User Manual - pancroma

around 4000 rows by 4000 columns. It may require long processing timeshowever.This algorithm is normally used in combination with the Laplacian or Thin Plateinterpolation methods (or both). The Iterative solver converges on a solution(assuming it does converge) much faster when it starts with a good estimate ofthe solution vector. Such a solution can be obtained by first running theLaplacian solver for example, and using the solution to this interpolation as thestarting point for the Iterative solver.When pan sharpening, access the Iterative selection check box by checking the‘Activate Image Processing Routines’ check box on the Main Window. When theImage Processing Data Input screen becomes visible, check the ‘Iterative’ radiobutton. Also check the Laplacian and/or Thin Plate check boxes as well. Enterthe desired number of iterations. It is best to start with a 10X ratio betweenLaplacian/Thin Plate iterations and Iterative iterations, as Laplacian and ThinPlate are much more computationally expensive than the Iterative solver. Whenyou press ‘Process Image’ your pan sharpened image will be computed usingIterative interpolation.A fourth interpolation method is the bilinear algorithm. This algorithm is alsoefficient at reaching beyond adjacent pixels for interpolation information. It ismuch faster and uses less RAM resources than the Iterative solver. In order touse this algorithm, check the ‘Bilinear’ radio button on the Image ProcessingData Input screen. Since this is not an iterative method, no iterations need beinput. This algorithm is often more effective than either of the Laplacianalgorithms for 4X and 6X interpolations.IMPORTANT NOTE: When interpolating using the bilinear method and XIONGpan sharpening, the Laplacian check box will be checked and you will have theoption to input Laplacian iterations. This is for the NIR band interpolation that isused for XIONG. The default number is 40, which you can increase or decreaseto get a better NIR band interpolation. See Section 25 on the XIONG method formore information.55