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Dr. Jinghui Yang is invited to make a keynote presentation in an conference

 Sept. 21, 2017, the founder of VisionOnSky Co., Ltd, Dr. Jinghui Yang was invited to make a keynote presentation titled as “Pansharpening: Model, Algorithm and Computation from Our Perspective” in the IWIDF 2017 workshop, part of ISPRS Geospatial Week 2017, which is held in Wuhan.   

 In this presentation, Dr. Jinghui Yang has given some insights and innovative work about model, algorithm and computation of pansharpening from their perspective. Model: On the basis of the analysis and mathematical deduction for three general categories, a generalized model for satellite image pansharpening is presented. The model can express the relationship between the sharpened higher resolution multispectral image and the original multispectral image, the spatial details extracted from the higher resolution panchromatic image and the adopted fusion strategies by a simple mathematical formula. The more general model can characterize most commonly used pansharpening algorithms. Algorithm: An innovative pansharpening algorithm named BR (block regression based algorithm) is presented. BR has the capacity of adjustment, which can result in different emphases between preservation of spectral characteristic and enhancement of spatial details according to the users’ requirements. It can also achieve a satisfying trade-off between preservation of spectral characteristic and enhancement of spatial details by optimal selection of block size. Compared to five pansharpening algorithms, BR is stable in pansharpened effects for optical satellite image fusion. Computation: A parallel computing paradigm combining the generalized model and a multi-core computer, which can be applied to implementation of most algorithms and can achieve high performance, is presented for pansharpening algorithms. The effective integration of the generalized fusion model and a multi-core computer not only yields high speedups but also efficiently leverages the computational resources in a multi-core computer.   

 In Q&A, Dr. Jinghui Yang has deeply discussed some issues with audiences.  





Background of pansharpening

In general, the panchromatic and multispectral images covering the same area are acquired by satellite. Using pansharpening technology, the structural and textural details of the lower resolution multispectral image are enhanced by adopting the higher resolution panchromatic image, thus a higher resolution image with spectral contents is generated. Pansharpening is an important step in the processing workflow of satellite imagery, which is extensively applied to visual interpretation, automatic classification, information extraction, feature enhancement, display of 3D scene, generation of ortho-rectified image, change detection, and image based mapping.


You can also find the introduction of the keynote speech in the official website of the conference:



More information, please access our website: www.VisionOnSky.com




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