WO2002005206A3 - Distortion-free image contrast enhancement - Google Patents

Distortion-free image contrast enhancement Download PDF

Info

Publication number
WO2002005206A3
WO2002005206A3 PCT/CA2001/000982 CA0100982W WO0205206A3 WO 2002005206 A3 WO2002005206 A3 WO 2002005206A3 CA 0100982 W CA0100982 W CA 0100982W WO 0205206 A3 WO0205206 A3 WO 0205206A3
Authority
WO
WIPO (PCT)
Prior art keywords
fairway
local
range
image
dynamic range
Prior art date
Application number
PCT/CA2001/000982
Other languages
French (fr)
Other versions
WO2002005206A2 (en
Inventor
Brian G James
Original Assignee
Athentech Tech Inc
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 Athentech Tech Inc filed Critical Athentech Tech Inc
Priority to AU7225101A priority Critical patent/AU7225101A/en
Priority to NZ523251A priority patent/NZ523251A/en
Priority to AU2001272251A priority patent/AU2001272251B2/en
Priority to JP2002508738A priority patent/JP4175461B2/en
Priority to EP01951267A priority patent/EP1299858B1/en
Priority to MXPA02012756A priority patent/MXPA02012756A/en
Priority to KR1020037000239A priority patent/KR100572444B1/en
Priority to AT01951267T priority patent/ATE500569T1/en
Priority to DE60144150T priority patent/DE60144150D1/en
Publication of WO2002005206A2 publication Critical patent/WO2002005206A2/en
Publication of WO2002005206A3 publication Critical patent/WO2002005206A3/en

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T5/00—Image enhancement or restoration
    • G06T5/40—Image enhancement or restoration by the use of histogram techniques
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T5/00—Image enhancement or restoration
    • G06T5/94—
    • 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
    • G06T2207/10116—X-ray image
    • 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
    • G06T2207/30—Subject of image; Context of image processing
    • G06T2207/30004—Biomedical image processing

Abstract

An image, such as an X-ray, is enhanced through local enhancement of the contrast of the image's point intensities. A first, low frequency upper curve is fitted to the local maximums and a second independent, low frequency lower curve is fit to the local minimums, forming a fairway with the raw image data residing therebetween. A local range, between the fairway local maximum intensity and fairway local minimum intensity, is extracted for each point. Each point is scaled by the ratio between the fairway's local range and the dynamic range for the image so as to maximize its variation in intensity between it and its neighboring points. Preferably an iterative moving average technique is used to establish the fairway curves. In a preferred embodiment, outlier points scaled outside the fairway are temporarily stored at higher precision than the dynamic range. A histogram of the fairway corrected data is formed, having a range greater than the dynamic range and encompassing substantially all the outlier points. Only the most deviant of the outliers are trimmed in this histogram correction and the resulting range limits for the entire image are scaled to the dynamic range.
PCT/CA2001/000982 2000-07-07 2001-07-05 Distortion-free image contrast enhancement WO2002005206A2 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
AU7225101A AU7225101A (en) 2000-07-07 2001-07-05 Distortion-free image contrast enhancement
NZ523251A NZ523251A (en) 2000-07-07 2001-07-05 Distortion-free image contrast enhancement
AU2001272251A AU2001272251B2 (en) 2000-07-07 2001-07-05 Distortion-free image contrast enhancement
JP2002508738A JP4175461B2 (en) 2000-07-07 2001-07-05 Increase the contrast of undistorted images
EP01951267A EP1299858B1 (en) 2000-07-07 2001-07-05 Distortion-free image contrast enhancement
MXPA02012756A MXPA02012756A (en) 2000-07-07 2001-07-05 Distortion-free image contrast enhancement.
KR1020037000239A KR100572444B1 (en) 2000-07-07 2001-07-05 Distortion-free image contrast improvement
AT01951267T ATE500569T1 (en) 2000-07-07 2001-07-05 DISTORTION-FREE IMAGE CONTRAST ENHANCEMENT
DE60144150T DE60144150D1 (en) 2000-07-07 2001-07-05 DECORATION-FREE PICTURE CONTRAST GAIN

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/611,773 US6633684B1 (en) 2000-07-07 2000-07-07 Distortion-free image contrast enhancement
US09/611,773 2000-07-07

Publications (2)

Publication Number Publication Date
WO2002005206A2 WO2002005206A2 (en) 2002-01-17
WO2002005206A3 true WO2002005206A3 (en) 2002-12-19

Family

ID=24450368

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA2001/000982 WO2002005206A2 (en) 2000-07-07 2001-07-05 Distortion-free image contrast enhancement

Country Status (12)

Country Link
US (1) US6633684B1 (en)
EP (1) EP1299858B1 (en)
JP (1) JP4175461B2 (en)
KR (1) KR100572444B1 (en)
CN (1) CN1251147C (en)
AT (1) ATE500569T1 (en)
AU (2) AU2001272251B2 (en)
CA (1) CA2352678A1 (en)
DE (1) DE60144150D1 (en)
MX (1) MXPA02012756A (en)
NZ (1) NZ523251A (en)
WO (1) WO2002005206A2 (en)

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Also Published As

Publication number Publication date
JP2004503029A (en) 2004-01-29
CA2352678A1 (en) 2002-01-07
WO2002005206A2 (en) 2002-01-17
DE60144150D1 (en) 2011-04-14
MXPA02012756A (en) 2004-04-05
KR20030012934A (en) 2003-02-12
EP1299858B1 (en) 2011-03-02
NZ523251A (en) 2004-06-25
AU2001272251B2 (en) 2006-07-27
JP4175461B2 (en) 2008-11-05
ATE500569T1 (en) 2011-03-15
CN1440542A (en) 2003-09-03
CN1251147C (en) 2006-04-12
AU7225101A (en) 2002-01-21
US6633684B1 (en) 2003-10-14
EP1299858A2 (en) 2003-04-09
KR100572444B1 (en) 2006-04-18

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