To speed up the encoding process.at low bit rate, a improvement of rate control based on the basic idea of PCRD in JPEG2000 is proposed. The aim of the algorithm is to achieve equivalent performance of PCRD with less ...
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ISBN:
(纸本)0863416446
To speed up the encoding process.at low bit rate, a improvement of rate control based on the basic idea of PCRD in JPEG2000 is proposed. The aim of the algorithm is to achieve equivalent performance of PCRD with less computational complexity and smaller memory buffer at low bit rate. The main improvement exists where it determines the included coding passes of a code block before they will be encoded. Therefore, the excluded passes will never be encoded actually, which results in the fact that the computational operations and the memory of buffering the temporary bit stream would be reduced greatly. The performance of the proposed method is experimentally investigated in jasper VM software.
This paper introduces the new qualitative and quantitative methods, which can diagnose breast tumors. Qualitative methods include blood vessel display inside and outside of pathological changes part of breast, display...
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This paper introduces the new qualitative and quantitative methods, which can diagnose breast tumors. Qualitative methods include blood vessel display inside and outside of pathological changes part of breast, display of equivalent pixel curves at the part of pathological changes and display of breast tumor image edge. Accordingly, three feature extraction operators are proposed, i.e. the combination operators of anisotropic gradient and smoothing operator, an improved Sobel operator and an edge sharpening operator. Furthermore, quantitative diagnostic approaches are discussed based on blood and oxygen contents according to abundant clinical data and pathological mechanism of breast tumors. The results of clinic show that the methods of combining qualitative and quantitative diagnose are effective for breast tumor images, especially for early and potential breast cancer
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