Solar Radiation Spectrum Shadow Correction

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing image processing technologies face challenges in accurately correcting the fine gradation of shadows in observation images of ground surfaces, which hinders high-accuracy observation.

Innovation Solution

An image processing device and method that calculates a solar radiation spectrum based on observation images, components of the solar radiation spectrum, and estimated pure substance spectra, and converts the images to suppress shadow influence, using models like the Bird model to express solar radiation as direct and diffuse components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If classification-based shadow correction is used, then shadow regions can be corrected, but fine gradation of shadows cannot be corrected with high accuracy

Engineering Contradiction:

Improveshadow correction accuracyVSAvoidfine gradation information

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent changes the parameter from simple binary classification (shadow/non-shadow) to continuous solar radiation spectrum calculation. By computing the solar radiation spectrum for each pixel based on observation images and pure substance spectra, the system captures fine gradations in shadow thickness and intensity, enabling high-accuracy shadow correction while preserving subtle intensity variations.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If solar radiation spectrum calculation is performed for each pixel, then shadow correction accuracy is improved, but device complexity increases

Engineering Contradiction:

Improveshadow correction accuracyVSAvoidcalculation complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent performs preliminary action by pre-calculating and storing the solar radiation spectrum components and pure substance spectra before actual shadow correction. The system pre-processes the observation images to extract spectral information, which is then reused for correction, reducing real-time computational complexity while maintaining high accuracy.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces the solar radiation spectrum as an intermediary between the raw observation image and the corrected image. Instead of directly correcting shadows, the system first calculates the solar radiation spectrum for each pixel, which serves as a mediator that encodes shadow information, and then uses this spectrum to guide the correction process, simplifying the overall complexity.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS11519781B2Image processing device, image processing method, and recording medium

Publication Date: 2022.12.06 NEC CORP

AI summary

An image processing device 100 includes a calculation unit 110 for calculating a solar radiation spectrum in a given area on the ground surface on the basis of an observed image of the area, a solar radiation spectrum component of the area, and the spectrum of a pure substance estimated in the area, and a conversion unit 120 for converting the observed image on the basis of the calculated solar radiation spectrum.