TinyBarcodeDecoding Sample

When processing a small-sized barcode or a barcode that is localized far away, the following factors might cause the low performance:

• The module size of the barcode is too small.
• The image quality of the barcode zone is too low.

TinyBarcodeDecodingSample is the sample to tell you how Dynamsoft Barcode Reader is designed to process the tiny barcodes.

Zoom Control

Set the Zoom Factor

Generally, control the camera to zoom-in has better effect than apporaching to the target because some device have difficulty on close-up focus.

Here is the sample code to enlarge the zoom factor:

• Objective-C
• Swift

1. // Include DynamsoftCameraEnhancer library and initialize an instance of DCE
   #import <DynamsoftCameraEnhancer/DynamsoftCameraEnhancer.h>
   ...
   @property (nonatomic, strong) DynamsoftCameraEnhancer *dce;
   @property (nonatomic, strong) DCECameraView *dceView;
   ...
   - (void)configurationDCE{
      _dceView = [DCECameraView cameraWithFrame:self.view.bounds];
      [self.view addSubView:_dceView];
      _dce = [[DynamsoftCameraEnhancer alloc] initWithView:_dceView];
      // Enable the auto-zoom feature
      [_dce setZoom:3.0f];
   }
   

2. import DynamsoftCameraEnhancer
   var dce:DynamsoftCameraEnhancer! = nil
   var dceView:DCECameraView! = nil
   func configurationDCE() {
      dceView = DCECameraView.init(frame: self.view.bounds)
      self.view.addSubview(dceView)
      dce = DynamsoftCameraEnhancer.init(view: dceView)
      dce.setZoom(3.0)
   }
   

Enable Auto-zoom

Auto-zoom is another way for you to change the zoom factor. When the auto-zoom feature is enabled, the camera will zoom-in automatically when a barcode is located be not decoded. The auto-zoom-out will be triggered when barcode is decoded successfully.

• Objective-C
• Swift

1. // Include DynamsoftCameraEnhancer library and initialize an instance of DCE
   #import <DynamsoftCameraEnhancer/DynamsoftCameraEnhancer.h>
   ...
   @property (nonatomic, strong) DynamsoftCameraEnhancer *dce;
   @property (nonatomic, strong) DCECameraView *dceView;
   ...
   - (void)configurationDCE{
      _dceView = [DCECameraView cameraWithFrame:self.view.bounds];
      [self.view addSubView:_dceView];
      _dce = [[DynamsoftCameraEnhancer alloc] initWithView:_dceView];
      // Enable the auto-zoom feature
      [_dce enableFeatures:EnumAUTO_ZOOM error: &error];
   }
   

2. // Include DynamsoftCameraEnhancer library and initialize an instance of DCE
   import DynamsoftCameraEnhancer
   ...
   var dce:DynamsoftCameraEnhancer! = nil
   var dceView:DCECameraView! = nil
   ...
   func configurationDCE() {
      dceView = DCECameraView.init(frame: self.view.bounds)
      self.view.addSubview(dceView)
      dce = DynamsoftCameraEnhancer.init(view: dceView)
      dce.enableFeatures(EnumEnhancerFeature.EnumAUTO_ZOOM.rawValue, error: &error)
   }
   

Note: A valid license is required to use auto-zoom feature.

Focus Control

Select a suitable focus mode can help you further improve the read-rate and accuracy when processing small-size barcodes.

When your device is stable, you can lock the focal length after focusing is complete.

• Objective-C
• Swift

1. // Include DynamsoftCameraEnhancer library and initialize an instance of DCE
   #import <DynamsoftCameraEnhancer/DynamsoftCameraEnhancer.h>
   ...
   @property (nonatomic, strong) DynamsoftCameraEnhancer *dce;
   @property (nonatomic, strong) DCECameraView *dceView;
   ...
   - (void)configurationDCE{
      _dceView = [DCECameraView cameraWithFrame:self.view.bounds];
      [self.view addSubView:_dceView];
      _dce = [[DynamsoftCameraEnhancer alloc] initWithView:_dceView];
      // Enable the auto-zoom feature
      CGPoint focusPoint = {0.5, 0.5};
      [_dce setFocus:focusPoint subsequentFocusMode:EnumFocusMode.FM_LOCKED];
   }
   

2. // Include DynamsoftCameraEnhancer library and initialize an instance of DCE
   import DynamsoftCameraEnhancer
   ...
   var dce:DynamsoftCameraEnhancer! = nil
   var dceView:DCECameraView! = nil
   ...
   func configurationDCE() {
      dceView = DCECameraView.init(frame: self.view.bounds)
      self.view.addSubview(dceView)
      dce = DynamsoftCameraEnhancer.init(view: dceView)
      let focusPoint = CGPoint(x:0.5, y:0.5)
      dce.setFocus(focusPoint, subsequentFocusMode:EnumFocusMode.FM_LOCKEDD)
   }
   

If your device is not stable, you can replace the last line with the following code to keep the continuous auto focus mode.

• Objective-C
• Swift

1. [_dce setFocus:focusPoint subsequentFocusMode:EnumFocusMode.FM_CONTINUOUS_AUTO];
   

2. dce.setFocus(focusPoint, subsequentFocusMode:EnumFocusMode.FM_CONTINUOUS_AUTO)
   

Scale-up Mode

When processing a still image, you don’t have the opportunity to optimize the quality of the image. For this scenario, if you are processing a small-sized barcode, the ScaleUpMode might help you to read barcode.

The following Code Snippet shows you how to set the ScaleUpMode:

• Objective-C
• Swift

1. NSError* err = nil;
   iPublicRuntimeSettings* settings = [reader getRuntimeSettings:&err];
   settings.scaleUpModes.grayscaleTransformationModes = @[@(EnumScaleUpModeLinearInterpolation),@(EnumScaleUpModeNeighbourInterpolation)];
   [reader updateRuntimeSettings:settings error:&err];
   

2. do{
      let settings = try barcodeReader.getRuntimeSettings()
      settings.scaleUpModes = [EnumScaleUpMode.linearInterpolation.original.rawValue, EnumScaleUpMode.neighbourInterpolation.rawValue]
      try barcodeReader.updateRuntimeSettings(settings)
   }catch{
      // Add your code to deal with exceptions
   }
   

For more introductions about scale up mode, please read more in the Parameter-ScaleUpModes page.

View the sample

• TinyBarcodeDecoding Swift Sample
• TinyBarcodeDecoding Objective-C Sample