Contrast Constrained Aerothermal Radiation Correction
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Solution Overview
Problem
High-speed aircrafts face severe aerothermal heating due to airflow interaction with optical windows, leading to thermal radiation noise and degraded image quality, which existing correction methods poorly address, especially in high-frame-rate imaging systems requiring real-time performance.
Innovation Solution
A contrast-constrained aerothermal radiation correction method involving noise filtering, image-block division, contrast value analysis, and secondary correction to enhance image quality, reducing time consumption and improving signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional aerothermal radiation correction methods are used, then image quality is improved, but time consumption increases significantly
Solution Approach 1:
The patent divides the image into multiple blocks and processes each block separately using parallel computing. The correction algorithm segments the image data into manageable units that can be processed simultaneously, reducing overall computation time while maintaining correction quality for the entire image.
Solution Approach 2:
The patent performs preliminary filtering and preprocessing of the aerothermal radiation image before applying the main correction algorithm. By pre-processing the data to remove noise and enhance relevant features, the subsequent correction step requires less computation time while achieving the same quality improvement.
2Measurement precision
If noise filtering is applied in thermal radiation field estimation, then estimation accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent applies noise filtering selectively to specific regions of the image rather than the entire image. By identifying and filtering only the regions containing thermal radiation noise while leaving other regions unchanged, the method achieves accurate estimation without the computational overhead of processing the whole image.
Solution Approach 2:
The patent introduces an intermediate processing step that transforms the noisy thermal radiation image into a filtered version before estimation. This intermediary filtering operation simplifies the subsequent estimation process by removing distracting noise elements, making the overall system more manageable despite the added filtering step.
3Productivity
If high-frame-rate imaging is used, then real-time performance is improved, but aerothermal radiation noise increases
Solution Approach 1:
The patent implements a continuous correction process that operates in real-time alongside high-frame-rate imaging. The correction algorithm processes each frame as it is captured, continuously removing thermal radiation noise without interrupting the high-speed imaging sequence, thus maintaining both real-time performance and noise reduction.
Solution Approach 2:
The patent converts the harmful thermal radiation noise into useful information by analyzing its characteristics and using it to improve the correction algorithm. By studying the noise patterns generated by high-frame-rate imaging, the method adapts the filtering parameters to effectively remove this specific type of noise while preserving the actual scene information.
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 method effectively corrects aerothermal radiation effects, significantly improving image quality and reducing time consumption, while maintaining high real-time performance for high-frame-rate imaging systems.
Implementation Method 1
Within the boundary layer, the airflow layers with a large velocity gradient will have strong friction, converting kinetic energy of the airflow irreversibly into heat
Implementation Method 2
aerothermal heating
Implementation Method 3
The optical window is aerothermal-heated and hence in a severe aerothermal environment; as a result, it produces thermal radiation noise
Data Source
AI summary
Disclosed in the present invention is a contrast constrained aerothermal radiation correction method. By analyzing features of images at different intensities of aerothermal radiation, it has been discovered that the stronger the aerothermal radiation effect is, the smaller the image contrast becomes, and when thermal radiation correction is performed using a gradient fitting algorithm, it has been discovered that time consumption thereof grows exponentially with an increase in a degree of a fitting surface and with an increase in an image size. The present invention can rapidly and effectively restore an aerothermal radiation image, remarkably improving a signal to noise ratio and quality of the image.