In this paper, we propose a method for generating
thumbnail images from the intra-sliced macroblock-adaptive
frame/field coding mode in H.264/AVC bit stream. The pixel value
of thumbnail image is combined by two elements: the average
value of residual pixels, which is extracted in the transform
domain, and the average value of estimated pixels, which is
calculated in the pixel domain. Also, the pixels only required for
the intra prediction in the pixel domain is reconstructed by using
the reduced form of inverse integer discrete cosine transform.
The thumbnail images produced by the proposed method are
indistinguishable to the ones by the method that decodes the
H.264/AVC-I slice bit streams and then scales them down. For
most of images, the proposed method also executes at least 2
times faster than the full decoding method at frequently used
bandwidths.