GB1394744A - Filtering spatial frequencies - Google Patents

Filtering spatial frequencies

Info

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
Application number
GB2707672A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1394744A publication Critical patent/GB1394744A/en
Expired legal-status Critical Current

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 OR CALCULATING; 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 OR CALCULATING; 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 Analysis (AREA)
  • Image Processing (AREA)
GB2707672A 1971-06-12 1972-06-09 Filtering spatial frequencies Expired GB1394744A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7108091A NL7108091A (enrdf_load_stackoverflow) 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 (enrdf_load_stackoverflow)
DE (1) DE2226260A1 (enrdf_load_stackoverflow)
FR (1) FR2141815B3 (enrdf_load_stackoverflow)
GB (1) GB1394744A (enrdf_load_stackoverflow)
NL (1) NL7108091A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2297432A1 (fr) * 1975-01-09 1976-08-06 Fleuret Jacques Perfectionnements aux dispositifs de traitement d'images optiques

Cited By (3)

* Cited by examiner, † Cited by third party
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
FR2141815B3 (enrdf_load_stackoverflow) 1975-08-08
FR2141815A1 (enrdf_load_stackoverflow) 1973-01-26
NL7108091A (enrdf_load_stackoverflow) 1972-12-14
BE784751A (fr) 1972-12-12
DE2226260A1 (de) 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