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Home > Reference > Research and information: general > Research methods: general > A Comparison of Model-Based Vq Compression with Other Vq Approaches
A Comparison of Model-Based Vq Compression with Other Vq Approaches

A Comparison of Model-Based Vq Compression with Other Vq Approaches


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About the Book

In our previous work on Model-Based Vector Quantization (MVQ), we presented some performance comparisons (both rate distortion and decompression time) with VQ and JPEG/DCT. In this paper, we compare the MVQ's rate distortion performance with Mean Removed Vector Quantization (MRVQ) and include our previous comparison with VQ. MVQ is similar to MRVQ in many ways. Both of these techniques extract means of the vectors (raster-scanned image blocks) and reduce them to mean removed residuals by subtracting block means from the elements of the vectors. In the case of MRVQ, a codebook of residual vectors is generated using a training set. For every vector from the input image, the block mean and address of the codevector from the codebook that matches the input vector closest are transmitted to the decoder. The codebook is generated using generalized Lloyd algorithm on training set of residual vectors. For MVQ the pairs consist of vector means and address of the closest matching vector from codebook generated by models based on statistical properties of the residuals and Human Visual System (HVS). In our experiments, we found that MVQ performance in rate distortion sense is almost always better than VQ and is comparable to MRVQ. Further, MVQ is much easier to use than either VQ or MRVQ, since the training and managing of explicit codebooks is not required. Manohar, Mareboyana and Tilton, James C. Goddard Space Flight Center NASA-TM-111107, NAS 1.15:111107 ...


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Product Details
  • ISBN-13: 9781724981868
  • Publisher: Createspace Independent Publishing Platform
  • Publisher Imprint: Createspace Independent Publishing Platform
  • Height: 279 mm
  • No of Pages: 28
  • Spine Width: 2 mm
  • Width: 216 mm
  • ISBN-10: 1724981862
  • Publisher Date: 09 Aug 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 91 gr


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