منابع مشابه
Fast algorithm for the 3D DCT
The three-dimensional discrete cosine transform (3D DCT) has been used in many 3-D applications such as video coding and compression. Many fast algorithms have been developed for the calculation of 1-D DCT. These algorithms are then used for the calculation of 3-D DCT using the row-column approach. However, 3-D algorithms involve less arithmetic operations and can be faster. In this paper, the ...
متن کاملthe algorithm for solving the inverse numerical range problem
برد عددی ماتریس مربعی a را با w(a) نشان داده و به این صورت تعریف می کنیم w(a)={x8ax:x ?s1} ، که در آن s1 گوی واحد است. در سال 2009، راسل کاردن مساله برد عددی معکوس را به این صورت مطرح کرده است : برای نقطه z?w(a)، بردار x?s1 را به گونه ای می یابیم که z=x*ax، در این پایان نامه ، الگوریتمی برای حل مساله برد عددی معکوس ارانه می دهیم.
15 صفحه اولA Fast Algorithm for DCT Domain Filtering
A method is developed and proposed to e ciently implement spatial domain ltering directly on compressed digital video and images in the discrete cosine transform (DCT) domain. It is demonstrated that the computational complexity of this method is signi cantly smaller than that of the straightforward approach, of converting back to the uncompressed domain, convolving in the spatial domain, and r...
متن کاملA Fast Algorithm for Resizing Images in the DCT Domain
Abstract For many applications such as image transmission over channels with variable bandwidths and image display on devices at different resolution levels, image resizing is widely demanding. Recently, image resizing algorithms in the compressed domain have drawn a lot of attention to computation efficiency. In this paper, an efficient image resizing algorithm based on discrete cosine transfo...
متن کاملA Fast DCT Block Smoothing Algorithm S
e o When errors are clearly visible, the blockiness of some artifacts distinguishes them from th riginal image content, suggesting a way of reducing these artifacts. Presumably, the human viewer k e identifies the artifacts by assuming the image does not have 8-pixel by 8-pixel block features. Bloc dge variance, the sum of squared differences between adjacent block edge pixels, is one simple s ...
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ژورنال
عنوان ژورنال: IEEE Transactions on Signal Processing
سال: 2004
ISSN: 1053-587X
DOI: 10.1109/tsp.2004.823472