vol16no1pa9

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Tikrit Journal of Engineering Sciences (2009) 16(1) 121- 132

DCT/DPCM Hybrid Coding for Interlaced Image Compression

Saied O. Abdul-Amir  Khamies K. Hasan
Communication & Computer Dept., Al Mansour College, Iraq Electrical Eng. Dept., Tikrit University, Iraq

Abstract

By the nature of images, picture elements in local regions are highly correlated with one another. In such cases, image compression techniques are introduced to reduce the amount of data is needed to represent the same information, either exactly or approximately. In this work DCT/DPCM hybrid approach have been designed and implemented for interlaced images. The image signal was first transformed row-wise using discrete cosine transform (DCT) and a differential pulse code modulation (DPCM) scheme then was used column-wise to get difference signal. For still images the same 3-bit quantizer was employed which makes quantization process easier. For interlaced images 3-bit quantizer was used for the odd field and 2-bit quantizer for even field, since the difference signal of the even field was very small. A compression ratios of about 13:1 was obtained for interlaced image. Objective measurements showed a high peak to peak signal to noise ratio without noticeable impairment.

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Keywords: Interlaced, Hybrid image compression, DCT/DPCM, Discarding

How to cite

TJES: Abdul-Amir SO, Hasan KK. DCT/DPCM Hybrid Coding for Interlaced Image Compression. Tikrit Journal of Eng Sciences 2009;16(1):121-132.
APA: Abdul-Amir, S. O., & Hasan, K. K. (2009). DCT/DPCM Hybrid Coding for Interlaced Image Compression. Tikrit Journal of Eng. Sciences, 16(1), 121-132.
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