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< > BotCompany Repo | #1019597 - scaleDownUsingIntegralImageBW (can also scale up)

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

Libraryless. Click here for Pure Java version (6186L/37K).

static BWImage scaleDownUsingIntegralImageBW(int w, BWIntegralImage img) {
  ret scaleDownUsingIntegralImageBW(img, w);
}

static BWImage scaleDownUsingIntegralImageBW(BWIntegralImage img, int w) {
  ret scaleDownUsingIntegralImageBW(img, w, iround(w*img.h/(double) img.w));
}

static BWImage scaleDownUsingIntegralImageBW(BWIntegralImage img, int w, int h) {
  int w1 = img.w, h1 = img.h;
  BWImage 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 pixel = bwIntegralImage_sumRect(img, x1, y1, x2, y2)/area;
      out.setByte(x, y, (byte) pixel);
    }
  ret out;
}

static BWImage scaleDownUsingIntegralImageBW(IBWIntegralImage img, int w, int h default iround(w*img.getHeight()/(double) img.getWidth())) {
  int w1 = img.getWidth(), h1 = img.getHeight();
  BWImage 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 pixel = bwIntegralImage_sumRect(img, x1, y1, x2, y2)/area;
      out.setByte(x, y, (byte) pixel);
    }
  ret out;
}

Author comment

Began life as a copy of #1019590

download  show line numbers  debug dex   

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Snippet ID: #1019597
Snippet name: scaleDownUsingIntegralImageBW (can also scale up)
Eternal ID of this version: #1019597/11
Text MD5: ea99cc2c8a471c0be393a37c3c2951b4
Transpilation MD5: fc03f30d392c4cf8b540295c73dea3a4
Author: stefan
Category: javax / imaging
Type: JavaX fragment (include)
Public (visible to everyone): Yes
Archived (hidden from active list): No
Created/modified: 2021-01-06 18:28:50
Source code size: 1258 bytes / 35 lines
Pitched / IR pitched: No / No
Views / Downloads: 167 / 222
Version history: 10 change(s)
Referenced in: [show references]

Formerly at http://tinybrain.de/1019597 & http://1019597.tinybrain.de