Method and device for colour correction of a plurality of georeferenced images
The multi-grid size approach iteratively refines colour values to address inconsistencies in geo-referenced images, achieving seamless transitions and accurate colour balance for high-quality mosaics.
WO2026131652A1PCT designated stage Publication Date: 2026-06-25FNV IP BV
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- FNV IP BV
- Filing Date
- 2025-12-15
- Publication Date
- 2026-06-25
AI Technical Summary
Technical Problem
Traditional colour correction methods for geo-referenced images struggle with inconsistencies and artifacts, particularly in diverse terrain types and varying light conditions, leading to visually patchy mosaics and poor quality outputs.
Method used
A multi-grid size approach iteratively refines colour values across varying scales using starting and intermediate grids, employing statistical averaging and gamma correction to ensure seamless transitions and accurate colour balance.
Benefits of technology
The method effectively corrects colour inconsistencies across large and small scales, preserving local details and ensuring uniform colour representation, suitable for applications like mapping and environmental monitoring.
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Smart Images
Figure EP2025087114_25062026_PF_FP_ABST
Abstract
A method for colour correction of a plurality of geo-referenced images is disclosed. The method is performed by a processor and comprises: deriving, for each of the plurality of geo-referenced images, colour values of cells of a starting colour grid obtained by resampling the geo-referenced image using a specific cell size larger than an original resolution of the georeferenced image; iteratively refining colour values of cells of all derived starting colour grids through one or more intermediate grids with progressively smaller intermediate cell sizes, by the following steps: obtain, for each starting colour grid, an intermediate grid by resampling the starting colour grid using an intermediate cell size larger than the specific cell size of the starting colour grid; deriving, an intermediate target colour value for each intermediate grid cell of all intermediate grids, by calculating mean colour values of all starting colour grid cells included in the respective intermediate grid cell; correcting the colour values of the cells of all starting colour grids based on the corresponding intermediate target colour values, wherein the corrected colour values of the cells of the starting colour grids obtained in a previous intermediate grid is used for a following intermediate grid; and correcting pixel values of the plurality of geo-referenced images using the refined colour values of the cells of the starting colour grids after the final iteration. Unlocking insights from Geo-Data, the present invention further relates to improvements in sustainability and environmental developments: together we create a safe and liveable world.
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