Patent EP0740269A2 successfully refreshed from Google Patents.
EP0740269A2
Expired / Lapsed
EP
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Scaling compressed images
Assignee: HP Inc
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Filing: 1996-04-19
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Granted: —
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Expires: 2016-04-19
Abstract
Abstract An efficient method and apparatus that operates directly upon compressed blocks of image data to transform them into compressed blocks of scaled image data. Decompression of the compressed blocks of scaled image data yields blocks of scaled image data, which are then used to display a scaled down version of an original image. The present invention is more computationally efficient than a previously known scaling method, which required that compressed blocks of image data be uncompressed prior to any scaling operations.
Inventors
- 👤 Balas K. Natarajan
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 11:09
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/48; H04N19/90
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
A method comprising the steps of: providing blocks of data representative of an original image stored in a memory of a first computer; using the first computer to compress the blocks of image data; using the first computer to multiply each compressed block of image data by at least one transformation matrix so as to produce at least one compressed block of scaled image data.
Claim 2
Dependent Claim
90 words
A method as in claim 1 further comprising the steps of: transmitting said at least one compressed block of image data from the first computer to a second computer coupled with the first computer; using the second computer to decompress said at least one compressed block of scaled image data to produce at least one block of scaled image data; and using said at least one the block of scaled image data to display a scaled version of the original image on a display device coupled to the second computer.
Claim 3
Dependent Claim
61 words
A method as in claim 1 wherein the matrix multiply step includes using the first computer to multiply each compressed block of image data by at least one transformation matrix having terms of magnitude substantially equal to only either zero, one eighth, one fourth, or one half, so as to produce said at least one compressed block of scaled image data.
Claim 4
Independent Claim
141 words
A method comprising the steps of: providing blocks of data representative of an original image stored in a memory of a first computer; using the first computer to compress the blocks of image data; transmitting the compressed blocks of image data from the first computer to a second computer coupled with the first computer; using the second computer to multiply each compressed block of image data by at least one transformation matrix so as to produce at least one compressed block of scaled image data; using the second computer to decompress said at least one compressed block of scaled image data to produce at least one block of scaled image data; and using said at least one the block of scaled image data to display a scaled version of the original image on a display device coupled to the second computer.
Claim 5
Dependent Claim
61 words
A method as in claim 4 wherein the matrix multiply step includes using the first computer to multiply each compressed block of image data by at least one transformation matrix having terms of magnitude substantially equal to only either zero, one eighth, one fourth, or one half, so as to produce said at least one compressed block of scaled image data.
Claim 6
Independent Claim
65 words
An apparatus comprising: a computer having a memory for storing blocks of data representative of an original image; a data compressor for compressing blocks of image data to produce compressed data blocks; and means coupled with the data compressor for multiplying each compressed block of image data by at least one transformation matrix so to produce at least one compressed block of scaled image data.
Claim 7
Dependent Claim
57 words
An apparatus as in claim 6 further comprising: a data decompressor for decompressing said at least one compressed block of scaled image data to produce at least one block of scaled image data; and a display for using said at least one the block of scaled image data to display a scaled version of the original image.
Claim 8
Dependent Claim
59 words
An apparatus as in claim 6 wherein the matrix multiplying means includes a means for multiplying each compressed block of image data by at least one transformation matrix having terms of magnitude substantially equal to only either zero, one eighth, one fourth, or one half, so as to produce said at least one compressed block of scaled image data.
References Cited (Backward Citations)
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