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Add comment to distortion calculation

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The formula for calculating the distortion seems wrong but practically it seems to work slightly better
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magethle 2025-02-10 15:01:44 +01:00
parent 193990a0e1
commit bd2521cb8e
1 changed files with 2 additions and 0 deletions
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core/src/main/java/com/google/zxing/qrcode/detector/FinderPatternFinder.java
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@ -695,6 +695,8 @@ public class FinderPatternFinder {
// we need to check both two equal sides separately. // we need to check both two equal sides separately.
// The value of |c^2 - 2 * b^2| + |c^2 - 2 * a^2| increases as dissimilarity // The value of |c^2 - 2 * b^2| + |c^2 - 2 * a^2| increases as dissimilarity
// from isosceles right triangle. // from isosceles right triangle.
// Heuristically it seems that the following formula works better (although it's
// not clear any more why...)
double d = Math.abs(c - 2 * b) + Math.abs(c - 2 * a); double d = Math.abs(c - 2 * b) + Math.abs(c - 2 * a);
if (d < distortion) { if (d < distortion) {
distortion = d; distortion = d;