Patent EP0705025B1 successfully refreshed from Google Patents.
EP0705025B1
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Method and apparatus for reducing quantization artifacts in a hierarchical image storage and retrieval system
Assignee: Eastman Kodak Co
•
Filing: 1995-09-25
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Granted: 2000-03-29
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Expires: 2015-09-25
Abstract
No abstract record available.
Inventors
- 👤 Majid c/o Eastman Kodak Company Rabbani
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 12:41
CPC Classifications
G; G06; G06T; G06T1/00; G06T1/0021; G06T1/0028; H; H04; H04N; H04N1/00; H04N1/32; H04N1/32101; H04N1/32144; H04N1/32149; H04N1/32203; H04N1/32251; H04N1/32267; H04N1/40; H04N1/40068; H04N21/00; H04N21/20; H04N21/23; H04N21/238; H04N21/2389; H04N21/23892; H04N21/80; H04N21/83; H04N21/835; H04N21/8358; H04N2201/00; H04N2201/32; H04N2201/3201; H04N2201/3225; H04N2201/3233; H04N2201/3273; H04N2201/3274; H04N2201/328
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
150 words
A method for reducing quantization
artifacts in a hierarchical image system of the type
that decomposes (101) a high resolution image into low
resolution image components, including low resolution
image pixel values, and residual image pixel values
characterized in that the method further includes the
steps of: a) determining (50) the difference values
between the pixel values in the low resolution image
and the corresponding pixel values in the higher
resolution image; b) comparing (60) each of the difference
values against quantizer conversion values to
determine if an error would exist for an executed
conversion; c) adjusting (58) the image pixel values
within the low resolution image component if an error
would exist, to a value that eliminates the error to
form an adjusted low resolution image; and d) using the unadjusted image pixel values as
part of the adjusted low resolution image component if
an error does not exist.
Claim 2
Dependent Claim
142 words
A method according to Claim 1 further
comprising : e) forming a predicted higher resolution image
by interpolating (49) the pixel values of the adjusted
low resolution image components of steps c) and d); f) determining (50) the difference values
between the interpolated pixel values in the predicted
higher resolution image and the corresponding pixel
values in the higher resolution image; g) comparing (60) each of the difference
values against quantizer conversion values to
determine if an error would exist for an executed
conversion; h) adjusting (58) further the image pixel
values within the adjusted low resolution image
component if an error would exist, to a value that
eliminates the error to form an adjusted low
resolution image; and i) using (56) the unadjusted image pixel value
as part of the adjusted low resolution image component
if an error does not exist.
Claim 3
Dependent Claim
41 words
A method for according to Claim 2, wherein
a step (22) of applying watermark pixel values to
pixel positions within the low resolution image is
performed before step a) and said modified low
resolution image is used as low resolution image.
Claim 4
Dependent Claim
49 words
A method according to Claim 3, wherein the
predicted higher resolution image of step e) is formed
by sequentially interpolating (49) the pixel values of
a first block of low resolution image pixel values and
steps f) through i) are repeated for each pixel in the
higher resolution image.
Claim 5
Dependent Claim
151 words
Apparatus for reducing quantization
artifacts in a hierarchical image system of the type
including means (101) that decomposes a high
resolution image into low resolution components,
including low resolution image pixel values, and
residual image pixel values, characterized in that the
apparatus further includes: means (50) for determining the difference
values between the pixel values in the low resolution
image and the corresponding pixel values in the higher
resolution image; means (60) for comparing each of the
difference values against quantizer conversion values
to determine if an error would exist for an executed
conversion; and means (58) for adjusting the image pixel
values within the low resolution image component if an
error would exist, to a value that eliminates the
error to form an adjusted low resolution image
component and using (56) the image pixel value as part
of the adjusted low resolution image component if an
error does not exist.
Claim 6
Dependent Claim
142 words
Apparatus according to Claim 5 further
comprising : means (49) for forming a predicted higher
resolution image by interpolating the pixel values of
the adjusted low resolution image component; means (50) for determining the difference
values between the interpolated pixel values in the
predicted higher resolution image and the
corresponding pixel values in the higher resolution
image; means (60) for comparing each of the
difference values against quantizer conversion values
to determine if an error would exist for an executed
conversion; means (58) for adjusting the image pixel
values within the adjusted low resolution image
component if an error would exist, to a value that
eliminates the error to form a twice adjusted low
resolution image component; and means (56) for using the image pixel value as
part of the twice adjusted low resolution image
component if an error does not exist.
Claim 7
Dependent Claim
27 words
Apparatus according to Claim 6, further
comprising: means for applying pixel values to pixel
positions within the low resolution image to form a
low resolution image component.
Claim 8
Dependent Claim
26 words
A storage device (10) having stored
thereon the adjusted low resolution image components
and the residual image pixel values of any of Claims 5
to 7.
References Cited (Backward Citations)
No citation records indexed.
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