Journal of Korea Multimedia Society (한국멀티미디어학회논문지)

Korea Multimedia Society (한국멀티미디어학회)
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A Fast Implementation of JPEG and Its Application to Multimedia Service in Mobile Handset

  • Jeong Gu-Min (School of Electrical Engineering, Kookmin University) ;
  • Jung Doo-Hee (Dept. of Electrical and Electronics Engineering, Korea Polytechnic University) ;
  • Na Seung-Won (Terminal Development Team, SK Telecom.) ;
  • Lee Yang-Sun (Department of Computer Engineering, SeoKyeong University)
  • Published : 2005.12.01
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Abstract

In this paper, a fast implementation of JPEG is discussed and its application to multimedia service is presented for mobile wireless internet. A fast JPEG player is developed based on several fast algorithms for mobile handset. In the color transformation, RCT is adopted instead of ICT for JPEG source. For the most time-consuming DCT part, the binDCT can reduce the decoding time. In upsampling and RGB conversion, the transformation from YCbCr to RGB 16 bit is made at one time. In some parts, assembly language is applied for high-speed. Also, an implementation of multimedia in mobile handset is described using MJPEG (Motion JPEG) and QCELP(Qualcomm Code Excited Linear Prediction Coding). MJPEG and QCELP are used for video and sound, which are synchronized in handset. For the play of MJPEG, the decoder is implemented as a S/W upon the MSM 5500 baseband chip using the fast JPEG decoder. For the play of QCELP, the embedded QCELP player in handset is used. The implemented multimedia player has a fast speed preserving the image quality.

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