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L2 img rest gcpsn co registration

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Jomo Kenyatta University of Agriculture and Technology JKUAT
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Digital Image Processing -Image Restoration 1 Ground Control Points and Co-registration Objectives ➢ Introduction ➢ Ground Control Points (GCPS) ➢ Co-Registration ➢ Resampling Introduction ➢ Rectification of systematic and non systematic geometric errors essential ➢ Ground control points (GCP) helps to register images to world coordinates GCPs ➢ A point whose position can be determined on the uncorrected image (row and column) and also on the geo-referenced data set or image (latitude, longitude or grid coordinates) ➢ Properties of GCP a. Should represent a prominent feature not likely to change for a long duration of time. b. Well distributed c. Optimum number selected depending on area to be represented. GCP (a) Insufficient ground control points to yield a good rectification (b) Poor distribution of ground control points to yield a good rectification (c) Good rectification because of use of large number of evenly distributed ground control points Co-Registration 6 ➢ Polynomial Transformation – used to rectify an unrectified image Co-Registration (a) Rectification process. Unrectified image is tied down to a map or rectified image and the polynomials calculated. The unrectified image is then transformed using the polynomial equations, (b) Graphical expression of root mean square error. In this instance groundcontrol point 6 appears to be in error, possibly due to an inaccurate tie-down or the input of incorrect coordinates Image R ...
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