Class MaskUtil


  • final class MaskUtil
    extends java.lang.Object
    • Field Summary

      Fields 
      Modifier and Type Field Description
      private static int N1  
      private static int N2  
      private static int N3  
      private static int N4  
    • Constructor Summary

      Constructors 
      Modifier Constructor Description
      private MaskUtil()  
    • Constructor Detail

      • MaskUtil

        private MaskUtil()
    • Method Detail

      • applyMaskPenaltyRule1

        static int applyMaskPenaltyRule1​(ByteMatrix matrix)
        Apply mask penalty rule 1 and return the penalty. Find repetitive cells with the same color and give penalty to them. Example: 00000 or 11111.
      • applyMaskPenaltyRule2

        static int applyMaskPenaltyRule2​(ByteMatrix matrix)
        Apply mask penalty rule 2 and return the penalty. Find 2x2 blocks with the same color and give penalty to them. This is actually equivalent to the spec's rule, which is to find MxN blocks and give a penalty proportional to (M-1)x(N-1), because this is the number of 2x2 blocks inside such a block.
      • applyMaskPenaltyRule3

        static int applyMaskPenaltyRule3​(ByteMatrix matrix)
        Apply mask penalty rule 3 and return the penalty. Find consecutive runs of 1:1:3:1:1:4 starting with black, or 4:1:1:3:1:1 starting with white, and give penalty to them. If we find patterns like 000010111010000, we give penalty once.
      • isWhiteHorizontal

        private static boolean isWhiteHorizontal​(byte[] rowArray,
                                                 int from,
                                                 int to)
      • isWhiteVertical

        private static boolean isWhiteVertical​(byte[][] array,
                                               int col,
                                               int from,
                                               int to)
      • applyMaskPenaltyRule4

        static int applyMaskPenaltyRule4​(ByteMatrix matrix)
        Apply mask penalty rule 4 and return the penalty. Calculate the ratio of dark cells and give penalty if the ratio is far from 50%. It gives 10 penalty for 5% distance.
      • getDataMaskBit

        static boolean getDataMaskBit​(int maskPattern,
                                      int x,
                                      int y)
        Return the mask bit for "getMaskPattern" at "x" and "y". See 8.8 of JISX0510:2004 for mask pattern conditions.
      • applyMaskPenaltyRule1Internal

        private static int applyMaskPenaltyRule1Internal​(ByteMatrix matrix,
                                                         boolean isHorizontal)
        Helper function for applyMaskPenaltyRule1. We need this for doing this calculation in both vertical and horizontal orders respectively.