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1 | // img must be square with width/height being a power of 2 |
2 | static BWContrastQuadTree bwImageContrastQuadtree(BWImage img) {
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3 | int w = img.getWidth(), h = img.getHeight(); |
4 | assertEquals("width/height", w, h);
|
5 | if (!isPowerOf2(w)) fail("image size not a power of 2: " + w);
|
6 | ret bwImageContrastQuadtree_make(img, 0, 0, w); |
7 | } |
8 | |
9 | static BWContrastQuadTree bwImageContrastQuadtree_make(BWImage img, int x, int y, int w) {
|
10 | if (w == 1) ret BWContrastQuadTree(img.getInt(x, y)); |
11 | |
12 | int r = w/2; |
13 | BWContrastQuadTree |
14 | a = bwImageContrastQuadtree_make(img, x, y, r), |
15 | b = bwImageContrastQuadtree_make(img, x+r, y, r), |
16 | c = bwImageContrastQuadtree_make(img, x, y+r, r), |
17 | d = bwImageContrastQuadtree_make(img, x+r, y+r, r); |
18 | |
19 | int min = intMin(a.min(), b.min(), c.min(), d.min()); |
20 | int max = intMax(a.max(), b.max(), c.max(), d.max()); |
21 | if (min == max) |
22 | ret BWContrastQuadTree(min, max); |
23 | |
24 | ret new BWContrastQuadTree.Composite(min, max, a, b, c, d); |
25 | } |
Began life as a copy of #1026931
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| Snippet ID: | #1026940 |
| Snippet name: | bwImageContrastQuadtree [OK for square images with side length power of 2] |
| Eternal ID of this version: | #1026940/10 |
| Text MD5: | 827723880b82cfd342e897da7e41f8a8 |
| Transpilation MD5: | 7316ab6cb054b2204b2e7473d66aa5e2 |
| Author: | stefan |
| Category: | javax / image analysis |
| Type: | JavaX fragment (include) |
| Public (visible to everyone): | Yes |
| Archived (hidden from active list): | No |
| Created/modified: | 2020-02-03 13:19:27 |
| Source code size: | 994 bytes / 25 lines |
| Pitched / IR pitched: | No / No |
| Views / Downloads: | 316 / 418 |
| Version history: | 9 change(s) |
| Referenced in: | [show references] |