US6005983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image enhancement by non-linear extrapolation in frequency space
Assignee: California Institute of Technology
•
Filing: 1997-09-16
•
Granted: 1999-12-21
•
Expires: 2017-09-16
Abstract
Abstract An input image is enhanced to include spatial frequency components having frequencies higher than those in an input image. To this end, an edge map is generated from the input image using a high band pass filtering technique. An enhancing map is subsequently generated from the edge map, with the enhanced map having spatial frequencies exceeding an initial maximum spatial frequency of the input image. The enhanced map is generated by applying a non-linear operator to the edge map in a manner which preserves the phase transitions of the edges of the input image. The enhanced map is added to the input image to achieve a resulting image having spatial frequencies greater than those in the input image. Simplicity of computations and ease of implementation allow for image sharpening after enlargement and for real-time applications such as videophones, advanced definition television, zooming, and restoration of old motion pictures.
Inventors
- 👤 Charles H. Anderson
- 👤 Hayit K. Greenspan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:38
CPC Classifications
G; G06; G06T; G06T5/00; G06T5/73; G06T5/75
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
107 words
A video signal enhancing apparatus for enhancing an input image contained in an input video signal, wherein the input image has spatial frequency components up to a maximum spatial frequency, comprising: means for receiving a video signal containing the input image; means for generating an edge map from the input image; means for generating an enhancing map from the edge map, by applying an operator which preserves phase characteristics of the edge map and which generates spatial frequencies exceeding the maximum spatial frequency; means for applying the enhanced map to the input image to generate an enhanced image for display; and means for displaying the enhanced image.
Claim 2
Dependent Claim
107 words
A video signal enhancing apparatus for enhancing an input image contained in an input video signal, wherein the input image has spatial frequency components up to a maximum spatial frequency, comprising: means for receiving a video signal containing the input image; means for generating an edge map from the input image; means for generating an enhancing map from the edge map, by applying an operator which preserves phase characteristics of the edge map and which generates spatial frequencies exceeding the maximum spatial frequency; means for applying the enhanced map to the input image to generate an enhanced image for display; and means for displaying the enhanced image.
Claim 3
Dependent Claim
21 words
The video signal enhancing apparatus of claim 1, wherein the means for generating an edge map comprises a Burt pyramid device.
Claim 4
Dependent Claim
21 words
The video signal enhancing apparatus of claim 1, wherein the means for generating an edge map comprises an FSD pyramid device.
Claim 5
Dependent Claim
21 words
The video signal enhancing apparatus of claim 1, wherein the means for generating an edge map comprises a band pass filter.
Claim 6
Dependent Claim
21 words
The video signal enhancing apparatus of claim 1, wherein the operator is a non-linear operator multiplied by a preselected positive constant.
Claim 7
Dependent Claim
102 words
The video signal enhancing apparatus of claim 5, wherein the edge map is represented by L 0 and wherein the non-linear operator is: a preselected second constant T, for values of the edge map L 0 greater than the preselected constant T; a negative of the constant T, for values of the edge map L 0 less than the negative of the preselected constant T; and a value of the edge map L 0 , for values of the edge map L 0 greater than the negative of the preselected constant T and less than the positive of the preselected constant T.
Claim 8
Dependent Claim
53 words
The video signal enhancing apparatus of claim 5, wherein the edge map is represented by L 0 and wherein the non-linear operator is defined by a bounding function BOUND (L 0 ) wherein ##EQU2## and wherein S is a value of a portion of L 0 and T is a second preselected constant.
Claim 9
Dependent Claim
24 words
The video signal enhancing apparatus of claim 1, wherein the means for receiving the video signal further includes means for digitizing the video signal.
Claim 10
Dependent Claim
101 words
An advanced definition television receiving set for receiving a television signal containing an original image and displaying an enhanced version of the original image, the advanced definition television receiving set comprising: means for expanding images by a preselected image expansion factor; means for generating an edge map from the input image; means generating an enhancing map from the edge map, by applying an operator which preserves phase characteristics of the edge map and which genetes spatial frequencies exceeding the initial maximum spatial frequency; and means for applying the enhanced map to the input image to generate an enhancing image for display.
Claim 11
Dependent Claim
101 words
An advanced definition television receiving set for receiving a television signal containing an original image and displaying an enhanced version of the original image, the advanced definition television receiving set comprising: means for expanding images by a preselected image expansion factor; means for generating an edge map from the input image; means generating an enhancing map from the edge map, by applying an operator which preserves phase characteristics of the edge map and which genetes spatial frequencies exceeding the initial maximum spatial frequency; and means for applying the enhanced map to the input image to generate an enhancing image for display.
Claim 12
Dependent Claim
22 words
The advanced definition television receiving set of claim 9, wherein the means for generating an edge map comprises a Burt pyramid device.
Claim 13
Dependent Claim
22 words
The advanced definition television receiving set of claim 9, wherein the means for generating an edge map comprises an FSD pyramid device.
Claim 14
Dependent Claim
22 words
The advanced definition television receiving set of claim 9, wherein the means for generating an edge map comprises a band pass filter.
References Cited (Backward Citations)
US4399461A
Cited
US4661986A
Cited
US4674125A
Cited
US4523230A
Cited
US4736448A
Cited
US4718104A
Cited
US5231677A
Cited
US4692806A
Cited
US4698843A
Cited
US4709394A
Cited
US5029227A
Cited
US4797942A
Cited
US4987480A
Cited
US5526446A
Cited
US5179441A
Cited
US5276513A
Cited
US5717789A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-12-20 | 2003-06-21 | 2003-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-12-20 | 2007-06-21 | 2007-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-12-20 | 2011-06-21 | 2011-12-21 | $7700.00 | Window Closed / Lapsed |