Name
Abstract | ||
|---|---|---|
One of the major drawbacks of orthogonal wavelet transforms is their lack of translation invariance: the content of wavelet subbands is unstable under translations of the input signal. Wavelet transforms are also unstable with respect to dilations of the input signal and, in two dimensions, rotations of the input signal. The authors formalize these problems by defining a type of translation invariance called shiftability. In the spatial domain, shiftability corresponds to a lack of aliasing; thus, the conditions under which the property holds are specified by the sampling theorem. Shiftability may also be applied in the context of other domains, particularly orientation and scale. Jointly shiftable transforms that are simultaneously shiftable in more than one domain are explored. Two examples of jointly shiftable transforms are designed and implemented: a 1-D transform that is jointly shiftable in position and scale, and a 2-D transform that is jointly shiftable in position and orientation. The usefulness of these image representations for scale-space analysis, stereo disparity measurement, and image enhancement is demonstrated.<> |
Year | DOI | Venue |
|---|---|---|
1992 | 10.1109/18.119725 | IEEE Transactions on Information Theory - Part 2 |
Keywords | Field | DocType |
filtering and prediction theory,picture processing,signal processing,transforms,1-D transform,image enhancement,jointly shiftable,multiscale transforms,orientation domain,orthogonal wavelet transforms,sampling theorem,scale domain,scale-space analysis,shiftability,shiftable transforms,signal analysis,spatial domain,stereo disparity measurement,translation invariance,wavelet subbands | Orthogonal wavelet,Discrete mathematics,Computer science,Image processing,Filter (signal processing),Stereophotography,Aliasing,Nyquist–Shannon sampling theorem,Wavelet transform,Wavelet | Journal |
Volume | Issue | ISSN |
38 | 2 | 0018-9448 |
Citations | PageRank | References |
556 | 265.34 | 19 |
Authors | ||
4 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Eero Simoncelli | 1 | 1316 | 397.43 |
| William T. Freeman | 2 | 17382 | 1968.76 |
| Adelson | 3 | 3586 | 937.81 |
| Heeger, D.J. | 4 | 1223 | 438.76 |