Abstract
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.
Original language | English |
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Article number | 5955196 |
Pages (from-to) | 589-596 |
Number of pages | 8 |
Journal | IEEE Transactions on Consumer Electronics |
Volume | 57 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2011 May |
Keywords
- 1/4 reduced-size image
- H.264/AVC
- intra frame
- thumbnail
- transform domain intra prediction
ASJC Scopus subject areas
- Media Technology
- Electrical and Electronic Engineering