Noise Reduction Apparatus for Pan-Sharpened Images
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Solution Overview
Problem
Existing noise reduction methods can impair signal components of images created by pan-sharpen processing, particularly when dealing with images captured at different resolutions, as they assume noise characteristics and may mistakenly reduce signal components.
Innovation Solution
A noise reduction apparatus and method that performs multiresolution decomposition on a high-resolution image and compensates low-resolution components using a simultaneously captured low-resolution image, reconfiguring the high-resolution image to reduce noise while preserving signal components, utilizing techniques like Wavelet transformation and weighted-averaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If noise reduction processing is performed on a single image using conventional methods, then noise components are reduced, but signal components may be mistakenly reduced and impaired
Solution Approach 1:
The patent combines multiple images (first image and second image captured simultaneously) to perform noise reduction. By merging information from multiple images with different resolutions, the system can distinguish between noise and signal components more effectively, reducing noise while preserving signal integrity.
Solution Approach 2:
The patent applies multiresolution decomposition to segment the first image into multiple frequency components. This segmentation allows selective processing where noise reduction is applied to appropriate frequency bands while preserving signal components in other bands.
2Object-affected harmful factors
If noise reduction is performed on images captured at different resolutions, then noise can be reduced, but there is a risk of impairing original signal components
Solution Approach 1:
The patent applies different processing strategies to different resolution levels and frequency components. By adapting the noise reduction approach to local characteristics of each image and frequency band, the system achieves effective noise reduction while preserving signal components with varying spatial frequencies.
3Productivity
If conventional noise reduction methods are used on pan-sharpened images, then processing can be completed, but signal components may be damaged
Solution Approach 1:
The patent performs noise reduction processing on images before or during the pan-sharpening process. By addressing noise early in the processing pipeline, the system prevents noise from interfering with subsequent signal extraction and image fusion operations, thereby preserving signal components while maintaining processing efficiency.
Data Source
AI summary
In order to reduce the possibility of damaging a signal component of the original image during the noise reduction of an image created by pan-sharpen processing or the like based on a plurality of images of the same image object, which are taken simultaneously with different resolutions, a noise reduction apparatus according to the present invention includes a multiresolution decomposition means that performs multiresolution decomposition on a first image inputted to obtain components having a prescribed first resolution, the first image having a prescribed resolution, the prescribed first resolution being lower than the prescribed resolution of a second image inputted, the second image being captured simultaneously with the first image, the first image and the second image being images of a same object, a low resolution component compensation means that compensates at least one decomposition component created by the decomposition with use of the second image, and an image reconfiguration means that replaces the component decomposed with a decomposition component created by the compensation, reconfigures the first image, and outputs the first image thus reconfigured.