专利名称：Method and apparatus for generating a
composite image from individualcompressed images
发明人：Marc Jay Beacken,Robert L. Doran,Paul S.
Giangrossi,Paul R. Gloudemans,Elizabeth A.Seip
申请号：US08/959580申请日：19971029公开号：US06072536A公开日：20000606
摘要：A composite image generator for generating a multi-image composite from aplurality of individual compressed images is disclosed. Multi- image composites aregenerated from static images or from a video stream with significantly reducedcomputation, reduced latency for video processing and reduced storage requirements.The individual images may be compressed with a JPEG image encoder or another suitableintraframe image encoder, such as those implementing the MPEG-II standard. In theillustrative embodiment, four (4) individual images of equal size, compressed using theJPEG standard, are combined into a multi-image composite with a single individual imagein each quadrant of the composite image. Multi-image composites are created withoutfully decoding each individual compressed image, by partially decoding the individualcompressed images and only fully decoding a small portion of each image. Multi-imagecomposites are created from N individual compressed images by initially decoding thedata of the N compressed images only enough to identify where each row of 8×8 blocks
end, so that the image data may be reordered in an appropriate manner. As each 8.times.8 block is detected, the input image data is copied to the output image data tocreate the multi-image composite. The desired composite configuration determines theorder of processing the N input images. Since each codeword may encode more than onecoefficient, and each codeword may be of variable length, detection tables preferablyindicate the number of bits encapsulated in each codeword and the number of
coefficients represented by these bits. As the input image data is evaluated, the numberof coefficients may be counted until all of the coefficients in a block have beenprocessed, or until an end-of-block codeword is detected. The DC difference values atthe border of each individual image must be recalculated to reflect the reordering of thepixels, since the DC coefficient in each block is encoded relative to the DC coefficient fromthe previous block, which will be different for certain blocks in the reordered multi-imagecomposite image.
申请人：LUCENT TECHNOLOGIES INC.
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