Mode mapping method for H.264/AVC spatial downscaling transcoding

Transcoding is a very effective method for universal media adaptation. Spatial resolution downscaling is one of the most popular transcoding applications. Although a number of transcoding methods have been proposed in the past years, they are not very suitable for the most up-to-date H.264/AVC standard due to its many new features. In this paper, a coding mode mapping method is proposed for H.264/AVC spatial downscaling transcoding. Different from the traditional schemes, the proposed method is focused on the mode decision part, which plays a key role in H.264/AVC video encoding. The mapping scheme is exploited based on the statistics and analysis that reveals the inherent relationship between the frames having the same content but with different spatial resolutions.