J4L-Datamatrix Vision for .NET

• Introduction
• Installation
• Examples

Installation

J4L Datamatrix Vision is a .NET component which can read (scan) datamatrix barcodes images. It support the following features:

• Finding all barcodes in large images (for example in a scanned page or document)
• Supports byte, ascii , c40 and text encoding.
• Supports all formats except the following rectangular formats: C8X18, C8x32, C12X26, C12X36,, C16X36 and C16X48

The requirements are:

• .NET 1.1 or 2.0

Know limitations are:

• Best result are achieved with black barcodes on white background.
• Shadowed or blurred barcodes can be unreadable.
• Barcodes shall not be rotated

Installation

In order to use the component you only need to add rvisionDM*.dll to your project.

Examples

The delivered ZIP file includes a sample applicaion (DatamatrixSample*.exe) that scans all images in the "images" subdirectory and displays the result in the standard output (MSDOS console).

The use of the component is very simple. You must follow these steps:

1. Create a DatamatrixReader instance:
   
   [c#]
   DatamatrixReader reader=new DatamatrixDReader();
   
   
   
2. Load your image into an Image class (format must be PixelFormat.Format24bppRgb). The application DatamatrixSample.cs includes a method called loadImage() you can use for this purpose.
   
   [c#]
   Image image=loadImage("myFile.gif"); // see loadImage method in DatamatrixSample.cs
   
   
3. Create a RImage instance and call the scan() method of the Barcode1DReader
   
   [c#]
   DatamatrixData[] barcodes=reader.scan(new RImage(im));
   
   
4. Read the result. The DatamatrixData objects contain the following information: Value ( of the barcode) and position ( x , y).
   
   If no barcode has been found the array returned by read() will be empty.