Transcribed
Barcode Scanning 101: How to Decode Code39 and Code128?
Linear Barcode Recognition 1. Location Scan the entire width Search for black/white patterns Result : L Regions of Interest 2. Decoding Step 1. Count and compare image pixels Result : Relative width / location of the bars and the white spaces Step 2. Match start and end identifiers Result : Barcode Type Step 3. Interpret patterns between the start and end identifiers based on that code type's specifications Result : Numeral or character, along with check characters By Dynamsoft Barcode Reader Team
Barcode Scanning 101: How to Decode Code39 and Code128?
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Wanna understand how a barcode recognition SDK or software interprets a barcode? We’ve worked out an infographic to get you started.
To decode information from Code39, Code128 and other linear bar ...
codes, there are generally two steps: location and decoding.
Step 1. Location
First, a barcode SDK scans the entire width of an image trying to identify whether there are bar code candidates.
It searches for black/white patterns.
At the end of this step, the barcode API has Regions of Interest detected.
Step 2. Decoding
In this step, the barcode scanning sdk tries to understand the encoded information.
Count and compare image pixels
Match start and end identifiers
Interpret patterns between the start and end identifiers based on that code type’s specifications
Source
http://www.d...ading-101/Category
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