mpeg - AnIntroductiontoMPEG SchoolofComputerScience,

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June, 1999    An Introduction to MPEG School of Computer Science,  University of Central Florida, VLSI and M-5 Research Group Tao Tao
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    Motion  JPEG JPEG system for compressing static images could  be applied to a sequence of images, compressing  each individually, this is called  motion JPEG Motion JPEG takes no advantage of any  correlation between successive images In a typical scene there will be a great deal of  similarity between nearby images of the same  sequence.
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    In a typical scene there will be a great deal of similarity  between nearby images of the same sequence.
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    Motion Compensation Approach Basic idea of  Motion Compensation : Many “moving” images or image sequences consist of a static  background with one or more moving foreground objects. We  can get coding advantage from this. we code the first frame by baseline JPEG and use this frame  as  reference image .  Treat the second image block by block and compare each  block with the same block in the reference image. For blocks that have identical block in reference image, we  only send a special code instead of whole code. For other blocks, we just encode them as usual.
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  Motion Compensation Approach(cont.) Motion Vectors static background is a very special case, we should  consider the displacement of the block. Motion vector is used to inform decoder exactly where in  the previous image to get the data. Motion vector would be zero for a static background.
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mpeg - AnIntroductiontoMPEG SchoolofComputerScience,

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