GB1394744A - Filtering spatial frequencies - Google Patents
Filtering spatial frequenciesInfo
- Publication number
- GB1394744A GB1394744A GB2707672A GB2707672A GB1394744A GB 1394744 A GB1394744 A GB 1394744A GB 2707672 A GB2707672 A GB 2707672A GB 2707672 A GB2707672 A GB 2707672A GB 1394744 A GB1394744 A GB 1394744A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filtered
- filter
- transform
- give
- plane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/46—Systems using spatial filters
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06E—OPTICAL COMPUTING DEVICES; COMPUTING DEVICES USING OTHER RADIATIONS WITH SIMILAR PROPERTIES
- G06E3/00—Devices not provided for in group G06E1/00, e.g. for processing analogue or hybrid data
- G06E3/001—Analogue devices in which mathematical operations are carried out with the aid of optical or electro-optical elements
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/88—Image or video recognition using optical means, e.g. reference filters, holographic masks, frequency domain filters or spatial domain filters
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Optics & Photonics (AREA)
- Multimedia (AREA)
- Mathematical Physics (AREA)
- Nonlinear Science (AREA)
- Image Processing (AREA)
- Image Analysis (AREA)
Abstract
1394744 Spatial filtering; television PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 9 June 1972 [12 June 1971] 27076/72 Heading H4F Spatial filtering of a transparent object 10 is effected by opening a Fourier transform of the object using coherent light 5, locating a spatial filter 12 in the transform plane, separating out images filtered in different manner, treating the filtered images as at 25, 26 and mixing the treated filtered images to give a single output display 28. A beam splitter 22 may be used to give two transform spectrums of the object; a filter, e.g. 12 may be located only in one transform plane, or each transform plane may have an appropriate filter. The filtered signals are fed to television cameras 23, 24 and processed in modulators 25, 26. If desired only one transform plane may be used with the beam splitters and cameras located after that plane. Alternatively only one camera may be used and the first filtered function stored for processing and mixing with a second filtered function at a later time. The single camera may be for colour and the wavelength of the coherent light adjustable. The filter may be optical and comprises two opposed wedge-shaped portions disposed symmetrical about the optical axis with a central portion permitting passage unaltered of the zero order. Two such wedge filters may be used and may be rotated relative to each other to give a variable filter function.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7108091A NL7108091A (en) | 1971-06-12 | 1971-06-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1394744A true GB1394744A (en) | 1975-05-21 |
Family
ID=19813371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2707672A Expired GB1394744A (en) | 1971-06-12 | 1972-06-09 | Filtering spatial frequencies |
Country Status (5)
| Country | Link |
|---|---|
| BE (1) | BE784751A (en) |
| DE (1) | DE2226260A1 (en) |
| FR (1) | FR2141815B3 (en) |
| GB (1) | GB1394744A (en) |
| NL (1) | NL7108091A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2133656A (en) * | 1983-01-13 | 1984-07-25 | John K Grady | Multiple x-ray image scanners |
| US5333064A (en) * | 1991-04-30 | 1994-07-26 | Scitex Corporation, Ltd. | Apparatus & method for descreening |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2297432A1 (en) * | 1975-01-09 | 1976-08-06 | Fleuret Jacques | Image processing system for transparencies holography - has laser with level and sweep control also processing laser with opto electric deflector |
-
1971
- 1971-06-12 NL NL7108091A patent/NL7108091A/xx unknown
-
1972
- 1972-05-30 DE DE19722226260 patent/DE2226260A1/en active Pending
- 1972-06-09 GB GB2707672A patent/GB1394744A/en not_active Expired
- 1972-06-09 FR FR7220895A patent/FR2141815B3/fr not_active Expired
- 1972-06-12 BE BE784751A patent/BE784751A/en unknown
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2133656A (en) * | 1983-01-13 | 1984-07-25 | John K Grady | Multiple x-ray image scanners |
| US5333064A (en) * | 1991-04-30 | 1994-07-26 | Scitex Corporation, Ltd. | Apparatus & method for descreening |
| US5384648A (en) * | 1991-04-30 | 1995-01-24 | Scitex Corporation Ltd. | Apparatus and method for descreening |
Also Published As
| Publication number | Publication date |
|---|---|
| NL7108091A (en) | 1972-12-14 |
| BE784751A (en) | 1972-12-12 |
| FR2141815A1 (en) | 1973-01-26 |
| FR2141815B3 (en) | 1975-08-08 |
| DE2226260A1 (en) | 1972-12-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |