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Researches on Image Coding System for Image Communication

Author: DingGuiGuang
Tutor: GuoBaoLong
School: Xi'an University of Electronic Science and Technology
Course: Signal and Information Processing
Keywords: Image Communication Image Coding Wavelet Transform EZW
CLC: TN919.81
Type: Master's thesis
Year: 2002
Downloads: 228
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Abstract


Digital image transmission system, since the limited channel bandwidth , to achieve real-time digital video transmission , must have a good image compression algorithm to a large effective digital video data compression, so efficiency of image encoding and decoding system has an important practical value . In recent years , the wavelet transform for image compression has achieved great success , including Analog Devices ADV611 is developed based on wavelet transform image codec chip . In this paper, based on ADV611 with ADSP2185 as the core control chip, developed a set can be used for wireless transmission of image encoding and decoding system . The system supports both PAL and NTSC system analog video input, digitized video data are consistent with CCIR-656 standard , compressed video data bit rate of 9600bps to 6.144Mbps transmission, support a field / 2 seconds to 60 fields / sec field rate adjustment and support QQCIF, QCIF, CIF and Full and other image resolution. The system solves the communication of digital image compression in the source , the image quality guaranteed under the premise that the compressed video data to meet the requirements of the wireless communication . Meanwhile, with a region of interest image compression algorithm is discussed and research, and to EZW (Embedded Zerotree Wavelet) algorithm is proposed based on a kind of region of interest image coding and decoding algorithm, referred to as having a region of interest Embed EZW coding algorithm ( referred EZW_ROI). The algorithm of interest region image and the background image using different compression step , the image of the region of interest than the background image with better image quality , the test proved that the high compression ratio case, the image reconstruction algorithm ratio EZW image reconstruction algorithm has better visual effect.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Image communication, multimedia communication > Image coding
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