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< > BotCompany Repo | #1024652 // MinimumFilter

JavaX fragment (include) [tags: use-pretranspiled]

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// from http://www.jhlabs.com/ip/filters/download.html

/*
Copyright 2006 Jerry Huxtable

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

/**
 * A filter which replcaes each pixel by the mimimum of itself and its eight neightbours.
 */
sclass MinimumFilter extends WholeImageFilter {
  int hRadius;
  int vRadius;

  *() { this(1); }
  *(int radius) { hRadius = vRadius = radius; }
  *(int *hRadius, int *vRadius) {}
  
  protected int[] filterPixels( int width, int height, int[] inPixels, Rectangle transformedSpace ) {
    int index = 0;
    int[] outPixels = new int[width * height];
    int y1 = -vRadius/2, y2 = y1+vRadius;
    int x1 = -hRadius/2, x2 = x1+hRadius;

    for (int y = 0; y < height; y++) {
      for (int x = 0; x < width; x++) {
        int pixel = 0xffffffff;
        for (int dy = y1; dy <= y2; dy++) {
          int iy = y+dy;
          int ioffset;
          if (0 <= iy && iy < height) {
            ioffset = iy*width;
            for (int dx = x1; dx <= x2; dx++) {
              int ix = x+dx;
              if (0 <= ix && ix < width) {
                pixel = PixelUtils.combinePixels(pixel, inPixels[ioffset+ix], PixelUtils.MIN);
              }
            }
          }
        }
        outPixels[index++] = pixel;
      }
    }
    ret outPixels;
  }
}

Author comment

Began life as a copy of #1018734

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Travelled to 6 computer(s): bhatertpkbcr, mqqgnosmbjvj, pyentgdyhuwx, pzhvpgtvlbxg, tvejysmllsmz, vouqrxazstgt

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Snippet ID: #1024652
Snippet name: MinimumFilter
Eternal ID of this version: #1024652/4
Text MD5: d65d71d5b6e9135083afcd6dd1138c6a
Transpilation MD5: 8bad94a047079299a7b6c0627bca45d1
Author: stefan
Category: javax / imaging
Type: JavaX fragment (include)
Public (visible to everyone): Yes
Archived (hidden from active list): No
Created/modified: 2019-08-22 00:57:48
Source code size: 1824 bytes / 57 lines
Pitched / IR pitched: No / No
Views / Downloads: 178 / 577
Version history: 3 change(s)
Referenced in: [show references]