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issue-49: Experimenting with different bar/space widths

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This commit is contained in:
Christoph Oberhofer
2015-07-22 23:20:09 +02:00
parent 9c0248f1d7
commit df6b447db7
1 changed files with 33 additions and 13 deletions
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src/i2of5_reader.js
+29 -9
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@@ -38,7 +38,26 @@ define(
I2of5Reader.prototype = Object.create(BarcodeReader.prototype, properties);
I2of5Reader.prototype.constructor = I2of5Reader;
I2of5Reader.prototype._findPattern = function(pattern, offset) {
I2of5Reader.prototype._matchPattern = function(counter, code) {
var i,
counterSum = [0, 0],
codeSum = [0, 0],
correction = [0, 0];
for (i = 0; i < counter.length; i++) {
counterSum[i % 2] += counter[i];
codeSum[i % 2] += code[i]
}
correction[0] = codeSum[0]/counterSum[0];
correction[1] = codeSum[1]/counterSum[1];
for (i = 0; i < counter.length; i++) {
counter[i] *= correction[i % 2];
}
return BarcodeReader.prototype._matchPattern.call(this, counter, code);
};
I2of5Reader.prototype._findPattern = function(pattern, offset, isWhite, tryHarder) {
var counter = [],
self = this,
i,
@@ -53,9 +72,11 @@ define(
j,
sum,
normalized,
isWhite = false,
epsilon = self.AVG_CODE_ERROR;
isWhite = isWhite || false;
tryHarder = tryHarder || false;
if (!offset) {
offset = self._nextSet(self._row);
}
@@ -84,12 +105,16 @@ define(
return bestMatch;
}
}
for ( j = 0; j < counter.length - 2; j++) {
if (tryHarder) {
for (j = 0; j < counter.length - 2; j++) {
counter[j] = counter[j + 2];
}
counter[counter.length - 2] = 0;
counter[counter.length - 1] = 0;
counterPos--;
} else {
return null;
}
} else {
counterPos++;
}
@@ -107,7 +132,7 @@ define(
startInfo;
while(!startInfo) {
startInfo = self._findPattern(self.START_PATTERN, offset);
startInfo = self._findPattern(self.START_PATTERN, offset, false, true);
if (!startInfo) {
return null;
}
@@ -274,11 +299,6 @@ define(
return null;
}
// Checksum
if (!self._checksum(result)) {
return null;
}
return {
code : result.join(""),
start : startInfo.start,