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Scanning Challenging DataMatrix Codes Etched on Metals
The DataMatrix code is crucial in inventory management, manufacturing, and supply chain logistics. These compact 2D barcodes are essential for Direct Part Marking (DPM), allowing manufacturers to imprint vital information directly onto metal components. This information is critical for identification, traceability, and quality control throughout a product’s life cycle.
However, scanning DataMatrix codes on metal surfaces can be challenging due to the metal’s unique characteristics, resulting in scanning failures and frustration. This blog explores the common scanning challenges associated with DataMatrix codes on metal and provides solutions to ensure reliable and robust scanning processes.
Challenges of Scanning DataMatrix Codes on Metals
Although DataMatrix codes are robust, scanning them on metal surfaces can present challenges.
- Low Contrast
When a DataMatrix code is engraved onto metal, the color of the engraving can merge with the metal surface. This low contrast makes it challenging for scanners to differentiate between the dark and light elements of the code. Uneven engraving can also result in varying dot depths, leading to shadows that can make the scanning process more challenging.
- Inverted DataMatrix Codes
Inverted DataMatrix codes etched on metals have the dark and light elements reversed, making them difficult to scan due to low contrast.
- Code Imperfections
Etching imperfections may cause irregularly shaped dots in the DataMatrix code. Distorted or missing dots can prevent accurate code decoding by scanners.
- Deformed DataMatrix Codes Due to Varying Metal Surfaces
Metal surfaces may be uneven, rough, or curved, which can distort the appearance of the barcode and make it difficult to scan. Surface damage, such as scratches and abrasions, can further complicate the process of scanning DataMatrix codes.
- Lighting Conditions
Proper lighting is essential for reading DataMatrix codes on metal. Inadequate lighting can hinder scanners in distinguishing between the dark and light elements of the code, especially with low-contrast etching. Additionally, glare from reflective metal surfaces can overpower the scanner, causing the details of the code to be washed out.
Overcoming DataMatrix Code Scanning Challenges: How Dynamsoft Barcode Reader Helps
Having the right tools can make all the difference when faced with the intricacies of scanning DataMatrix codes on metal. The Dynamsoft Barcode Reader is designed to tackle these challenges effectively. Its advanced features enable manufacturers and supply chain professionals to achieve successful scans, even in demanding environments consistently.
The Dynamsoft Barcode Reader SDK provides extensive parameter configurations and modes for modifying these parameters to utilize different image processing methods for better barcode readability.
Let’s analyze how it tackles the challenging DataMatrix codes etched on metal surfaces.
1. Low Contrast
Dynamsoft Barcode Reader leverages the following modes to tackle low-contrast DataMatrix codes.
- GEM_GRAY_EQUALIZE: This mode is suitable for images with low contrast in the background and foreground.
- GEM_GRAY_SMOOTH: This mode is effective for images with noise or texture.
- GEM_SHARPEN_SMOOTH: This mode can be used to reduce blur.
2. Inverted DataMatrix Codes
Dynamsoft Barcode Reader’s GrayscaleTransformationModes helps decode inverted DataMatrix codes.
- GTM_ORIGINAL: Scans standard black-on-white barcodes.
- GTM_INVERTED: Scans inverted white-on-black barcodes.
- GTM_ORIGINAL + GTM_INVERTED: Prioritizes standard barcodes, then tries inverting if unsuccessful.
This adaptable approach ensures both standard and inverted DataMatrix codes are recognized, boosting decoding reliability.
3. Code Imperfections
DataMatrix codes employ advanced error correction (ECC 200) based on Reed-Solomon algorithms, enabling decoding even when up to 30% of the code is damaged. This durability makes them well-suited for harsh environments, such as etched metal surfaces.
The Dynamsoft Barcode Reader is designed to leverage the ECC to reconstruct missing or damaged barcode data. Other than that, it utilizes the following techniques for tackling code imperfections.
- Deblurring : It further leverages DeblurLevel for deblurring or smoothing techniques to mitigate the impact of scratches. Increasing the DeblurLevel to 9 instructs the Dynamsoft Barcode Reader SDK to enhance the legibility of blurred barcodes, improving the chances of successful decoding.
- LocalizationModes: The Dynamsoft Barcode Reader utilizes LocalizationModes to locate and correctly identify the distorted barcodes. LM_CONNECTED_BLOCKS uses connected blocks to locate the barcode. LM_LINES uses lines to help identify and correct distortions.
Lastly, applying ImagePreprocessingModes enhances the image quality, making the DataMatrix code easier for the scanner to identify and decode.
4. Deformed DataMatrix Codes Due to Varying Metal Surfaces
The Dynamsoft Barcode Reader offers DeformationResistingModes to handle distorted and deformed barcodes. To get deformed DatMatrix codes scanned, the deformation resistance needs to be enabled by adding-
- DRM_BROAD_WARP: Resists deformation when the barcode undergoes slight warping.
- DRM_LOCAL_REFERENCE: Withstands deformation for barcodes with minor deformation in local modules.
- DRM_DEWRINKLE: Resists deformation of barcodes on wrinkled surfaces.
DBR offers the option to choose a single DeformationResistingMode or combine multiple modes. When multiple modes are selected, the Dynamsoft Barcode Reader library will intelligently cycle through them until it successfully detects the number of barcodes specified in ExpectedBarcodeCount.
5. Poor Lighting Issues
To tackle uneven lighting in images, Dynamsoft Barcode Reader offers an adaptive binarization mode called BM_LOCAL_BLOCK. This intelligent technique adjusts thresholding for different image regions, significantly improving the decoding of challenging barcodes affected by shadows or glare.
Try Dynamsoft Barcode Reader Online Demo
Contact the Dynamsoft Technical Support Team for More Info
If you need to optimize your DataMatrix scanning processes on metal, consider contacting the Dynamsoft technical support team. Our team will be happy to offer expert guidance on choosing the right scanner model, optimizing your application’s settings, and troubleshooting any issues that may arise.
With the right knowledge and equipment, you can utilize DataMatrix codes for Direct Part Marking to streamline operations, improve traceability, and enhance quality control in the manufacturing process.