scaleDownUsingIntegralImage (can also scale up) [1019590]

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

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

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):

Created/modified:

2021-08-05 23:47:07

Source code size:

765 bytes / 19 lines

Pitched / IR pitched:

No / No

Views / Downloads:

686 / 860

Version history:

8 change(s)

Referenced in:

[show references]

1	static RGBImage scaleDownUsingIntegralImage(IIntegralImage img, int w) {
2	ret scaleDownUsingIntegralImage(img, w, heightForWidth(img.getWidth(), img.getHeight(), w));
3	}
4
5	static RGBImage scaleDownUsingIntegralImage(IIntegralImage img, int w, int h) {
6	int w1 = img.getWidth(), h1 = img.getHeight();
7	RGBImage out = new(w, h);
8	for y to h:
9	for x to w: {
10	int x1 = xw1/w, x2 = max(x1+1, (x+1)w1/w);
11	int y1 = yh1/h, y2 = max(y1+1, (y+1)h1/h);
12	int area = (x2-x1)*(y2-y1);
13	int r = roundedRatio(img.rectSum(x1, y1, x2, y2, 0), area);
14	int g = roundedRatio(img.rectSum(x1, y1, x2, y2, 1), area);
15	int b = roundedRatio(img.rectSum(x1, y1, x2, y2, 2), area);
16	out.setPixel(x, y, r, g, b);
17	}
18	ret out;
19	}