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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. - PowerPoint PPT Presentation
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Barcode Readers using the Camera Device in Mobile
Phones
指導教授:張元翔 老師學生:吳思穎 99770032011/05/25
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.
Introduction
Systems
Execute the barcode reader application
Capture from embedded camera device
Process the image in DSP
Decode the code
Display the results
Systems
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 black-white 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
Algorithms
Implementations&
Experimental Results
Implementations &Experimental Results
Thank you for your attention !!!
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