1. IronBarcode
2. Troubleshooting
3. False Positives

False Positives

How to Remove False Positives?

False positives in barcode reading can happen when complex background patterns look like barcodes, or when noise and artifacts create unintended marks that the reader mistakenly sees as valid barcodes. The following steps can be taken to remove false positives from IronBarcode's reading output:

1. Tell IronBarCode to read only the barcode formats you expect. A complete list of options is shown here: BarcodeEncoding.
2. Enable the RemoveFalsePositive property. When scanning for barcodes, IronBarcode will search for "candidate" regions of an image for what looks most likely like a barcode, then attempts to decode that region. By setting this to true, IronBarcode will only attempt to decode regions that have no errors in their encoding. By default, RemoveFalsePositive is already set to true.

using IronBarCode;

BarcodeReaderOptions myOptionsExample = new BarcodeReaderOptions()
{
    // Expect and return barcode results for only the Code 39 type.
    ExpectBarcodeTypes = IronBarCode.BarcodeEncoding.Code39,

    // Remove false positives.
    RemoveFalsePositive = true
};

var results = BarcodeReader.Read("barcode.png", myOptionsExample);

using IronBarCode;

BarcodeReaderOptions myOptionsExample = new BarcodeReaderOptions()
{
    // Expect and return barcode results for only the Code 39 type.
    ExpectBarcodeTypes = IronBarCode.BarcodeEncoding.Code39,

    // Remove false positives.
    RemoveFalsePositive = true
};

var results = BarcodeReader.Read("barcode.png", myOptionsExample);

Imports IronBarCode

Private myOptionsExample As New BarcodeReaderOptions() With {
	.ExpectBarcodeTypes = IronBarCode.BarcodeEncoding.Code39,
	.RemoveFalsePositive = True
}

Private results = BarcodeReader.Read("barcode.png", myOptionsExample)