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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ALL You Have Viewed Too Many Free Essays, Term Papers, and Book Reports. Compression Techniques Compression Techniques INTRODUCTION This research describes an image representation technique that entails progressive refinement of user specified regions of interest (ROI) of large images. Progressive refinement of original quality can be accomplished in theory. However, due to heavy burden on storage resources for our applications, we restrict the refinement to about 25% of the original data resolution. Wavelet decomposition with Vector Quantization (VQ) of the high frequency components and JPEG/DCT compression of low frequency component is used as representation framework. Our software will reconstruct the region selected by the user from its wavelet decomposition at desired resolution. Further refinement from the first preview can be obtained progressively by transmitting high frequency coefficients from low resolution to high resolution, which are compressed by variant of Vector Quantization called Model Based Vector Quantization. The user will have an option of progressive build up of the ROI’s until full resolution stored or terminate the transmission at any time during the progressive refinement. IMAGE COMPRESSION The entire architecture of the program is based on object oriented programming using C++. A multiresolution decomposition into wavelet coefficients provides the most useful image representation or image browsing. Image decomposition is done recursively into wavelet coefficients using the technique [2] shown in Figure 1. The given image is decomposed into low and high frequency bands along the rows and columns. VECTOR QUANTIZATION The high frequency subbands image, high, frequency, coefficients, wavelet, vector, using, resolution, quality, progressive, hvs, hl, hh, user, technique, subbands, refinement, reconstruction, quantization, program, mvq, low, lh, first, decomposition, compressed, components, based, vq, vectors, vector, quantization, variant, subband, shown, scalar, roi, representation, quantized, model, ll, jpeg/dct, figure, distribution, component, codebook, called, bands, about, zeros, due, zero Word Count: 471 Acceptance_Essays American_History Anatomy_&_Physiology Animal_Science_&_Zoology Anthropology Architecture Art Astronomy Aviation Biographies Book_Reports Business Computers Creative_Writing Current_Events Economics Education Engineering English Environmental_Science Ethics European_History Film_&_TV Foreign_Languages Geography Government_&_Politics Health_&_Beauty History_Other Human_Sexuality Legal_Issues Marketing Mathematics Medicine Miscellaneous Music Mythology Philosophy Physics Poetry Political_Science Psychology Religion Science Shakespeare Social_Issues Sociology Speech Sports_&_Recreation Supernatural Technology Theater Theses_&_Dissertations

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