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< > BotCompany Repo | #1019590 // scaleDownUsingIntegralImage (can also scale up)

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

Libraryless. Click here for Pure Java version (6758L/40K).

static RGBImage scaleDownUsingIntegralImage(IIntegralImage img, int w) {
  ret scaleDownUsingIntegralImage(img, w, heightForWidth(img.getWidth(), img.getHeight(), w));
}

static RGBImage scaleDownUsingIntegralImage(IIntegralImage img, int w, int h) {
  int w1 = img.getWidth(), h1 = img.getHeight();
  RGBImage out = new(w, h);
  for y to h:
    for x to w: {
      int x1 = x*w1/w, x2 = max(x1+1, (x+1)*w1/w);
      int y1 = y*h1/h, y2 = max(y1+1, (y+1)*h1/h);
      int area = (x2-x1)*(y2-y1);
      int r = roundedRatio(img.rectSum(x1, y1, x2, y2, 0), area);
      int g = roundedRatio(img.rectSum(x1, y1, x2, y2, 1), area);
      int b = roundedRatio(img.rectSum(x1, y1, x2, y2, 2), area);
      out.setPixel(x, y, r, g, b);
    }
  ret out;
}

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Snippet ID: #1019590
Snippet name: scaleDownUsingIntegralImage (can also scale up)
Eternal ID of this version: #1019590/9
Text MD5: dce7738bd59245a4f2de5e4e0f98e746
Transpilation MD5: ab41dd2af9b7fcfa9d44c5be3cfb74ba
Author: stefan
Category: javax / imaging
Type: JavaX fragment (include)
Public (visible to everyone): Yes
Archived (hidden from active list): No
Created/modified: 2021-08-05 23:47:07
Source code size: 765 bytes / 19 lines
Pitched / IR pitched: No / No
Views / Downloads: 279 / 377
Version history: 8 change(s)
Referenced in: [show references]