Image analysis – Color image processing – Image segmentation using color
Patent
1997-02-14
2000-03-07
Tran, Phuoc
Image analysis
Color image processing
Image segmentation using color
382275, 382243, 382283, G06K 900, G06K 934
Patent
active
060350601
ABSTRACT:
A method and apparatus for generating region frames from video frames are disclosed which employs an industry standard encoder to lessen the negative impact on the quality of the transmitted video sequence while consuming fewer bits. The invention utilizes image segmentation and color replacement techniques to create the region frames. Each region frame includes a subject region, zero or more previously segmented regions and zero or more non-subject regions. The subject region is defined by the pixels of the original video frame. The previously segmented regions and non-subject regions are assigned replacement pixels P.sub.n,y and C.sub.n, respectively. The replacement pixel C.sub.n is chosen to indicate a color that is not likely to be confused with any color in the subject region R.sub.n. The replacement pixels P.sub.n,y are chosen such that the compression ratio of the region frame data is maximized. Using the region frames, content based scalability can be provided without the need for special encoders and/or channels having a wider bandwidth. Also, color artifacts associated with the segmenting process are removed by color clipping or gray-level erosion.
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Chen et al., "Coding Of Subregions For Content-Based Scalable Video", IEEE Transactions On Circuits And Systems For Video Technology, vol. 7, No. 1, Feb. 1997, pp. 256-260.
Chen Tsuhan
Haskell Barin Geoffry
Swain Cassandra Turner
AT&T Corp
Tran Phuoc
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