US4489390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spatial filter system
Assignee: Massachusetts Institute of Technology
•
Filing: 1981-03-20
•
Granted: 1984-12-18
•
Expires: 2001-03-20
Abstract
Abstract A spatial filter system for filtering a matrix of data values by an m×n matrix, where the m×n matrix is the product of a 1×n matrix and a m×a matrix. The system includes a first spatial filter adapated to filter each row of the data matrix with the 1×m matrix to provide a first filtered value matrix. The system also includes a second spatial filter adapted to filter each column of the first filtered value matrix with the m×1 matrix to provide a second filtered value matrix.
Inventors
- 👤 Ronald R. Parenti
- 👤 William E. Keicher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:25
CPC Classifications
H; H03; H03H; H03H15/00; H03H15/02; G; G01; G01S; G01S3/00; G01S3/78; G01S3/781
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
195 words
A spatial filter system for image data processing to enhance an image, the system comprising: A. a linear array of detector elements, each detector element generating a column of data values, the array being adapted for scanning along one dimension to generate a succession of rows of data values thereby defining a matrix having a plurality of columns and rows: B. a first filter means connected to the array to receive the rows of data values in succession and process the data values of each row in parallel to generate a first-filtered value matrix; C. a first summing means connected to the first filter means for summing the data values of the first-filtered value matrix to generate a succession of summed data columns from said first-filtered value matrix; D. a second filter means connected to the first summing means for filtering the summed columns in succession to generate a second filtered value matrix; and E. a second summing means for summing the data values of the second-filtered value matrix, wherein the first and second filter means are chosen such that their multiplicative product form a two-dimensional spatial filter of the original matrix of data values.
Claim 2
Dependent Claim
195 words
A spatial filter system for image data processing to enhance an image, the system comprising: A. a linear array of detector elements, each detector element generating a column of data values, the array being adapted for scanning along one dimension to generate a succession of rows of data values thereby defining a matrix having a plurality of columns and rows: B. a first filter means connected to the array to receive the rows of data values in succession and process the data values of each row in parallel to generate a first-filtered value matrix; C. a first summing means connected to the first filter means for summing the data values of the first-filtered value matrix to generate a succession of summed data columns from said first-filtered value matrix; D. a second filter means connected to the first summing means for filtering the summed columns in succession to generate a second filtered value matrix; and E. a second summing means for summing the data values of the second-filtered value matrix, wherein the first and second filter means are chosen such that their multiplicative product form a two-dimensional spatial filter of the original matrix of data values.
Claim 3
Dependent Claim
13 words
The system of claim 1 wherein the spatial filter is a Laplacian filter.
Claim 4
Dependent Claim
31 words
The system of claim 1 wherein the first and second filter means further comprise split electrode, charge-coupled device arrays and the filtering function is accomplished by weighting of the split electrodes.
Claim 5
Dependent Claim
17 words
The system of claim 1 wherein the detector elements comprise infra-red detectors mounted in an evacuated dewar.
Claim 6
Dependent Claim
13 words
The system of claim 4 wherein the detector elements further comprise mercury-cadmium-telluride sensors.
Claim 7
Dependent Claim
21 words
The system of claim 1 wherein the spatial filter is a Laplacian filter in the form of a fourth derivative operator.
References Cited (Backward Citations)
US3997973A
Cited
US3971922A
Cited
US4045795A
Cited
US4092618A
Cited
US4194221A
Cited
US4267580A
Cited
US4264983A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-18 | 1988-06-18 | 1988-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-18 | 1992-06-18 | 1992-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-18 | 1996-06-18 | 1996-12-18 | $7700.00 | Window Closed / Lapsed |