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Closes Issue #607 : guard against very narrow images which would otherwise cause an exception

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This commit is contained in:
Sean Owen 2016-06-10 13:58:51 +01:00
parent b1f4b5a269
commit 6cdc7493d5
1 changed files with 19 additions and 12 deletions
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15
core/src/main/java/com/google/zxing/common/GlobalHistogramBinarizer.java
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@ -62,23 +62,30 @@ public class GlobalHistogramBinarizer extends Binarizer {
byte[] localLuminances = source.getRow(y, luminances);
int[] localBuckets = buckets;
for (int x = 0; x < width; x++) {
int pixel = localLuminances[x] & 0xff;
localBuckets[pixel >> LUMINANCE_SHIFT]++;
localBuckets[(localLuminances[x] & 0xff) >> LUMINANCE_SHIFT]++;
}
int blackPoint = estimateBlackPoint(localBuckets);
if (width < 3) {
// Special case for very small images
for (int x = 0; x < width; x++) {
if ((localLuminances[x] & 0xff) < blackPoint) {
row.set(x);
}
}
} else {
int left = localLuminances[0] & 0xff;
int center = localLuminances[1] & 0xff;
for (int x = 1; x < width - 1; x++) {
int right = localLuminances[x + 1] & 0xff;
// A simple -1 4 -1 box filter with a weight of 2.
int luminance = ((center * 4) - left - right) / 2;
if (luminance < blackPoint) {
if (((center * 4) - left - right) / 2 < blackPoint) {
row.set(x);
}
left = center;
center = right;
}
}
return row;
}