服务承诺
资金托管
原创保证
实力保障
24小时客服
使命必达
51Due提供Essay，Paper，Report，Assignment等学科作业的代写与辅导，同时涵盖Personal Statement，转学申请等留学文书代写。
51Due将让你达成学业目标51Due将让你达成学业目标51Due将让你达成学业目标51Due将让你达成学业目标私人订制你的未来职场 世界名企，高端行业岗位等 在新的起点上实现更高水平的发展
积累工作经验
多元化文化交流
专业实操技能
建立人际资源圈Compression_Techniques
2013-11-13 来源: 类别: 更多范文
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 ROIs 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
