GB2264205A - Characterization of textures in a digitized image - Google Patents

Characterization of textures in a digitized image Download PDF

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Publication number
GB2264205A
GB2264205A GB8806905A GB8806905A GB2264205A GB 2264205 A GB2264205 A GB 2264205A GB 8806905 A GB8806905 A GB 8806905A GB 8806905 A GB8806905 A GB 8806905A GB 2264205 A GB2264205 A GB 2264205A
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Prior art keywords
image
orientation
clme
luminance
concerned
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Granted
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GB8806905A
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GB8806905D0 (en
GB2264205B (en
Inventor
Bruno Bardoux
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Thales SA
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Thomson CSF SA
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Publication of GB2264205B publication Critical patent/GB2264205B/en
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    • 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 using local operators
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/10—Segmentation; Edge detection
    • G06T7/11—Region-based segmentation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/40—Analysis of texture
    • G06T7/41—Analysis of texture based on statistical description of texture

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Probability & Statistics with Applications (AREA)
  • Image Analysis (AREA)
  • Measuring Or Testing Involving Enzymes Or Micro-Organisms (AREA)

Description

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According to the invention, a process for the char- acterization of textures in a digitized image, this image being analyzed element by element and each image element being represented by the digital value of its luminance, is characterized in that it consists, for each image element, in:
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- determining the modulus and orientation of the gradient of the luminance of the element concerned; - determining, from among the image elements neigh- bouring the element concerned, that for which the absolute value of the difference between the orientation of the luminance gradient of the element concerned, modulo 900, and the orientation of the luminance gradient of the neighbouring element, modulo 90 , is a maximum, this maximum value being caLLed the order of the Luminance gradient of the image element concerned; - determining a first characterization parameter of the texture of the image element concerned by computing the quadratic mean of the modulus of the Luminance gradient, in a window centered on the element concerned; - determining a second characterization parameter of the texture of the image element concerned, by computing the quadratic mean of the order, in a window centered on the element concerned.
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The invention will be better understood and other details will appear with the help of the following description given merely by way of example, ith reference to the accompanying figures in hich:
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- Figures la,lb,...,6a,6b show a step in a preferred form of the process according to the invention, for determining the modulus and orientation of the gradient of O "O '- (31 4J E O r0 0) -- "13 4-J u,.. [.- m 0).O ', I r" O {0 E ::3 4.1.r.- OJ 01J f,- 0J E.-n 4J e.- 0) ",-" u) E Cl r- CI "(3 4J 4- "10 E nO O EE CI I= 0J (O IO I-" t- r" "0 4 x r-".,- C E >.
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.DTD:
C m C:.O "! E -- U,- "I N ( I e- -r- "l + O.r- "-.,- r Z t.
O -I ( u _., r- " O - 0) -r" 4-' -r" 1 A U U 0 "-" U 0..i-m "-- "" U E "'",-._a m O m O t.. O "1 " " E 3= 4- O r" 4- X.A::: t- tl.,-.r- H "! U -- U ",- r O O U::;3 f-. 'C 4-'.,-:3 4-' - D" r- 4-.,- (]._ 4-' (3; 4-a - r- c. Q) L.,- O e- e- (D N "'- E 4." r > "'- ' "'- (= 0 O r- 4J O CL ",- I=.," A r-:3 "'- "" "'- 4-' 0 0 m - F'- X 0 L. U n m r",-óC (/) m (].m 0 ",- t.. 3= 0 ",- "0 'I.- r- _, O O '$-- 4-, E 13. O '- r0 m; O m --J: -. O "I I', QJ H m. 13 O L u.,-..a Q) Q r- O Q; O > "'- "" i e- m O -i Q Z::3 C p tl.,-; r- I L tO t'- C:: -,-- c" Q; Qj r X t- " I= 0 -- (D -I..c: r- m= O O..C: c- O t_ O N- "" (D (1., 01.,- '±,-",,., r- N-- -.IC: r,-..,- (, H O "" -41.-/ > U J.r-- U O L "- "-D H (3L (-- 4J O T-" "l - U v U u' O u O u O U O C t.
" 0 r" t-- n 0 "0 t....,..- on "..I..= -( "-1 m m L m G E m YJ JD t... " r- m.i.J m C n u 0 C C "r'= 0.r- C 4J r- OJ u C "- /) 0 ...r- 4J r- u n 4J m r- t. - 0 r- u f,- m 0 of- -.
.DTD:
e r" O.
C (n U3 0 t/) 4- q.) q]j r" 4-J u ( (]J x E r- Q; 4J (D (1 ".r.- 0 C.," I-- nO L. ( -r- - 0 N- - - 0 0 .CLME:

Claims (1)

  1. CLAIMS .CLME:
    I. Process for the characterization of textures in a digitized image, this image being analyzed element by element and each image element being represented by the digital value of its luminance, characterized in that it comprises, for each image element, in:
    .CLME:
    - determining the modulus and orientation of the gradient of the luminance of the element concerned; - determining, from among the image elements neigh- bouring the element concerned, that for which the absolute value of the difference between the orientation of the luminance gradient of the element concerned, modulo 90 , and the orientation of the luminance gradient of the neighbouring element, modulo 90 , is a maximum, this maximum value being called the order of the luminance gradient of the image element concerned; determining a first characterization parameter of the texture of the image element concerned by computing the quadratic mean of the modulus of the luminance gradient, in a window centered on the element concerned; and - determining a second characterization parameter of the texture of the image element concerned, by computing the quadratic mean of the order, in a window centered on the element concerned.
    .CLME:
    2. Process according to Claim 1, characterized in that in order to determine the modulus and orientation of the gradient of the luminance of each image element it comprises:
    .CLME:
    computing s convolution products LGi for i = 1 to s corresponding to s predetermined values Ri of orientation, where L is a two-dimensional matrix formed by values of luminance of a block of image elements surrounding the element concerned, and where Gi is a twomdimensional matrix such that the absolute value of LGi is a maximum when the orientation of the luminance gradient in the block of image elements has the value Ri; - third means of computing for computing the absolute value, modulo 900, of the difference between the orientation of the luminance gradient in each current element and the orientation of the luminance gradient in elements neighbouring the current element; and - fourth means of computing for determining, for each image element, a value of a second characterization parameter of its texture, equal to the quadratic mean of the orders of image elements located in a window centered on the element concerned; and for supplying this parameter value to an output terminal 5. Use of the device according to Claim 4, in a device for the segmentation of an image into regions of uniform texture.
    .CLME:
    6. Process or the characterization of textures in a digitized izage substantially as hereinbefore described.
    .CLME:
    7. Device for the characterization of textures in a digitized image substantially as hereinbefore described with reference to Figures 7 to 14 ol the accompanying draftings Amendments to the claims have been filed as follows I. Process for the characterization of textures in a digitized image, this image being analyzed element by element and each image element being represented by the digital value of its luminance, characterized in that it comprises, for each image element, in:
    .CLME:
    - determining the modulus and orientation of the gradient of the luminance of the element concerned; - determining, from among the image elements neigh- bouring the element concerned, that for which the absolute value of the difference between the orientation of the lumina.nce gradient of the element concerned, modulo 90c, and the orientation of the luminance gradient of the neighbouring element, modulo 90 , is a maximum, this -maximum value being called the order of the luminance gradient of the image element concerned; - determining a first characterization parameter of the texture of the image element concerned by computing the root mean square of the modulus of the luminance gradient, in a window comprising an array of elements centered on the element concerned; and - determining a second characterization parameter of the texture of Zhe image element concerned, by computing an the root mean square of the order, in a indow eomprisin array of elements centered on the element concerned.
    .CLME:
    2. Process according to Claim i, characterized in that in order to determine the modulus and orientation of the gradient of the luminance of each image element it comprises:
    .CLME:
    - computing s convolution products LGi for i = i to s corresponding to s predetermined values Ri of orientation, where L is a two-dimensional matrix formed by values of luminance of a block of image elements surrounding the element concerned, and where Gi is a two- dimensional matrix such that the absolute value of LGi is a maximum when the orientation of the luminance gradient in the block of image elements has the value Ri; 0 r.-- r- 4J 4J 4- r- O C C 4-=.t- r=" C 113 "0 r-. l.- {I; r::: O I..
    .CLME:
    r_ 0 4. u l.fl 0 C rg to C I., 4- 0 r::
    .CLME:
    -J O L O 4--, CI E X O. "," QJ.I-, O ' - -, O L E.O 4-- O "7 C - C r- O r-" 4J E.
    0 r" "7 > " L r- - "" U t O 0 4-- r.d L -r" '4-" 0 fl --a I r- -I t._ {n 4- L {_ O 4- r-, r- 4- C 4- J.C.O CJ > I -.,- L -- -J -O L O C "0 C. C O ( O.,-.
    .CLME:
    >....', I -,'-" (D 0 {- 4- I= -0 N E 4- t- 4-0 -" C O "-1,-'4-- 4J t- r- O - "O 4- E O 4J >', C E "O I 113 H L 0 O u) 4-- C E C O 4 co - C C - m " N (./) ( (I; t-" 4J C ",- @ E - " -] m '-I E E --.-a 4- -,- L "1. r- L r" -' 0,...I-.,.--, L u 4 4-C r0 O O-,. O E.0 " J)L O.,,.- 4 4-- O.r-'j L.
    C C -r- J E C.- L. O 1, u'('rm 0 C 4-.
    .CLME:
    E '7 " -0 ",- C O -- C > U C "-.- "- O I 4J "-., -, I_ x "" r- n L Cn I 0 r- 4J.Is 0 f- r:= j E E u 0 -J 13 -- O m C C L O C 4-- U.r-.
    O O ul O E r- - C a. -O a.a II 4- 0 n 0 n3., Q., 4-- J L C 0 4- u 0.) -I L 0.r-- 0 L. OJ.--.r" 'C r- "1:3 r",,- r I::: 0: rl L "3' I. 4J u r- {.. 0, > I: C E O J L C r-.J "7 E E '7 - O 4-- 4- "- ''" " 0 J.r- '7. -1,'I.:3 n r" I=: U El. U "E 4J L. (1; -r- 0 (3"} C U C E U L, "{3 I= U L.) E:.tJ.,- C O 4--.r- U Q JE:: L. --- "" U "P:3 f0 4-- O tO.,- O O 0 r-" _. O:3 L.
    4J 0 LO ':3 "0 4J 0 u L. -O -- --J > 0 E 4-" E u (1) {3. - u 0 0 0 U7 0 L 0 I. 0 "-- N N l - third means of computing for computing the absolute value, modulo 90 , of the difference between the orientation of the Luminance gradient in each current element and the orientation of the luminance gradient in elements neighbouring the current element; and fourth means of computing for determining, for each image element, a value of a second characterization parameter of its texture, equal to the root mean square of the orders of image elements located in a window comprising an array of elements centered on the element output terminal concerned; and for supplying this parameter value to an/ 5. Use of the device according to Claim 4, in a device for the segmentation of an image into regions of uniform texture.
    .CLME:
    6. Process for the characterization of textures in a digitized image substantially as hereinbefore described.
    .CLME:
    7. Device for the characterization of textures in a digitized image substantially as hereinbefore described with reference to Figures 7 to i4 of the accompanying draóings.
    .CLME:
GB8806905A 1987-03-27 1988-03-23 Process for the characterization of textures in a digitized image,and device for the implementation of this process Expired - Fee Related GB2264205B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR878704269A FR2687882B1 (en) 1987-03-27 1987-03-27 METHOD FOR CHARACTERIZING TEXTURES IN A DIGITALIZED IMAGE, AND DEVICE FOR CARRYING OUT SAID METHOD.

Publications (3)

Publication Number Publication Date
GB8806905D0 GB8806905D0 (en) 1993-05-26
GB2264205A true GB2264205A (en) 1993-08-18
GB2264205B GB2264205B (en) 1993-12-22

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FR (1) FR2687882B1 (en)
GB (1) GB2264205B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0663758A2 (en) * 1994-01-14 1995-07-19 Mita Industrial Co. Ltd. Image processing method and apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4553260A (en) * 1983-03-18 1985-11-12 Honeywell Inc. Means and method of processing optical image edge data

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0663758A2 (en) * 1994-01-14 1995-07-19 Mita Industrial Co. Ltd. Image processing method and apparatus
EP0663758A3 (en) * 1994-01-14 1996-07-31 Mita Industrial Co Ltd Image processing method and apparatus.

Also Published As

Publication number Publication date
FR2687882B1 (en) 1994-06-10
FR2687882A1 (en) 1993-08-27
GB8806905D0 (en) 1993-05-26
DE3810118A1 (en) 1993-10-28
GB2264205B (en) 1993-12-22

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