Package com.google.zxing.qrcode.encoder

Class MaskUtil

java.lang.Object

com.google.zxing.qrcode.encoder.MaskUtil

final class MaskUtil
extends Object

Author:

Satoru Takabayashi, Daniel Switkin, Sean Owen

Method Summary

Modifier and Type	Method	Description
(package private) static int	applyMaskPenaltyRule1(ByteMatrix matrix)	Apply mask penalty rule 1 and return the penalty.
(package private) static int	applyMaskPenaltyRule2(ByteMatrix matrix)	Apply mask penalty rule 2 and return the penalty.
(package private) static int	applyMaskPenaltyRule3(ByteMatrix matrix)	Apply mask penalty rule 3 and return the penalty.
(package private) static int	applyMaskPenaltyRule4(ByteMatrix matrix)	Apply mask penalty rule 4 and return the penalty.
(package private) static boolean	getDataMaskBit(int maskPattern, int x, int y)	Return the mask bit for "getMaskPattern" at "x" and "y".

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

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.

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.