates having different phases of local spatial frequencies. In addition, the design parameters (pitches and the areas of the Fresnel zone plates, the number of pixels of image sensors, a distance between the Fresnel zone plates and the image sensors, and the like) can be selected without considering an effect of a noise component, and the number of restrictions on the design parameters is small.