Patent EP1420362A2 successfully refreshed from Google Patents.
EP1420362A2
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EP
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Thumbnail image zooming using predetermined image sizes
Assignee: Canon Inc
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Filing: 1998-01-07
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Granted: —
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Expires: 2018-01-07
Abstract
Abstract Disclosed are method and apparatus for the manipulation of thumbnail images as used in image-based browsing file management systems. Disclosed are arrangements whereby zooming in and out of thumbnail images can be performed without a continued need to decompress a true image thus providing for faster operation. Pixel interpolation and/or replication are used to generate intermediate images that are display to deliver to the user a perception of a transitory zoom yet are of sufficient detail to maintain user orientation. Aspect ratio zooming of thumbnail containment areas is also disclosed which facilitates ease of browsing. The compression of thumbnail type images using a discrete wavelet transform facilitates the fast zoom of thumbnails and their associated containment areas.
Inventors
- 👤 Jeremy David Michael Thorp
- 👤 Paul Quentin Scott
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 12:37
CPC Classifications
G; G06; G06T; G06T9/00; G06F; G06F16/00; G06F16/50; G06F16/54; G06T3/00; G06T3/40; G06T3/4084; H; H04; H04N; H04N19/00; H04N19/60; H04N19/63
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
59 words
A method of zooming an image on a display device, said method comprising
the steps of: displaying a first image at a first predetermined size; stretching or shrinking the first image to one or more predetermined image
sizes; displaying at least one of said stretched or shrunken images; and displaying a second image at a second predetermined image size.
Claim 2
Independent Claim
59 words
A method of zooming an image on a display device, said method comprising
the steps of: displaying a first image at a first predetermined size; stretching or shrinking the first image to one or more predetermined image
sizes; displaying at least one of said stretched or shrunken images; and displaying a second image at a second predetermined image size.
Claim 3
Dependent Claim
36 words
A method according to claim 1, wherein said first image is stored on a
memory storage means in an encoded format and the steps of displaying further
includes a decoding of the first image for display.
Claim 4
Dependent Claim
36 words
A method according to claim 1, wherein said second image is stored on a
memory storage means in an encoded format and the steps of displaying further
includes a decoding of the second image for display.
Claim 5
Dependent Claim
17 words
A method according to claim 2 or 3, wherein the encoded format is a
compressed image format.
Claim 6
Dependent Claim
16 words
A method according to claim 4, wherein the compressed image format is a
wavelet coding technique.
Claim 7
Dependent Claim
18 words
A method according to claim 5, wherein said wavelet coding technique
comprises the SWEET method (as herein defined).
Claim 8
Dependent Claim
20 words
A method according to claim 4 or 5, wherein the compressed image format is
achieved by a JPEG coding technique.
Claim 9
Dependent Claim
19 words
A method according to claim 1, wherein the first and second image are
different resolutions of a single image.
Claim 10
Dependent Claim
31 words
A method according to claim 7, wherein said single image is stored as a single
compressed image and wherein the first and second images are extracted from the
single compressed image.
Claim 11
Dependent Claim
26 words
A method according to claim 1, wherein said stretching or shrinking comprises
adjusting the size of the first image by manipulating pixels of the first image.
Claim 12
Dependent Claim
32 words
A method according to claim 10, wherein said stretching comprising
mathematically manipulating values of groups of pixels to provide at least one pixel
value, and replicating said at least one pixel value.
Claim 13
Dependent Claim
40 words
A method according to claim 10, wherein said shrinking comprises
mathematically manipulating groups of pixels to provide at least one pixel value, and
assigning said one pixel value to a limited number of pixels smaller that contained in
said groups.
Claim 14
Dependent Claim
15 words
A method according to claim 12 wherein, said assigning comprises discarding
pixels from said image.
Claim 15
Dependent Claim
175 words
A method according to claim 3, wherein said image is coded into said encoded
format by a method of representing a digital image to provide a coded representation,
said method comprising the steps of: transforming said digital image to derive a plurality of coefficients, each
coefficient represented by a predefined bit sequence; selecting a portion of said plurality of coefficients as a region; (a) scanning the significance of each bitplane of said selected region from
a most significant bitplane towards a least significant bitplane and providing a first
token in said coded representation for each insignificant bitplane until a significant
bitplane is determined, wherein a second token is provided in said coded representation
for said significant bitplane; (b) partitioning said selected region into two or more subregions having a
predetermined form, and setting each of said subregions as said selected region; (c) repeating steps (a) and (b) commencing from said significant bitplane
until said selected region has a predetermined size, wherein said coefficients of said
selected region are coded and provided in said coded representation.
Claim 16
Dependent Claim
20 words
A method according to claim 14, wherein said transforming step comprises
applying a discrete wavelet transform to said digital image.
Claim 17
Dependent Claim
15 words
A method according to claim 14, wherein said region comprises said entire
plurality of coefficients.
Claim 18
Dependent Claim
17 words
A method according to claim 15, wherein said portion comprises a subband of
said plurality of coefficients.
Claim 19
Dependent Claim
20 words
A method according to claim 14, wherein said first and second tokens
comprise bit values of 0 and 1, respectively.
Claim 20
Dependent Claim
12 words
A method according to claim 14, wherein said subregions are equally sized.
Claim 21
Dependent Claim
11 words
A method according to claim 19, wherein said subregions are square.
Claim 22
Dependent Claim
19 words
A method according to claim 14, wherein said predetermined size of said
subregion is a 1 x 1 coefficient.
Claim 23
Dependent Claim
28 words
A method according to claim 21, wherein said 1 x 1 coefficient is encoded by
outputting bits of said corresponding bit sequence beginning with the respective
significant bitplane.
Claim 24
Dependent Claim
26 words
A method according to claim 22, wherein only bits of said corresponding bit
sequence above a predetermined minimum bit level are output in said coded
representation.
Claim 25
Dependent Claim
27 words
A method according to claim 14, wherein, in step (c), steps (a) and (b) are
repeated otherwise until each bitplane of said selected region has been scanned.
Claim 26
Dependent Claim
21 words
A method according to claim 24, wherein each bitplane of said selected region
above a minimum bit level has been scanned.
Claim 27
Independent Claim
116 words
A method of zooming an image on a display device, said method comprising
the steps of: (a) decompressing a compressed true image to a first representation of
said image at a predetermined size, and displaying said first
representation; (b) if the predetermined size is smaller than a desired image size then (i) stretching the representation to a larger image size and displaying
said stretched representation; and (ii) repeating step (b)(i) until said desired image size is reached; (c) if the predetermined size is larger than a desired image size then (i) shrinking the representation to a smaller image size and
displaying said shrunk representation; and (ii) repeating step (c)(i) until said desired image size is reached.
Claim 28
Independent Claim
116 words
A method of zooming an image on a display device, said method comprising
the steps of: (a) decompressing a compressed true image to a first representation of
said image at a predetermined size, and displaying said first
representation; (b) if the predetermined size is smaller than a desired image size then (i) stretching the representation to a larger image size and displaying
said stretched representation; and (ii) repeating step (b)(i) until said desired image size is reached; (c) if the predetermined size is larger than a desired image size then (i) shrinking the representation to a smaller image size and
displaying said shrunk representation; and (ii) repeating step (c)(i) until said desired image size is reached.
Claim 29
Dependent Claim
34 words
A method according to claim 26 comprising the further step, after step (c), of: (d) decompressing the compressed true image to a further representation
at a said desired size and displaying said further representation.
Claim 30
Dependent Claim
18 words
A method according to claim 26, wherein step (d) occurs substantially
simultaneously during steps (a) (b) and (c).
Claim 31
Dependent Claim
72 words
Apparatus for zooming an image for display on a display device, said
apparatus comprising: means for displaying a first representation of said image at a first
predetermined size means for stretching or shrinking said first representation to at least one further
predetermined size; means for displaying said stretched or shrunken representation at each said
further predetermined size, and means for displaying a second representation of said image at a second
predetermined size.
Claim 32
Dependent Claim
72 words
Apparatus for zooming an image for display on a display device, said
apparatus comprising: means for displaying a first representation of said image at a first
predetermined size means for stretching or shrinking said first representation to at least one further
predetermined size; means for displaying said stretched or shrunken representation at each said
further predetermined size, and means for displaying a second representation of said image at a second
predetermined size.
Claim 33
Dependent Claim
20 words
Apparatus according to claim 28, wherein means for displaying said second
representation operates substantially simultaneously with the other said means.
Claim 34
Dependent Claim
87 words
A computer program product comprising a computer readable medium having
a computer program recorded thereon for zooming images for display on a display
device, said computer program product comprising: means for displaying a first representation of said image at a first
predetermined size means for stretching or shrinking said first representation to at least one further
predetermined size; means for displaying said stretched or shrunken representation at each said
further predetermined size, and means for displaying a second representation of said image at a second
predetermined size.
Claim 35
Dependent Claim
87 words
A computer program product comprising a computer readable medium having
a computer program recorded thereon for zooming images for display on a display
device, said computer program product comprising: means for displaying a first representation of said image at a first
predetermined size means for stretching or shrinking said first representation to at least one further
predetermined size; means for displaying said stretched or shrunken representation at each said
further predetermined size, and means for displaying a second representation of said image at a second
predetermined size.
References Cited (Backward Citations)
No citation records indexed.
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