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static float bwImageSimilarityResized(BWImage a, BWImage b, float similarity) { int aw = a.w(), ah = a.h(); int bw = b.w(), bh = b.h(); int wp = max(aw, bw), hp = max(ah, bh); float ratio1 = ((float) aw)/ah, ratio2 = ((float) bw)/bh; float mismatch = ratio1/ratio2; if (mismatch < 1f) mismatch = 1f/mismatch; float factor = wp*hp/mismatch; // ratio mismatch punishment (greater mismatch => factor smaller => returned difference bigger) float maxError = (1f-similarity)*factor; float diff = 0; for (int y = 0; y < hp; y++) for (int x = 0; x < wp; x++) { diff += Math.abs( a.getPixel(x*aw/wp, y*ah/hp)- b.getPixel(x*bw/wp, y*bh/hp)); if (diff > maxError) ret similarity-0.001f; } ret 1f-diff/factor; }