Barcode Readers using the
Camera Device in Mobile Phones
指導教授：張元翔 老師
學生：吳思穎 9977003
2011/05/25
Introduction
Introduction
 Baseband processor：works for voice digital signal
processing, protocol control, power management
and fundamental functions.
 Application processor：works for extra application
such as movie codec, still photo codec and resizing,
and other extra applications.
Systems
Systems
 Execute the barcode reader application
 Capture from embedded camera device
 Process the image in DSP
 Decode the code
 Display the results
Algorithms
Algorithms
 Pre-processing
 Corner marks detection
 Fourth corner estimation
 Inverse perspective transformation
 Scanning of code
Algorithms
 Pre-processing：
1.
Histogram calculation to define the threshold of blackwhite boundaries.
2. Resizing of original image to reduce the calculation
costs.
3. Recognizing QR-code area, and the filtering for the
area dilatation.
Algorithms
 Corner marks detection：
Algorithms
 Fourth corner estimation：
Algorithms
 Inverse perspective transformation：
Algorithms
Implementations
&
Experimental Results
Implementations &
Experimental Results
Thank you for your
attention !!!