US5384904A
Expired / Lapsed
US
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Image scaling using real scale factors
Assignee: Intel Corp
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Filing: 1992-12-08
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Granted: 1995-01-24
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Expires: 2012-12-08
Abstract
Abstract A method for performing scaling of a video image uses a noninteger scale factor. The scaling using a series of images scaled according to integer powers of two. An integer scale factor is applied to the image to be scaled in order to provide a series of scaled images. A determination is made which scaled image is the closest image to the one corresponding to the fractional scale factor. The scaled image selected in this manner is then operated upon using an interpolation to obtain the value corresponding to the fractional scale factor. Alternatively, the two scaled images which are closest to the image corresponding to the fractional scale factor may be selected and an interpolation operation or an averaging operation of the two scaled images may be performed to obtain the factional scale image. The scaled images may be predetermined during off-line operations so that a plurality of image selections may be performed upon the same set of predetermined scaled images.
Inventors
- 👤 David L. Sprague
- 👤 Michael Keith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:33
CPC Classifications
G; G06; G06T; G06T3/00; G06T3/40; G06T3/4007
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
79 words
A method for scaling an input image, comprising the steps of: (a) selecting a scale factor X, wherein 2 n <X<2 n+1 and n is an integer; (b) selecting a scale factor Y, wherein Y is one of 2 n and 2 n+1 ; (c) scaling the input image according to the scale factor Y to generate a first scaled image; and (d) scaling the first scaled image according to the scale factor X to generate an output image.
Claim 2
Independent Claim
79 words
A method for scaling an input image, comprising the steps of: (a) selecting a scale factor X, wherein 2 n <X<2 n+1 and n is an integer; (b) selecting a scale factor Y, wherein Y is one of 2 n and 2 n+1 ; (c) scaling the input image according to the scale factor Y to generate a first scaled image; and (d) scaling the first scaled image according to the scale factor X to generate an output image.
Claim 3
Dependent Claim
11 words
The method of claim 1, wherein n is a negative integer.
Claim 4
Dependent Claim
11 words
The method of claim 1, wherein n is a positive integer.
Claim 5
Dependent Claim
13 words
The method of claim 1, wherein the input image is a video image.
Claim 6
Dependent Claim
24 words
The method of claim 1, wherein Y is the one of 2 n and 2 n+1 that is closest to the scale factor X.
Claim 7
Dependent Claim
29 words
The method of claim 1, wherein step (b) comprises the step of selecting a scale factor Y, wherein Y is the larger of 2 n and 2 n+1 .
Claim 8
Dependent Claim
11 words
The method of claim 1, wherein step (c) is performed off-line.
Claim 9
Dependent Claim
39 words
The method of claim 1, wherein step (c) comprises the step of successively scaling the input image by a factor of two until the input image is scaled by the scale factor Y to generate the first scaled image.
Claim 10
Dependent Claim
18 words
The method of claim 8, wherein the successive scaling of step (c) is performed using high order filtering.
Claim 11
Dependent Claim
35 words
The method of claim 9, wherein: the input image is a video image; n is a negative integer; Y is the larger of 2 n and 2 n+1 ; and step (c) is performed off-line.
Claim 12
Independent Claim
84 words
A system for scaling an input image, comprising: (a) means for selecting a scale factor X, wherein 2 n <X<2 n+1 and n is an integer; (b) means for selecting a scale factor Y, wherein Y is one of 2 n and 2 n+1 ; (c) means for scaling the input image according to the scale factor Y to generate a first scaled image; and (d) means for scaling the first scaled image according to the scale factor X to generate an output image.
Claim 13
Independent Claim
84 words
A system for scaling an input image, comprising: (a) means for selecting a scale factor X, wherein 2 n <X<2 n+1 and n is an integer; (b) means for selecting a scale factor Y, wherein Y is one of 2 n and 2 n+1 ; (c) means for scaling the input image according to the scale factor Y to generate a first scaled image; and (d) means for scaling the first scaled image according to the scale factor X to generate an output image.
Claim 14
Dependent Claim
11 words
The system of claim 11, wherein n is a negative integer.
Claim 15
Dependent Claim
11 words
The system of claim 11, wherein n is a positive integer.
Claim 16
Dependent Claim
13 words
The system of claim 11, wherein the input image is a video image.
Claim 17
Dependent Claim
24 words
The system of claim 11, wherein Y is the one of 2 n and 2 n+1 that is closest to the scale factor X.
Claim 18
Dependent Claim
17 words
The system of claim 11, wherein Y is the larger of 2 n and 2 n+1 .
Claim 19
Dependent Claim
38 words
The system of claim 11, wherein means (c) comprises means for successively scaling the input image by a factor of two until the input image is scaled by the scale factor Y to generate the first scaled image.
Claim 20
Dependent Claim
24 words
The system of claim 17, wherein means (c) further comprises high order filter means for scaling the input image by a factor of two.
Claim 21
Dependent Claim
30 words
The method of claim 18, wherein: Y is the larger of 2 n and 2 n+1 ; n is a negative integer; and the input image is a video image.
References Cited (Backward Citations)
US4716404A
Cited
US4847788A
Cited
US5276780A
Cited
US4872064A
Cited
US5184306A
Cited
US5253338A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-01-23 | 1998-07-25 | 1999-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-23 | 2002-07-25 | 2003-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-23 | 2006-07-25 | 2007-01-24 | $7700.00 | Window Closed / Lapsed |