Abstract
The complex process of fully automatically establishing seamlines for the fast production of high-quality mosaics with high-amount of high-resolution multi-spectral images is detailed and improved in this paper. The algorithm is analyzed and a quasi-linear runtime in the number of considered pixels is proven for all situations. For typical situations the storage is even essentially smaller from a complexity theoretical perspective. Improvements from algorithm practical perspective are specified, too. The influence of different methods for the determination of seamlines based on gradients is investigated in detail for three Sentinel-2 products. The studied techniques cover well-known ones normally based on a single band. But also more sophisticated techniques based on multiple bands or even taking additional external geo-information data are taken into account. Based on the results a larger area covered by Image2006 orthorectified products with data of the Resourcesat-1 mission is regarded. The feasibility of applying advanced subordinated methods for improving the mosaic such as radiometric harmonization is examined. This also illustrates the robustness of the improved seamline determination approaches.
Highlights
The quality of the image mosaic is probably strongest influenced by the gradient images used for seamline estimation
We propose and analyze an algorithm for image mosaicking of highresolution orthorectified products based on morphological image processing which is especially fully automatic and highly efficient with a quasi-linear runtime
Right) Three overlapping S2 scenes used for experiment, further experiments were carried out using Landsat 8, SPOT 5, Resourcesat, etc
Summary
The quality of the image mosaic is probably strongest influenced by the gradient images used for seamline estimation. We propose and analyze an algorithm for image mosaicking of highresolution orthorectified products based on morphological image processing which is especially fully automatic and highly efficient with a quasi-linear ( called log-linear) runtime. Such a runtime is a key factor for the timely provision of European or global mosaics.
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