CA2384485A1 - Method and apparatus for sharpening an image - Google Patents

Method and apparatus for sharpening an image Download PDF

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Publication number
CA2384485A1
CA2384485A1 CA002384485A CA2384485A CA2384485A1 CA 2384485 A1 CA2384485 A1 CA 2384485A1 CA 002384485 A CA002384485 A CA 002384485A CA 2384485 A CA2384485 A CA 2384485A CA 2384485 A1 CA2384485 A1 CA 2384485A1
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CA
Canada
Prior art keywords
luminance channel
data set
initial luminance
sharpening
channel
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.)
Granted
Application number
CA002384485A
Other languages
French (fr)
Other versions
CA2384485C (en
Inventor
Paul Lapstun
Simon Robert Walmsley
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.)
Google LLC
Original Assignee
Silverbrook Research Pty. Ltd.
Paul Lapstun
Simon Robert Walmsley
Google Inc.
Google Llc
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 Silverbrook Research Pty. Ltd., Paul Lapstun, Simon Robert Walmsley, Google Inc., Google Llc filed Critical Silverbrook Research Pty. Ltd.
Publication of CA2384485A1 publication Critical patent/CA2384485A1/en
Application granted granted Critical
Publication of CA2384485C publication Critical patent/CA2384485C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T3/00—Geometric image transformation in the plane of the image
    • G06T3/60—Rotation of a whole image or part thereof
    • G06T3/606—Rotation by memory addressing or mapping
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04528—Control methods or devices therefor, e.g. driver circuits, control circuits aiming at warming up the head
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04543—Block driving
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04563—Control methods or devices therefor, e.g. driver circuits, control circuits detecting head temperature; Ink temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04586—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads of a type not covered by groups B41J2/04575 - B41J2/04585, or of an undefined type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04591—Width of the driving signal being adjusted
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
    • B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T3/00—Geometric image transformation in the plane of the image
    • G06T3/40—Scaling the whole image or part thereof
    • G06T3/4007—Interpolation-based scaling, e.g. bilinear interpolation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T3/00—Geometric image transformation in the plane of the image
    • G06T3/40—Scaling the whole image or part thereof
    • G06T3/4015—Demosaicing, e.g. colour filter array [CFA], Bayer pattern
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T3/00—Geometric image transformation in the plane of the image
    • G06T3/60—Rotation of a whole image or part thereof
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T5/00—Image enhancement or restoration
    • G06T5/20—Image enhancement or restoration by the use of local operators
    • G06T5/73—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/387—Composing, repositioning or otherwise geometrically modifying originals
    • H04N1/3877—Image rotation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/409—Edge or detail enhancement; Noise or error suppression
    • H04N1/4092—Edge or detail enhancement
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H04N1/48—Picture signal generators
    • H04N1/486—Picture signal generators with separate detectors, each detector being used for one specific colour component
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H04N1/56—Processing of colour picture signals
    • H04N1/60—Colour correction or control
    • H04N1/6016—Conversion to subtractive colour signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/80—Camera processing pipelines; Components thereof
    • H04N23/84—Camera processing pipelines; Components thereof for processing colour signals
    • H04N23/843—Demosaicing, e.g. interpolating colour pixel values
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/10—Circuitry of solid-state image sensors [SSIS]; Control thereof for transforming different wavelengths into image signals
    • H04N25/11—Arrangement of colour filter arrays [CFA]; Filter mosaics
    • H04N25/13—Arrangement of colour filter arrays [CFA]; Filter mosaics characterised by the spectral characteristics of the filter elements
    • H04N25/134—Arrangement of colour filter arrays [CFA]; Filter mosaics characterised by the spectral characteristics of the filter elements based on three different wavelength filter elements
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/10—Image acquisition modality
    • G06T2207/10024—Color image

Abstract

A method for sharpening an image, the method including the steps of: receiving a data set indicative of the image;
extracting an initial luminance channel from the data set; sharpening the initial luminance channel to form a revised luminance channel; and incorporating the revised luminance channel into the data set. An apparatus for sharpening an image, the apparatus including: input means for receiving a data set indicative of the image;
extraction means for extracting an initial luminance channel from the data set; sharpening means for sharpening the initial luminance channel to form a revised luminance channel; and processing means for incorporating the revised luminance channel into the data set.

Claims (11)

We claim:
1. A method for sharpening an image, the method including the steps of:
receiving a data set indicative of the image;
extracting an initial luminance channel from the data set;
sharpening the initial luminance channel to form a revised luminance channel;
and incorporating the revised luminance channel into the data set, wherein the sharpening step includes the further steps of:
high-pass filtering the initial luminance channel to provide a filtered luminance channel;
and forming the revised luminance channel from the sum of the initial luminance channel and a predetermined proportion of the filtered luminance channel.
2. A method according to claim 1 wherein the extracting includes the step of deriving the initial luminance channel from the data set.
3. A method according to claim 2 wherein the data set has a red plane, a green plane and a blue plane and the method includes the step of deriving the initial luminance channel from the planes.
4. A method according to claim 1 wherein the data set includes the initial luminance channel as a separate channel and the extracting includes the step of accessing the initial luminance channel.
5. A method according to any one of the preceding claims wherein the high-pass filtering utilizes a 3 x 3 convolution kernel.
6. A method according to any one of the preceding claims wherein the high-pass filtering utilises a 5 x 5 convolution kernel.
7. A method according to any one of the preceding claims wherein the high-pass filtering utilises a 7 x 7 convolution kernel.
8. An apparatus for sharpening an image, the apparatus including:
input means for receiving a data set indicative of the image;
extraction means for extracting an initial luminance channel from the data set;
sharpening means for sharpening the initial luminance channel to form a revised luminance channel; and processing means for incorporating the revised luminance channel into the data set, wherein the sharpening means high-pass filters the initial luminance channel to provide a filtered luminance channel; and forms the revised luminance channel from the sum of the initial luminance channel and a predetermined proportion of the filtered luminance channel.
An apparatus according to claim 8 wherein the extraction means derives the initial luminance channel from the data set.
10. An apparatus according to claim 9 wherein the data set has a red plane, a green plane and a blue plane and the extraction means derives the initial luminance channel from the planes.
11. An apparatus according to claim 8 wherein the data set includes the initial luminance channel as a separate channel and the extraction means derives the initial luminance channel.
CA2384485A 1999-09-16 2000-09-08 Method and apparatus for sharpening an image Expired - Fee Related CA2384485C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AUPQ2890A AUPQ289099A0 (en) 1999-09-16 1999-09-16 Method and apparatus for manipulating a bayer image
AUPQ2890 1999-09-16
PCT/AU2000/001074 WO2001020548A1 (en) 1999-09-16 2000-09-08 Method and apparatus for sharpening an image

Publications (2)

Publication Number Publication Date
CA2384485A1 true CA2384485A1 (en) 2001-03-22
CA2384485C CA2384485C (en) 2010-02-09

Family

ID=3817055

Family Applications (4)

Application Number Title Priority Date Filing Date
CA2384479A Expired - Fee Related CA2384479C (en) 1999-09-16 2000-09-08 Method and apparatus for up-interpolating a bayer image
CA2384541A Expired - Fee Related CA2384541C (en) 1999-09-16 2000-09-08 Method and apparatus for producing print from a bayer image
CA2384543A Expired - Fee Related CA2384543C (en) 1999-09-16 2000-09-08 Method and apparatus for rotating bayer images
CA2384485A Expired - Fee Related CA2384485C (en) 1999-09-16 2000-09-08 Method and apparatus for sharpening an image

Family Applications Before (3)

Application Number Title Priority Date Filing Date
CA2384479A Expired - Fee Related CA2384479C (en) 1999-09-16 2000-09-08 Method and apparatus for up-interpolating a bayer image
CA2384541A Expired - Fee Related CA2384541C (en) 1999-09-16 2000-09-08 Method and apparatus for producing print from a bayer image
CA2384543A Expired - Fee Related CA2384543C (en) 1999-09-16 2000-09-08 Method and apparatus for rotating bayer images

Country Status (15)

Country Link
US (18) US6804030B1 (en)
EP (4) EP1266357B1 (en)
JP (4) JP4339543B2 (en)
KR (1) KR100832181B1 (en)
CN (2) CN100361156C (en)
AT (4) ATE355571T1 (en)
AU (1) AUPQ289099A0 (en)
CA (4) CA2384479C (en)
DE (3) DE60043941D1 (en)
ES (1) ES2282136T3 (en)
HK (3) HK1048003A1 (en)
MX (1) MXPA02002881A (en)
SG (4) SG147279A1 (en)
WO (4) WO2001020548A1 (en)
ZA (1) ZA200202872B (en)

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