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US5129015A
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Apparatus and method for compressing still images without multiplication
Assignee: Ricoh Co Ltd
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Filing: 1990-04-19
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Granted: 1992-07-07
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Expires: 2010-04-19
Abstract
Abstract Transforms such as the DCT are useful for image compression. One close relative of the DCT is preferred for its arithmetic simplicity. A method is described whereby the image compression is done with no multiplications. Other enhancements are made to improve image quality.
Inventors
- 👤 James D. Allen
- 👤 Steve M. Blonstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:49
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/76; G06F7/78; G06F17/00; G06F17/10; G06F17/14; G06F17/147; G11; G11C; G11C19/00; G11C8/00; G11C8/12; H; H04; H04N; H04N11/00; H04N11/04; H04N11/042; H04N11/044; H04N19/00; H04N19/10; H04N19/102; H04N19/124; H04N19/126; H04N19/60
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
107 words
An image compressor for compressing tricolor image pixel data comprising means for converting said tricolor information data to alternate luminance-chrominance space color data, a shift register for storing the alternate color space data, first frequency domain transform means including a first adder array for vertically transforming said alternate color space data using only adders, a shift array for providing a shift array for each color of said transformed color space data, second frequency domain transform means including a second adder array for horizontally transforming the data from said shift array using only adders, means for scaling the transformed data, and means for encoding the scaled transformed data.
Claim 2
Dependent Claim
107 words
An image compressor for compressing tricolor image pixel data comprising means for converting said tricolor information data to alternate luminance-chrominance space color data, a shift register for storing the alternate color space data, first frequency domain transform means including a first adder array for vertically transforming said alternate color space data using only adders, a shift array for providing a shift array for each color of said transformed color space data, second frequency domain transform means including a second adder array for horizontally transforming the data from said shift array using only adders, means for scaling the transformed data, and means for encoding the scaled transformed data.
Claim 3
Dependent Claim
63 words
An image compressor for compressing image pixel data comprising first frequency domain transform means including a first adder array for vertically transforming said image data using only adders, a shift array for providing a shift array for said transformed image data, and second frequency domain transform means including second adder array for horizontally transforming the data from said shift array using only adders.
Claim 4
Dependent Claim
63 words
An image compressor for compressing image pixel data comprising first frequency domain transform means including a first adder array for vertically transforming said image data using only adders, a shift array for providing a shift array for said transformed image data, and second frequency domain transform means including second adder array for horizontally transforming the data from said shift array using only adders.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-07-07 | 1996-01-06 | 1996-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-07 | 2000-01-06 | 2000-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-07 | 2004-01-06 | 2004-07-07 | $7700.00 | Window Closed / Lapsed |