Abstract
We have developed a new video coding method called adaptive picture direction inversion coding (APDIC) that improves coding efficiency by utilizing the dependency of the spatial direction of images in intra/inter coding. This method involves inverting the direction of input pictures horizontally and/or vertically, and then selecting the best pattern by using a rate-distortion optimization method. Decoders can identify the selected inverting pattern by using an invert flag in the bitstream so that they can decode the sequence in the right position. We implemented APDIC into a H.264/AVC based video encoder. The experimental results show that the bitrate obtained using this method is reduced by up to 4.3% for natural image sequences and 7.6% for the most typical artificial images.
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