Title :
Image representation by compressed sensing
Author :
Han, Bing ; Wu, Feng ; Wu, Dapeng
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Florida, Gainesville, FL
Abstract :
This paper addresses the image representation problem in visual sensor networks. We propose a new image representation scheme based on compressive sensing (CS) because compressive sensing is capable of reducing computational complexity of an image/video encoder. In our scheme, the encoder first decomposes the input image into two components, i.e., dense and sparse components; then the dense component is encoded by the traditional approach while the sparse component is encoded by a CS technique. To improve the rate distortion performance, we leverage the strong correlation between dense and sparse components. Given the measurements and the prediction of the sparse component, we use projection onto convex set (POCS) to reconstruct the sparse component. Our method considerably reduces the number of random measurements needed and decoding computational complexity, compared to the existing CS methods.
Keywords :
computational complexity; correlation methods; data compression; decoding; image coding; image reconstruction; image representation; image sensors; rate distortion theory; sparse matrices; compressed sensing; computational complexity; correlation methods; decoding; image encoder; image reconstruction; image representation; projection onto convex set; rate distortion theory; sparse matrix; video encoder; visual sensor networks; Compressed sensing; Computational complexity; Decoding; Distortion measurement; Image coding; Image reconstruction; Image representation; Image sensors; Rate-distortion; Video compression; Compressed Sensing; Convex optimization; Image representation; Random sampling;
Conference_Titel :
Image Processing, 2008. ICIP 2008. 15th IEEE International Conference on
Conference_Location :
San Diego, CA
Print_ISBN :
978-1-4244-1765-0
Electronic_ISBN :
1522-4880
DOI :
10.1109/ICIP.2008.4712012