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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 parameter TextDetectionMode and IfEraseTextZone to control how to filter texts on an image.

Sample Code

Below is an example illustrating how to configure the parameters to control text filtering function.

  • update parameters in your JSON template

      {
          "CaptureVisionTemplates": [
              {
                  "Name": "CV_0",
                  "ImageROIProcessingNameArray": ["TA_0" ]
              }       
          ],
          "TargetROIDefOptions" : [
              {
                  "Name": "TA_0",
                  "TaskSettingNameArray": [ "BR_0" ]
              }
          ],
          "BarcodeReaderTaskSettingOptions": [
              {
                  "Name" : "BR_0",
                  "SectionImageParameterArray": [
                      {
                          "Section": "ST_REGION_PREDETECTION",
                          "ImageParameterName": "IP_0"
                      },
                      {
                          "Section": "ST_BARCODE_LOCALIZATION",
                          "ImageParameterName": "IP_0"
                      },
                      {
                          "Section": "ST_BARCODE_DECODING",
                          "ImageParameterName": "IP_0"
                      }
                  ]
              }
          ],
          "ImageParameterOptions": [
              {
                  "Name": "IP_0",
                  "TextDetectionMode":
                  {
                      "Mode": "TTDM_LINE",
                      "Direction": "UNKNOWN",
                      "CharHeightRange": [1, 100, 1],
                      "MaxSpacingInALine": -1,
                      "Sensitivity": 3
                  },
                  "IfEraseTextZone": 1
              }
          ]
      }
    
  • apply settings by calling method InitSettingsFromFile

  • JavaScript
  • C++
  • Android
  • Objective-C
  • Swift
// `router` is an instance of `CaptureVisionRouter`.
// In the JS edition, the method name we use for initialization is different.
router.initSettings("PATH-TO-YOUR-SETTING")
char szErrorMsg[256] = {0};
CCaptureVisionRouter* cvr = new CCaptureVisionRouter;
cvr->InitSettingsFromFile("PATH-TO-YOUR-SETTING-FILE", szErrorMsg, 256);
// more process here
try {
   // `cvr` is an instance of `CaptureVisionRouter`.
   cvr.initSettingsFromFile("PATH-TO-YOUR-SETTING-FILE");
} catch (CaptureVisionRouterException e) {
   e.printStackTrace();
}
NSError *error;
// `cvr` is an instance of `DSCaptureVisionRouter`.
[self.cvr initSettingsFromFile:@"PATH-TO-YOUR-SETTING-FILE" error:&error];
do{
   //`cvr` is an instance of `CaptureVisionRouter`.
   try cvr.initSettingsFromFile("PATH-TO-YOUR-SETTING-FILE")
}catch{
   // Add code to do when error occurs.
}

This page is compatible for:

Version 7.5.0

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