GB2278750A - Optical spatial filtering with electronic image compression - Google Patents

Optical spatial filtering with electronic image compression Download PDF

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Publication number
GB2278750A
GB2278750A GB9311352A GB9311352A GB2278750A GB 2278750 A GB2278750 A GB 2278750A GB 9311352 A GB9311352 A GB 9311352A GB 9311352 A GB9311352 A GB 9311352A GB 2278750 A GB2278750 A GB 2278750A
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GB
United Kingdom
Prior art keywords
image compression
spatial filter
optical spatial
compression encoding
encoding system
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.)
Withdrawn
Application number
GB9311352A
Other versions
GB9311352D0 (en
Inventor
Kennith Neville Burgin
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.)
MOTION MEDIA TECHN Ltd
Original Assignee
MOTION MEDIA TECHN 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 MOTION MEDIA TECHN Ltd filed Critical MOTION MEDIA TECHN Ltd
Priority to GB9311352A priority Critical patent/GB2278750A/en
Publication of GB9311352D0 publication Critical patent/GB9311352D0/en
Publication of GB2278750A publication Critical patent/GB2278750A/en
Withdrawn legal-status Critical Current

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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

The image compression encoding system comprises a lens 1, an imaging CCD 3, an image compression encoding circuit 5 and an optical spatial filter 2 in place of the electronic spatial filter commonly used in bandwidth compression systems, so reducing the complexity and cost of the circuitry. The filter 2 may be on either side of, or included within, the lens 1, or on a reflective surface within the optical path. <IMAGE>

Description

FILTERING TECHNIQUE FOR USE it S WITCH IMAGE COMPRESSION ENCODING This invention relates to the use of optical filtering to improve the quality of images passed through a system employing image compression.
Image Compression is used to reduce the bandwidth or memory normally required to send or store video images.
Many of the current techniques rely on mathematical algorithms which require the incoming video to be preconditioned prior to compression. The usual technique is to pass the incoming signal through a digital signal processing device which performs this function electronically. The filter or preconditioning function usually needs to apply both in the horizontal and vertical dimensions of the image and this necessitates the use of line stores to store a number of lines from the video source. This technique is therefore relatively expensive as the silicon devices tend to be complex and large.
The invention described herein provides an alternative technique for performing the preconditioning or filtering function normally carried out by electronic circuits.
According to the present invention there is provided an image compression encoding system comprising a lens, an optical spatial filter to perform a preconditioning or filtering function, a television camera and an electronic image compression encoding circuit.
A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawing.
Referring to the drawing the image compression system comprises a lens 1, an optical spatial filter 2, a CCD or other picture sensor 3, a camera electronics circuit 4, an image compression encoder circuit 5 with a compressed data output port 6.
The purpose of the optical spatial filter 2 is to significantly simplify and reduce the cost of the electronics contained within the image compression circuit 5.

Claims (11)

C LIA I MS
1 An image compression encoding system comprising a lens, an optical spatial filter to perform a preconditioning or filtering function, a television camera and an electronic image compression encoding circuit.
2 An image compression encoding system as claimed in claim 1 wherein the optical spatial filter is placed between the lens and the CCD or other picture sensing device of the camera.
3 An image compression encoding system as claimed in claim 1 wherein the optical spatial filter is placed in front of the lens.
4 An image compression encoding system as claimed in claim 1 wherein the optical spatial filter is attached to the lens.
5 An image compression encoding system as claimed in claim 1 wherein the optical spatial filter is effected within the lens.
6 An image compression encoding system as claimed in claim 1 wherein the optical spatial filter is etched or formed on either or both surfaces of the lens.
7 An image compression encoding system as claimed in claim 1 wherein the optical spatial filter is attached to the CCD or picture sensing device of the camera.
8 An image compression encoding system as claimed in claim 7 wherein the optical spatial filter is formed on one surface of a material where the thickness of the material is used to correctly space the optical spatial filter from the CCD or picture sensing device.
9 An image compression encoding system as claimed in claim2, claim 3 and claim 4 wherein the optical spatial filter is formed on one surface of a material where the thickness of the material is used to correctly space the optical spatial filter from the lens.
10 An image compress ion encoding system as claimed in claim 1 wherein the optical spatial filter is etched, formed or attached to a reflective surface anywhere within the optical path.
11 An image compression encoding system wherein any combination of the preceding claims are used to perform the overall desired function.
GB9311352A 1993-06-02 1993-06-02 Optical spatial filtering with electronic image compression Withdrawn GB2278750A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9311352A GB2278750A (en) 1993-06-02 1993-06-02 Optical spatial filtering with electronic image compression

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9311352A GB2278750A (en) 1993-06-02 1993-06-02 Optical spatial filtering with electronic image compression

Publications (2)

Publication Number Publication Date
GB9311352D0 GB9311352D0 (en) 1993-07-21
GB2278750A true GB2278750A (en) 1994-12-07

Family

ID=10736488

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9311352A Withdrawn GB2278750A (en) 1993-06-02 1993-06-02 Optical spatial filtering with electronic image compression

Country Status (1)

Country Link
GB (1) GB2278750A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6842297B2 (en) 2001-08-31 2005-01-11 Cdm Optics, Inc. Wavefront coding optics
US6873733B2 (en) 2001-01-19 2005-03-29 The Regents Of The University Of Colorado Combined wavefront coding and amplitude contrast imaging systems
US6911638B2 (en) 1995-02-03 2005-06-28 The Regents Of The University Of Colorado, A Body Corporate Wavefront coding zoom lens imaging systems
US7218448B1 (en) 1997-03-17 2007-05-15 The Regents Of The University Of Colorado Extended depth of field optical systems
US7732750B2 (en) 1995-02-03 2010-06-08 The Regents Of The University Of Colorado Wavefront coding interference contrast imaging systems
US20150030257A1 (en) * 2013-07-23 2015-01-29 Nvidia Corporation Low-complexity bilateral filter (bf) implementation in a data processing device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0038557A2 (en) * 1980-04-18 1981-10-28 Victor Company Of Japan, Ltd. Optical low-pass filter
EP0250147A2 (en) * 1986-06-19 1987-12-23 Polaroid Corporation Electro-optical imaging apparatus
US4998800A (en) * 1988-04-04 1991-03-12 Nippon Hoso Kyokai Optical low pass filter
EP0449325A2 (en) * 1990-03-30 1991-10-02 Canon Kabushiki Kaisha Optical low-pass filter
EP0531926A1 (en) * 1991-09-10 1993-03-17 Matsushita Electric Industrial Co., Ltd. Wavelength-selective phasegrating optical low-pass filter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0038557A2 (en) * 1980-04-18 1981-10-28 Victor Company Of Japan, Ltd. Optical low-pass filter
EP0250147A2 (en) * 1986-06-19 1987-12-23 Polaroid Corporation Electro-optical imaging apparatus
US4998800A (en) * 1988-04-04 1991-03-12 Nippon Hoso Kyokai Optical low pass filter
EP0449325A2 (en) * 1990-03-30 1991-10-02 Canon Kabushiki Kaisha Optical low-pass filter
EP0531926A1 (en) * 1991-09-10 1993-03-17 Matsushita Electric Industrial Co., Ltd. Wavelength-selective phasegrating optical low-pass filter

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6911638B2 (en) 1995-02-03 2005-06-28 The Regents Of The University Of Colorado, A Body Corporate Wavefront coding zoom lens imaging systems
US7436595B2 (en) 1995-02-03 2008-10-14 The Regents Of The University Of Colorado Extended depth of field optical systems
US7732750B2 (en) 1995-02-03 2010-06-08 The Regents Of The University Of Colorado Wavefront coding interference contrast imaging systems
US8004762B2 (en) 1995-02-03 2011-08-23 The Regents Of The University Of Colorado, A Body Corporate Extended depth of field optical systems
US7218448B1 (en) 1997-03-17 2007-05-15 The Regents Of The University Of Colorado Extended depth of field optical systems
US6873733B2 (en) 2001-01-19 2005-03-29 The Regents Of The University Of Colorado Combined wavefront coding and amplitude contrast imaging systems
US6842297B2 (en) 2001-08-31 2005-01-11 Cdm Optics, Inc. Wavefront coding optics
US20150030257A1 (en) * 2013-07-23 2015-01-29 Nvidia Corporation Low-complexity bilateral filter (bf) implementation in a data processing device
US8983223B2 (en) * 2013-07-23 2015-03-17 Nvidia Corporation Low-complexity bilateral filter (BF) implementation in a data processing device

Also Published As

Publication number Publication date
GB9311352D0 (en) 1993-07-21

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)