| 摘要 |
A method and system for image enhancement and data-loss recovery using wavelet transforms is disclosed. In a first aspect, a method and system comprises defining a wavelet transformed image as a plurality of sections, wherein one of the sections is the original image and estimating coefficients in estimated sections of the wavelet transformed image. The coefficients are estimated for each particular estimated section using information obtained from that section. The method and system includes performing an inverse wavelet transform on the wavelet transformed image to obtain the enlarged image. In a second aspect, a method and system for creating high resolution video frames in a video sequence is disclosed: The method and system comprise defining a wavelet transformed frame as a plurality of sections, wherein one of the sections is a present video frame and estimating coefficients in estimated sections of the wavelet transformed frame. The coefficients are estimated for each particular estimated section using information from a lower level wavelet transform of a corresponding section of a past or future frame of the video sequence. The method and system also includes performing an inverse wavelet transform on the wavelet transformed frame. The wavelet transformed frame includes the present video frame and the estimated sections, to obtain a high resolution video frame having a greater resolution than the present video frame. In a third aspect, a method and system for recovering data lost from original data during transmission of the original data in a communication channel is disclosed. The method and system comprise determining the locality of the lost data in a wavelet transform tree, the wavelet transform tree having been created from the original data before transmission; determining the locality of the lost data in lower and higher levels of the wavelet transform tree and in wavelet transform quadrants corresponding to the locality of the lost data; and using information at the locality in the lower and higher levels of the wavelet transform tree to estimate the lost data. The present invention provides several methods and apparatus for providing enhanced, high resolution images and enhanced video sequences, and for recovering data lost during transmission. The techniques described allow images to be expanded in size and resolution with little loss in quality, and allows video frames to be reconstituted to create a smoother video presentation. The data recovery techniques allow lost data to be reliably reconstituted and allow the most important data to be transmitted with little loss. |
