How to Read Barcodes from an Image With Lots of Text

When trying to read an image where a barcode is surrounded by a large amount of irrelevant text, the presence of these characters may lead to incorrect positioning and slow down the execution speed. Dynamsoft Barcode Reader (DBR) provides a parameter, TextFilterModes, to control how to filter texts on an image.

Sample Code

The following code snippet shows how to set the text filtering function through the RuntimeSettings.

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

// Obtains the current runtime settings of DBR.
let rs = await scanner.getRuntimeSettings();
// Sets the text filter mode.
rs.furtherModes.textFilterModes[0] = Dynamsoft.DBR.EnumTextFilterMode.TFM_GENERAL_CONTOUR;
// Updates the settings.
await scanner.updateRuntimeSettings(rs);
await scanner.show();

BarcodeReader reader = new BarcodeReader();
PublicRuntimeSettings settings = reader.getRuntimeSettings(); //Get the current RuntimeSettings
settings.furtherModes.textFilterModes[0] = EnumTextFilterMode.TFM_GENERAL_CONTOUR; // Set a TFM_GENERAL_CONTOUR mode to filter texts
reader.updateRuntimeSettings(settings); // Update RuntimeSettings with above setting
TextResult[] result = reader.decodeFile("YOUR-IMAGE-FILE-PATH"); // Start decoding
// Add further process

NSError *err = nil;
DynamsoftBarcodeReader* reader = [[DynamsoftBarcodeReader alloc] init];
//Get the current RuntimeSettings
iPublicRuntimeSettings* settings = [reader getRuntimeSettings:&err];
settings.furtherModes.textFilterModes[0] = EnumTextFilterModeGeneralContour; // Set a TFM_GENERAL_CONTOUR mode to filter texts
[reader updateRuntimeSettings:settings error:&err]; // Update RuntimeSettings with above setting
NSArray<iTextResult*>* result = [reader decodeFileWithName:@"YOUR-IMAGE-FILE-PATH" error:&err]; // Start decoding
// Add further process

let reader = DynamsoftBarcodeReader.init()
//Get the current RuntimeSettings
let settings = try? reader.getRuntimeSettings()
settings.furtherModes.textFilterModes?[0] = EnumTextFilterMode.generalContour; // Set a TFM_GENERAL_CONTOUR mode to filter texts
try? reader.updateRuntimeSettings(settings) // Update RuntimeSettings with above setting
let result = try? reader.decodeFileWithName("YOUR-IMAGE-FILE-PATH") // Start decoding
// Add further process

error = BarcodeReader.init_license("YOUR-LICENSE-KEY")
if error[0] != EnumErrorCode.DBR_OK:
    print(error[1])
dbr = BarcodeReader()
settings = dbr.get_runtime_settings()
settings.text_filter_modes[0] = EnumTextFilterMode.TFM_GENERAL_CONTOUR
dbr.update_runtime_settings(settings)
text_results = dbr.decode_file("YOUR-IMAGE-FILE-PATH")
# Add further process

BarcodeReader.initLicense("YOUR-LICENSE-KEY");
BarcodeReader reader = new BarcodeReader();
PublicRuntimeSettings settings = reader.getRuntimeSettings(); //Get the current RuntimeSettings
settings.furtherModes.textFilterModes[0] = EnumTextFilterMode.TFM_GENERAL_CONTOUR; // Set a TFM_GENERAL_CONTOUR mode to filter texts
reader.updateRuntimeSettings(settings); // Update RuntimeSettings with above setting
TextResult[] result = reader.decodeFile("YOUR-IMAGE-FILE-PATH", ""); // Start decoding
// 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();
PublicRuntimeSettings settings = reader.GetRuntimeSettings(); //Get the current RuntimeSettings
settings.FurtherModes.TextFilterModes[0] = EnumTextFilterMode.TFM_GENERAL_CONTOUR; // Set a TFM_GENERAL_CONTOUR mode to filter texts
reader.UpdateRuntimeSettings(settings); // Update RuntimeSettings with above setting
TextResult[] result = reader.DecodeFile("YOUR-IMAGE-FILE-PATH", ""); // Start decoding
// Add further process

char errorBuf[512];
int iRet = -1;
iRet = dynamsoft::dbr::CBarcodeReader::InitLicense("YOUR-LICENSE-KEY", errorBuf, 512);
if (iRet != DBR_OK)
{
    cout << errorBuf << endl;
}
CBarcodeReader* reader = new CBarcodeReader();
PublicRuntimeSettings* runtimeSettings = new PublicRuntimeSettings();
reader->GetRuntimeSettings(runtimeSettings); //Get the current RuntimeSettings
runtimeSettings->furtherModes.textFilterModes[0] = TFM_GENERAL_CONTOUR; // Set a TFM_GENERAL_CONTOUR mode to filter texts
reader->UpdateRuntimeSettings(runtimeSettings, errorBuf, 512); // Update RuntimeSettings with above setting
reader->DecodeFile("YOUR-IMAGE-FILE-PATH", ""); // Start decoding
// Add further process

int iRet = -1;
char errorBuf[512];
iRet = DBR_InitLicense("YOUR-LICENSE-KEY", errorBuf, 512);
if (iRet != DBR_OK)
{
    printf("%s\n", errorBuf);
}
void* reader = DBR_CreateInstance();
PublicRuntimeSettings runtimeSettings;
DBR_GetRuntimeSettings(reader, &runtimeSettings); //Get the current RuntimeSettings
runtimeSettings.furtherModes.textFilterModes[0] = TFM_GENERAL_CONTOUR; // Set a TFM_GENERAL_CONTOUR mode to filter texts
DBR_UpdateRuntimeSettings(reader, &runtimeSettings, errorBuf, 512); // Update RuntimeSettings with above setting
DBR_DecodeFile(reader, "YOUR-IMAGE-FILE-PATH", ""); // Start decoding
// Add further process