Ghost Imaging Noise Cancellation via Complementary Light Patterns
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Solution Overview
Problem
Ghost imaging techniques suffer from noise degradation in reconstructed images due to random noise input during multiple irradiations of reference light, leading to inconsistent image quality.
Innovation Solution
Irradiating first and second reference lights with complementary intensity distributions, and performing separate correlation calculations for each to cancel common noise components and enhance image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference light is irradiated M times to obtain correlation for ghost imaging, then a reconstructed image can be obtained, but noise is input to the photodetector during multiple irradiations which degrades image quality
Solution Approach 1:
The patent divides the reference light into two separate beams with complementary intensity distributions. By segmenting the illumination into distinct beams rather than using a single random pattern, the system can process correlations separately and combine results to reduce noise impact on the reconstructed image quality.
2Adaptability or versatility
If the pattern of reference light is changed at random, then ghost imaging can be performed, but image quality becomes inconsistent depending on the random pattern used
Solution Approach 1:
The patent employs asymmetric complementary intensity distributions for the two reference light beams rather than symmetric random patterns. This asymmetric design ensures that the correlation calculations from both beams provide consistent and complementary information, improving image quality consistency while maintaining the adaptability of the ghost imaging technique.
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
The approach results in improved image quality by canceling noise components, providing a more stable and clear reconstructed image through combined correlation calculations.
Implementation Method 1
a digital micromirror device (DMD) including multiple micromirrors that correspond to multiple pixels, and each structured to be tilted independently around a hinge axis in a first direction and a second direction
Data Source
AI summary
An illumination apparatus irradiates first reference light having a first intensity distribution and second reference light having a second intensity distribution that has a complementary relation with the first intensity distribution. A photodetector measures reflected light from an object. A processing device executes a first correlation calculation using a first detection intensity based on the output of the photodetector in a state in which the first reference light is irradiated and the second intensity distribution, and executes a second correlation calculation using a second detection intensity based on the output of the photodetector in a state in which the second reference light is irradiated and the second intensity distribution.