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// from https://rosettacode.org/wiki/Zhang-Suen_thinning_algorithm#Java // each array element is one pixel (0 = background, anything else = foreground) srecord noeq ZhangSuenThinner_byteArray(int w, int h, byte[] pixels) { static final int[][] nbrs = {{0, -1}, {1, -1}, {1, 0}, {1, 1}, {0, 1}, {-1, 1}, {-1, 0}, {-1, -1}, {0, -1}}; static final int[][][] nbrGroups = { {{0, 2, 4}, {2, 4, 6}}, {{0, 2, 6}, {0, 4, 6}}}; new PtBuffer toWhite; run { bool firstStep; while ping (true) { firstStep = !firstStep; for (int r = 1; r < h - 1; r++) for (int c = 1; c < w - 1; c++) { if (!getPixel(c, r)) continue; int nn = numNeighbors(r, c); if (nn < 2 || nn > 6) continue; if (numTransitions(r, c) != 1) continue; if (!atLeastOneIsWhite(r, c, firstStep ? 0 : 1)) continue; toWhite.add(c, r); } if (!firstStep && empty(toWhite)) break; for (Pt p : toWhite) clearPixel(p.x, p.y); toWhite.clear(); } } int numNeighbors(int r, int c) { int count = 0; for (int i = 0; i < nbrs.length - 1; i++) if (getPixel(c + nbrs[i][0], r + nbrs[i][1])) count++; ret count; } int numTransitions(int r, int c) { int count = 0; for (int i = 0; i < nbrs.length - 1; i++) if (!getPixel(c + nbrs[i][0], r + nbrs[i][1]) && getPixel(c + nbrs[i+1][0], r + nbrs[i+1][1])) count++; ret count; } bool atLeastOneIsWhite(int r, int c, int step) { int count = 0; int[][] group = nbrGroups[step]; for (int i = 0; i < 2; i++) for (int j = 0; j < group[i].length; j++) { int[] nbr = nbrs[group[i][j]]; if (!getPixel(c + nbr[0], r + nbr[1])) { count++; break; } } ret count > 1; } bool getPixel(int x, int y) { ret pixels[y*w+x] != 0; } void clearPixel(int x, int y) { pixels[y*w+x] = 0; } }