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Check fewer lines, and make sure we don't run off the top/bottom of image

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git-svn-id: https://zxing.googlecode.com/svn/trunk@175 59b500cc-1b3d-0410-9834-0bbf25fbcc57
This commit is contained in:
srowen 2008-02-12 17:02:27 +00:00
parent bd4ec5e4d8
commit 51bb41ed24
1 changed files with 5 additions and 2 deletions
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7
core/src/com/google/zxing/oned/AbstractOneDReader.java
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@ -51,12 +51,15 @@ public abstract class AbstractOneDReader implements OneDReader {
// rowStep is bigger as the image is taller, but is always at least 1. We've somewhat arbitrarily decided
// that moving up and down by about 1/16 of the image is pretty good.
int middle = height >> 1;
int rowStep = Math.max(1, height >> 5);
for (int x = 0; x < 11; x++) {
int rowStep = Math.max(1, height >> 4);
for (int x = 0; x < 7; x++) {
int rowStepsAboveOrBelow = (x + 1) >> 1;
boolean isAbove = (x & 0x01) == 0; // i.e. is x even?
int rowNumber = middle + rowStep * (isAbove ? rowStepsAboveOrBelow : -rowStepsAboveOrBelow);
if (rowNumber < 0 || rowNumber >= height) {
break;
}
image.estimateBlackPoint(BlackPointEstimationMethod.ROW_SAMPLING, rowNumber);
image.getBlackRow(rowNumber, row, 0, width);