How to Get Barcode Confidence and Rotation Angle

This article offers two examples about how to get result confidence and barcode rotation angle.

Barcode Confidence

The score of recognition confidence could measure the reliability of a recognized result. The higher the score, the more precise the results are.

Barcode Rotation Angle

Dynamsoft Barcode Reader SDK is able to detect barcodes at all angles. The SDK is also able to return the angles of the barcodes decoded.

The following illustrations will show how the angle is calculated for different barcode types:

1. OneD Barcode

2. QR Code

3. Data Matrix

4. Aztec

5. Maxicode

Code Snippet for Getting Confidence and Angle

The following code snippet shows how to get the confidence and rotation angle of the barcode result:

• JavaScript
• C
• C++
• C#
• Java
• Android
• Objective-C
• Swift
• Python

(async() => {
    let scanner = await Dynamsoft.DBR.BarcodeScanner.createInstance();
    scanner.onUniqueRead = (txt, result) => {
        let conficence = result.localizationResult.confidence;
        let angle = result.localizationResult.angle;
        alert(txt);
    };
    await scanner.show();
})();

int iRet = -1;
char errorBuf[512];
TextResultArray* paryResult = NULL;
iRet = DBR_InitLicense("YOUR-LICENSE-KEY", errorBuf, 512);
if (iRet != DBR_OK)
{
    printf("%s\n", errorBuf);
}
void* reader = DBR_CreateInstance();
DBR_DecodeFile(reader, "YOUR-IMAGE-FILE-PATH", ""); // Start decoding
DBR_GetAllTextResults(reader, &paryResult);
for (int iIndex = 0; iIndex < paryResult->resultsCount; iIndex++)
{
    int confidence = paryResult->results[iIndex]->results[0]->confidence;
    int angle = paryResult->results[iIndex]->localizationResult->angle;
    //add further process with the confidence and angle
}
DBR_FreeTextResults(&paryResult);
// Add further process

char errorBuf[512];
int iRet = -1;
TextResultArray* paryResult = NULL;
iRet = dynamsoft::dbr::CBarcodeReader::InitLicense("YOUR-LICENSE-KEY", errorBuf, 512);
if (iRet != DBR_OK)
{
    cout << errorBuf << endl;
}
CBarcodeReader* reader = new CBarcodeReader();
reader->DecodeFile("YOUR-IMAGE-FILE-PATH", ""); // Start decoding
reader->GetAllTextResults(&paryResult);
for (int iIndex = 0; iIndex < paryResult->resultsCount; iIndex++)
{
    int confidence = paryResult->results[iIndex]->results[0]->confidence;
    int angle = paryResult->results[iIndex]->localizationResult->angle;
    //add further process with the confidence and angle
}
CBarcodeReader::FreeTextResults(&paryResult);
// Add further process

string errorMsg;
EnumErrorCode iRet = BarcodeReader.InitLicense("YOUR-LICENSE-KEY", out errorMsg);
if (iRet != EnumErrorCode.DBR_SUCCESS)
{
    Console.WriteLine(errorMsg);
}
BarcodeReader reader = new BarcodeReader();
TextResult[] result = reader.DecodeFile("YOUR-IMAGE-FILE-PATH", ""); // Start decoding
for (int iIndex = 0; iIndex < result.Length; iIndex++)
{
    int confidence = result[iIndex].Results[0].Confidence;
    int angle = result[iIndex].LocalizationResult.Angle;
    //add further process with the confidence and angle
}
// Add further process

BarcodeReader.initLicense("YOUR-LICENSE-KEY");
BarcodeReader reader = new BarcodeReader();
TextResult[] result = reader.decodeFile("YOUR-IMAGE-FILE-PATH", ""); // Start decoding
for (int iIndex = 0; iIndex < result.length; iIndex++)
{
    int confidence = result[iIndex].results[0].confidence;
    int angle = result[iIndex].localizationResult.angle;
    //add further process with the confidence and angle
}
// Add further process

BarcodeReader reader = new BarcodeReader();
TextResult[] result = reader.decodeFile("YOUR-IMAGE-FILE-PATH"); // Start decoding
for (int iIndex = 0; iIndex < result.length; iIndex++)
{
    int confidence = result[iIndex].results[0].confidence;
    int angle = result[iIndex].localizationResult.angle;
    //add further process with the confidence and angle
}
// Add further process

NSError *error = nil;
DynamsoftBarcodeReader* reader = [[DynamsoftBarcodeReader alloc] init];
NSArray<iTextResult*>* result = [reader decodeFileWithName:@"YOUR-IMAGE-FILE-PATH" error:&err]; // Start decoding
for (iTextResult* barcode in result)
{
    int confidence = barcode.results[0].confidence;
    int angle = barcode.localizationResult.angle;
    //add further process with the confidence and angle
}
// Add further process

let reader = DynamsoftBarcodeReader.init()
var result: [iTextResult]? = nil
do {
    result = try reader.decodeFileWithName("YOUR-IMAGE-FILE-PATH")
} catch let err {
} // Start decoding
for barcode in result ?? [] {
    let confidence = barcode.results[0].confidence
    let angle = barcode.localizationResult.angle
    //add further process with the confidence and angle
}
// Add further process

error = BarcodeReader.init_license("YOUR-LICENSE-KEY")
if error[0] != EnumErrorCode.DBR_OK:
    print(error[1])
dbr = BarcodeReader()
text_results = dbr.decode_file("YOUR-IMAGE-FILE-PATH")
for result in text_results:
    confidence = result.extended_results[0].confidence
    angle = result.localization_result.angle
    #add further process with the confidence and angle