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1 | static BWImage scaleDownUsingIntegralImageBW(int w, BWIntegralImage img) {
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2 | ret scaleDownUsingIntegralImageBW(img, w); |
3 | } |
4 | |
5 | static BWImage scaleDownUsingIntegralImageBW(BWIntegralImage img, int w) {
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6 | ret scaleDownUsingIntegralImageBW(img, w, iround(w*img.h/(double) img.w)); |
7 | } |
8 | |
9 | static BWImage scaleDownUsingIntegralImageBW(BWIntegralImage img, int w, int h) {
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10 | int w1 = img.w, h1 = img.h; |
11 | BWImage out = new(w, h); |
12 | for y to h: |
13 | for x to w: {
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14 | int x1 = x*w1/w, x2 = max(x1+1, (x+1)*w1/w); |
15 | int y1 = y*h1/h, y2 = max(y1+1, (y+1)*h1/h); |
16 | int area = (x2-x1)*(y2-y1); |
17 | int pixel = bwIntegralImage_sumRect(img, x1, y1, x2, y2)/area; |
18 | out.setByte(x, y, (byte) pixel); |
19 | } |
20 | ret out; |
21 | } |
22 | |
23 | static BWImage scaleDownUsingIntegralImageBW(IBWIntegralImage img, int w, int h default iround(w*img.getHeight()/(double) img.getWidth())) {
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24 | int w1 = img.getWidth(), h1 = img.getHeight(); |
25 | BWImage out = new(w, h); |
26 | for y to h: |
27 | for x to w: {
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28 | int x1 = x*w1/w, x2 = max(x1+1, (x+1)*w1/w); |
29 | int y1 = y*h1/h, y2 = max(y1+1, (y+1)*h1/h); |
30 | int area = (x2-x1)*(y2-y1); |
31 | int pixel = bwIntegralImage_sumRect(img, x1, y1, x2, y2)/area; |
32 | out.setByte(x, y, (byte) pixel); |
33 | } |
34 | ret out; |
35 | } |
Began life as a copy of #1019590
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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: | 404 / 544 |
| Version history: | 10 change(s) |
| Referenced in: | [show references] |