areIdentical static method

bool areIdentical(ImageHash a, ImageHash b, double threshold)

Compares hashes until threshold mismatch is exceeded. Used for fast comparison.

Implementation

static bool areIdentical(
  ImageHash a,
  ImageHash b,
  double threshold,
) {
  if (a.depth != b.depth ||
      a.length != b.length ||
      a.resolution != b.resolution) {
    throw const HashIncompatibilityException(
      message: 'Hash length mismatch',
    );
  }

  final int length = a.length;

  int notEqualCount = 0;
  for (int i = 0; i < length; i++) {
    if (a.hashList[i] != b.hashList[i]) {
      notEqualCount++;
    }
    final mismatchPercent = notEqualCount / length;
    final acceptablePercent = 1 - threshold;
    if (mismatchPercent > acceptablePercent) {
      return false;
    }
  }
  return true;
}