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Add sharpening filter to this implementation too

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git-svn-id: https://zxing.googlecode.com/svn/trunk@415 59b500cc-1b3d-0410-9834-0bbf25fbcc57
This commit is contained in:
srowen 2008-06-11 18:12:41 +00:00
parent 284c1776d5
commit 3140b4abdb
1 changed files with 24 additions and 3 deletions
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27
javame/src/com/google/zxing/client/j2me/LCDUIImageMonochromeBitmapSource.java
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@ -62,9 +62,30 @@ public final class LCDUIImageMonochromeBitmapSource implements MonochromeBitmapS
} else {
row.clear();
}
for (int i = 0, offset = y * width + startX; i < getWidth; i++, offset++) {
if (computeRGBLuminance(rgbPixels[offset]) < blackPoint) {
row.set(i);
// If the current decoder calculated the blackPoint based on one row, assume we're trying to
// decode a 1D barcode, and apply some sharpening.
// TODO: We may want to add a fifth parameter to request the amount of shapening to be done.
if (lastMethod.equals(BlackPointEstimationMethod.ROW_SAMPLING)) {
int offset = y * width + startX;
int left = computeRGBLuminance(rgbPixels[offset]);
offset++;
int center = computeRGBLuminance(rgbPixels[offset]);
for (int i = 1; i < getWidth - 1; i++, offset++) {
int right = computeRGBLuminance(rgbPixels[offset + 1]);
// Simple -1 4 -1 box filter with a weight of 2
int luminance = ((center << 2) - left - right) >> 1;
if (luminance < blackPoint) {
row.set(i);
}
left = center;
center = right;
}
} else {
for (int i = 0, offset = y * width + startX; i < getWidth; i++, offset++) {
if (computeRGBLuminance(rgbPixels[offset]) < blackPoint) {
row.set(i);
}
}
}
return row;