Noninvasive optical imaging and spectroscopy for quantitative monitoring of the progression of oral premalignant lesions
Interim results are presented from a longitudinal study in which optical imaging and spectroscopy are used to monitor progression of oral premalignant lesions. A total of 447 sites in 120 patients were tracked over time.
Acquiring the NDVI time series curve with the temporal characteristics is the necessary steps for land use and vegetation cover change analysis. In order to use multi-source remote sensing data effectively,based on the theory of down scaling,this paper proposed the method which combines with high and low spatial resolution images of different time resolutions,uses linear mixed model to disaggregate the mixed pixels in coarse resolution images,calculates the sub-pixel reflectance of features,and produces the sub-pixel level NDVI time series curve of high temporal character. Thus it would be possible to dynamically analyze the land-use and vegetation biomass change in details by limited RS resources. Finally,the experimental result with real image data proved its feasibility.