| Summary: | 碩士 === 國立中正大學 === 電機工程所 === 97 === Nowadays, many handheld multimedia devices have the capability of watching TV programs. However, such handheld devices are restricted to low-resolution display screens. Accordingly, the frame size of videos must be downscaled before displaying. The conventional methods that include the inverse transform and spatial-domain frame-size downscaling consume large computational complexities. Hence, frequency-domain frame-size downscaling method is devised to reduce the computational complexity of the inverse transform and frame-size downscaling.
In this thesis, we propose a kind of frequency-domain frame-size downscaling method which integrates the Inverse Discrete Cosine Transform (IDCT) and downscaling. Additionally, the integrated method is optimized by using two coefficient compensation manners to preserve good picture quality. The proposed integrated method based on coefficient compensation can reduce about 55% complexity of the conventional IDCT and downscaling under the same picture quality. Therefore, the proposed method can be widely used in various multimedia devices to enjoy high-quality video displaying under a low computational complexity.
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