Examples of WarpGrid

javax.media.jai.WarpGrid

A regular grid-based description of an image warp.

The mapping from destination pixels to source positions is described by bilinear interpolation within a rectilinear grid of points with known mappings.

Given a destination pixel coordinate (x, y) that lies within a cell having corners at (x0, y0), (x1, y0), (x0, y1) and (x1, y1), with source coordinates defined at each respective corner equal to (sx0, sy0), (sx1, sy1), (sx2, sy2) and (sx3, sy3), the source position (sx, sy) that maps onto (x, y) is given by the formulas:

 xfrac = (x - x0)/(x1 - x0) yfrac = (y - y0)/(y1 - y0) s = sx0 + (sx1 - sx0)*xfrac t = sy0 + (sy1 - sy0)*xfrac u = sx2 + (sx3 - sx2)*xfrac v = sy2 + (sy3 - sy2)*xfrac sx = s + (u - s)*yfrac sy = t + (v - t)*yfrac

In other words, the source x and y values are interpolated horizontally along the top and bottom edges of the grid cell, and the results are interpolated vertically:

 (x0, y0) ->            (x1, y0) -> (sx0, sy0)             (sx1, sy1) +------------+---------+ |            |\        | |            | (s, t)  | |            |         | |            |         | |            |         | |            |         | | (x, y) ->  |         | |  (sx, sy)--+         | |            |         | |            |         | |            | (u, v)  | |            |/        | +------------+---------+ (x0, y1) ->          (x1, y1) -> (sx2, sy2)           (sx3, sy3)

Points outside the bounds of the cells defining the grid warp will be mapped to the source image using the identity transformation.

WarpGrid is marked final so that it may be more easily inlined.

railo.runtime.img.filter.WarpGrid

A warp grid. From "A simplified approach to Image Processing" by Randy Crane

                dumpPropertyFile(warpPositions, "transformed");
            }
            
            LOGGER.log(Level.FINE, "Optimizing the warp into an grid warp {0} x {1}", new Object[] {rows, cols});
            
            return new WarpGrid((int) minx, stepx, cols, (int) miny, stepy, rows, warpPositions);
        }
    }

        if(operation != null) {
            properties.put(Resample.OPERATION, operation);
            if(warp != null) {
                properties.put(Resample.WARP_TYPE, warp.getClass());
                if(warp instanceof WarpGrid) {
                    WarpGrid grid = (WarpGrid) warp;
                    Dimension dimension = new Dimension(grid.getXNumCells(), grid.getYNumCells());
                    properties.put(Resample.GRID_DIMENSIONS, dimension);
                }
            }
        }
        /*

import railo.runtime.op.Caster;


public class ImageFilterWarpGrid {
  
  public static Object call(PageContext pc, double rows, double cols, double width, double height) {
    return new WarpGrid(Caster.toIntValue(rows), Caster.toIntValue(cols), Caster.toIntValue(width), Caster.toIntValue(height));
  }

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Examples of WarpGrid

Examples of javax.media.jai.WarpGrid

Examples of javax.media.jai.WarpGrid

Examples of railo.runtime.img.filter.WarpGrid