Fast thumbnail generation in integer DCT domain for H.264/AVC

In this paper, we propose a simple and efficient method for generating a thumbnail or 1/4 reduced-size image in integer Discrete Cosine Transform (DCT) domain for H.264/AVC video streams. To accomplish this, we first obtain the integer DCT coefficients of a prediction residual using a newly-defined...

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Bibliographic Details
Published inIEEE transactions on consumer electronics Vol. 57; no. 2; pp. 589 - 596
Main Authors Kim, Myounghoon, Lee, Hoonjae, Sull, Sanghoon
Format Journal Article
LanguageEnglish
Published IEEE 01.05.2011
Subjects
1/4 reduced-size image
Discrete cosine transforms
Equations
H.264/AVC
intra frame
Matrix decomposition
Pixel
Streaming media
thumbnail
Transform coding
transform domain intra prediction
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Summary:In this paper, we propose a simple and efficient method for generating a thumbnail or 1/4 reduced-size image in integer Discrete Cosine Transform (DCT) domain for H.264/AVC video streams. To accomplish this, we first obtain the integer DCT coefficients of a prediction residual using a newly-defined re-scaling operation of inverse quantization, and then perform a transform domain intra prediction in integer DCT domain through simplified matrix multiplication by using only shift operation and integer addition. Finally, we generate a thumbnail directly from a H.264/AVC intra frame. Experimental results demonstrate that the proposed algorithm can reduce the total computational complexity about 16% on average, while maintaining almost the same image quality as compared to the existing method.
ISSN:0098-3063
1558-4127
DOI:10.1109/TCE.2011.5955196