Quickly Adjust on the Performance

By following the previous guide, I believe you have managed to create your own barcode reader project. However, you might be still stuck in some aspects:

• There are some barcodes I can’t recognize.
• The processing speed is too slow.
• There are misreading results.

In this article, we will share some solutions to help you solve the above issues.

How to Decode the Unrecognized Barcodes

There are several reasons that may cause a barcode unrecognized.

Generally speaking

• The barcode reader failed to locate the barcode.
• The barcode is located but the result cannot be decoded.

Adjust the DeblurLevel

DeblurLevel is the parameter that controls how much effort the library spends on decoding the localized barcodes. Set a higher value of the DeblurLevel will improve the recognition rate and decrease the recognition speed at the same time. DeblurLevel is set to 9 (the highest level) by default. Therefore, if you find the recognition speed is not satisfying, you can reduce the DeblurLevel to balance the performance.

do{
   let settings = try barcodeReader.getRuntimeSettings()
   settings.deblurLevel = 0
   try barcodeReader.updateRuntimeSettings(settings!)
}catch{
   // Add your code to deal with exceptions
}

Enlarge the Resolution

When decoding from the video streaming, it is recommended to set the resolution to 1080P.

dce.setResolution(Resolution.EnumRESOLUTION_1080P)

Add Localization Modes

The LocalizationModes determines how the library locates the barcode. Set multiple LocalizationModes can help the library to find at least one barcode for further processing. When you find there are barcodes that can’t be recognized, you may try adding extra parameters to the LocalizationModes.

do{
   let settings = try barcodeReader.getRuntimeSettings()
   settings.localizationModes = [EnumLocalizationMode.scanDirectly, EnumLocalizationMode.connectedBlocks]
   try barcodeReader.updateRuntimeSettings(settings!)
}catch{
   // Add your code to deal with exceptions
}

How to Improve the Speed

Set ScaleDownThreshold

Images with higher pixel density than the threshold will be scaled down. The default value of ScaleDownThreshold is 2300 (pixel). You can set a smaller value when you need to speed up the recognition.

do{
   let settings = try barcodeReader.getRuntimeSettings()
   settings.scaleDownThreshold = 1200
   try barcodeReader.updateRuntimeSettings(settings!)
}catch{
   // Add your code to deal with exceptions
}

Reduce Timeout for Video Streaming Barcode Decoding

Timeout, which is measured by milliseconds, determines the maximum time the library will spend on each image. Decreasing the value of Timeout might help you on improving the recognition speed of video decoding. Some low-end devices may not be able to complete the barcode processing if the Timeout is too short. Ensure to fully test before given a suitable Timeout for low-end devices.

do{
   let settings = try barcodeReader.getRuntimeSettings()
   settings.timeout = 500
   try barcodeReader.updateRuntimeSettings(settings!)
}catch{
   // Add your code to deal with exceptions
}

How to Filter out the Misreading Results

Increase Confidence Level

MinResultConfidence is the parameter that controls the result confidence to filter the results below the set confidence. The default value of MinResultConfidence is 30. You can set MinResultConfidence higher to get even more accurate results.

do{
   let settings = try barcodeReader.getRuntimeSettings()
   settings.minResultConfidence = 50
   try barcodeReader.updateRuntimeSettings(settings!)
}catch{
   // Add your code to deal with exceptions
}

Enable Result Verification

Use multiple barcode results from different video frames to verify the correctness of the results. You can enable the result verification to further improve the result accuracy.

reader.enableResultVerification = true

Other Settings

If the above settings can not solve the issues you have, feel free to contact us for further technical support. DBR has a lot of built-in parameters for image processing, localization supporting and barcode decoding. Please feedback your problems to us so that our technical support team will help you configure the parameters to match your requirements.