Barcode Readers using the Camera Device in Mobile Phones 指導教授：張元翔 老師 學生：吳思穎 /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

Implementations & Experimental Results

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