DK1984892T3 - Forgrunds-/baggrundssegmentering i digitale billeder - Google Patents

Forgrunds-/baggrundssegmentering i digitale billeder Download PDF

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Publication number
DK1984892T3
DK1984892T3 DK06791605.6T DK06791605T DK1984892T3 DK 1984892 T3 DK1984892 T3 DK 1984892T3 DK 06791605 T DK06791605 T DK 06791605T DK 1984892 T3 DK1984892 T3 DK 1984892T3
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Denmark
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image
index
dct
images
block
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DK06791605.6T
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English (en)
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Peter Corcoran
Adrian Capata
Eran Steinberg
Petronel Bigioi
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Fotonation Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/10—Segmentation; Edge detection
    • G06T7/174—Segmentation; Edge detection involving the use of two or more images
    • 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
    • G06T7/10—Segmentation; Edge detection
    • G06T7/194—Segmentation; Edge detection involving foreground-background segmentation
    • 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
    • G06T2207/10141—Special mode during image acquisition
    • G06T2207/10148—Varying focus
    • 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
    • G06T2207/20—Special algorithmic details
    • G06T2207/20021—Dividing image into blocks, subimages or windows
    • 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
    • G06T2207/20—Special algorithmic details
    • G06T2207/20048—Transform domain processing
    • G06T2207/20052—Discrete cosine transform [DCT]
    • 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
    • G06T2207/20—Special algorithmic details
    • G06T2207/20212—Image combination
    • G06T2207/20224—Image subtraction

Claims (5)

1. Fremgangsmåde udført i et digitalkamera (20) til at skelne mellem forgrunds-og baggrundsregioner af et digitalbillede afen scene, hvilken fremgangsmåde omfatter at tage (trin 202 og 204) første og anden billeder (A, B) af nominelt den samme scene i hurtig rækkefølge under anvendelse af den samme billedtagningsindretning og lagre de tagne billeder, idet det første billede (A) tages med forgrunden mere i fokus end baggrunden og det andet billede (B) tages med baggrunden mere i fokus end forgrunden, og sammenligne (trin 206 til 214) de lagrede billeder for at bestemme en forgrundsregion/område af det første billede, kendetegnet ved at: de tagne billeder lagres i DCT-kodet format, de kodede billeder sammenlignes ved at sammenligne deres højfrekvenskomponenter, og høj-frekvenskomponenterne sammenlignes ved at: (a) beregne (trin 208) summen af valgte højere ordenskoefficienter for hver af en flerhed af DCT-blokke af det første billede (A), idet summen betegnes heri som HF-indekset af blokken, (b) beregne (trin 210) HF-indekset for hver af en flerhed af DCT-blokke af det andet billede (B), (c) sammenligne (trin 212) HF-indekset af hver DCT-blok af det første billede med HF-indekset af DCT-blokken af den ækvivalente region af det andet billede, (d) hvis HF-indekset af en given DCT-blok af det første billede er større end HF-indekset af DCT-blokken af den ækvivalente region af det andet billede, tildele den givne blok af det første billede som svarende til en forgrundsregion af billedet, og (e) hvis HF-indekset af en given DCT-blok af det første billede er mindre end HF-indekset af DCT-blokken af den ækvivalente region af det andet billede, tildele den givne blok af det første billede som svarende til en baggrundsregion af billedet, hvor det første billede (A) er et relativt højopløsningsbillede og det andet billede (B) er et relativt lavopløsnings- før- eller efter-betragtningsbillede, hvorved en DCT-blok i det andet billede svarer til et større område af scenen end en DCT-blok i det første billede, og hvor hvert HF-indeks af det første billede trækkes fra det HF-indeks af det andet billede hvis DCT-blok svarer til et område af scenen der i det væsentlige indeholder området af scenen svarende til DCT-blokken af det første billede, hvorved HF-indekser for flere tilgrænsende DCT-blokke i det første billede trækkes fra det samme HF-indeks af det andet billede svarende til en enkelt DCT-blok i det andet billede.
2. Fremgangsmåden ifølge krav 1, yderligere omfattende trinnet at bringe de første og anden billeder på linje mellem trin (a) og trin (b).
3. Fremgangsmåden ifølge krav 1 eller 2, yderligere omfattende at danne en digital afbildning fra resultatet af at tildele blokkene som svarerende til en baggrunds- eller forgrundsregion af billedet.
4. Fremgangsmåden ifølge et hvilket som helst af de foregående krav, hvor de valgte højereordenskoefficienter er de øverste 25% af koefficienter.
5. Digitalkamera (20) omfattende organ til at tage første og anden billeder (A, B) af nominelt den samme scene i hurtig rækkefølge under anvendelse af den samme billedtagningsindretning (60) og lagre de tagne billeder, det første billede (A) tages med forgrunden mere i fokus end baggrunden og det andet billede (B) tages med baggrunden mere i fokus end forgrunden, og behandlingsorgan (90) til at sammenligne de lagrede billeder for at bestemme en forgrundsregion af det første billede, kendetegnet ved at: de tagne billeder lagres i DCT-kodet format, de kodede billeder sammenlignes ved at sammenligne deres højfrekvenskomponenter, og høj-frekvenskomponenterne af de kodede signaler sammenlignes ved at: (a) beregne summen af valgte højereordenskoefficienter for hver af en flerhed af DCT-blokke af det første billede, idet summen betegnes heri som HF-indekset af blokken, (b) beregne HF-indekset for hver af en flerhed af DCT-blokke af det andet billede, (c) sammenligne HF-indekset af hver DCT-blok af det første billede med HF-indekset af DCT-blokken af den ækvivalente region af det andet billede, (d) hvis HF-indekset af en given DCT-blok af det første billede er større end HF-indekset af DCT-blokken af den ækvivalente region af det andet billede, tildele den givne blok af det første billede som svarende til en forgrundsregion af billedet, og (e) hvis HF-indekset af en given DCT-blok af det første billede er mindre end HF-indekset af DCT-blokken af den ækvivalente region af det andet billede, tildele den givne blok af det første billede som svarende til en baggrundsregion af billedet, hvor det første billede (A) er et relativt højopløsningsbillede og det andet billede (B) er et relativt lavopløsnings- før- eller efter-betragtningsbillede, hvorved en DCT-blok i det andet billede svarer til et større område af scenen end en DCT-blok i det første billede, og hvor hvert HF-indeks af det første billede trækkes fra det HF-indeks af det andet billede hvis DCT-blok svarer til et område af scenen der i det væsentlige indeholder området af scenen svarende til DCT-blokken af det første billede, hvorved HF-indekser for flere tilgrænsende DCT-blokke i det første billede trækkes det samme HF-indeks af det andet billede svarende til en enkelt DCT-blok i det andet billede.
DK06791605.6T 2006-02-14 2006-08-21 Forgrunds-/baggrundssegmentering i digitale billeder DK1984892T3 (da)

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US77371406P 2006-02-14 2006-02-14
PCT/EP2006/008229 WO2007093199A2 (en) 2006-02-14 2006-08-21 Foreground/background segmentation in digital images

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US (2) US7868922B2 (da)
EP (1) EP1984892B1 (da)
JP (1) JP5004972B2 (da)
CN (3) CN101416219B (da)
DK (1) DK1984892T3 (da)
IE (2) IES20060558A2 (da)
WO (1) WO2007093199A2 (da)

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