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NASA Technical Reports Server (NTRS) 19960001484: A comparison of m... |
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by NASA Technical Reports Server (NTRS) |
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In our previous work on Model-Based Vector Quantization |
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(MVQ), we presented some performance comparisons (both |
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rate distortion and decompression time) with VQ and |
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JPEG/DCT. In this paper, we compare the MVQ's rate |
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distortion performance with Mean Removed Vector |
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Quantization (MRVQ) and include our previous comparison |
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with VQ. MVQ is similar to MRVQ in many ways. Both of |
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these techniques extract means of the vectors (raster- |
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scanned image blocks) and reduce them to mean removed |
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residuals by subtracting block means from the elements of |
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the vectors. In the case of MRVQ, a codebook of residual |
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vectors is generated using a training set. For every |
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vector from the input image, the block mean and address |
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of the codevector from the codebook that matches the |
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input vector closest are transmitted to the decoder. The |
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codebook is generated using generalized Lloyd algorithm |
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on training set of residual vectors. For MVQ the pairs |
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consist of vector means and address of the closest |
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matching vector from codebook generated by models based |
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on statistical properties of the residuals and Human |
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Visual System (HVS). In our experiments, we found that |
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MVQ performance in rate distortion sense is almost always |
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better than VQ and is comparable to MRVQ. Further, MVQ is |
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much easier to use than either VQ or MRVQ, since the |
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training and managing of explicit codebooks is not |
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required. |
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Date Published: 2016-10-08 22:40:16 |
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Identifier: NASA_NTRS_Archive_19960001484 |
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Item Size: 9370727 |
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Language: english |
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Media Type: texts |
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