How to Read DPM Codes

What is DPM (Direct Part Marking)?

It is the process of creating permanent markings on the surface of a part to help identify it. DPM Codes are used widely in industrial part tracking, from electronics manufacturing to automotive assembly. Atypical from general scenarios, DPM Codes present more challenges, including light reflection interference from the surface the code is printed on, low contrast, and complex background texture. For reference, here are two sample images of DPM codes:

DPM sample image1 DPM sample image2

Particular Parameter Required

Dynamsoft Barcode Reader (DBR) provides a parameter, DPMCodeReadingModes, to control how to decode DPM codes. To enable the DPM feature, simply set a DPMCRM_GENERAL mode to this parameter.

Sample Code

Below is an example illustrating how to configure the parameter DPMCodeReadingModes to read DPM code.

update parameter DPMCodeReadingModes in your JSON template

  {
      "CaptureVisionTemplates": [
          {
              "Name" : "CV_0",
              "ImageROIProcessingNameArray": ["TA_0" ]
          }       
      ],
      "TargetROIDefOptions" : [
          {
              "Name" : "TA_0",
              "TaskSettingNameArray": [ "BR_0" ]
          }
      ],
      "BarcodeReaderTaskSettingOptions": [
          {
              "Name" : "BR_0",
              "DPMCodeReadingModes": [
                  {
                      "Mode": "DPMCRM_GENERAL"
                  }
              ]
          }
      ]
  }

apply settings by calling method InitSettingsFromFile

C++
Android
Objective-C
Swift

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.
}