US5172237A
Expired / Lapsed
US
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High quality color image compression system
Assignee: Ricoh Co Ltd
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Filing: 1991-12-19
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Granted: 1992-12-15
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Expires: 2011-12-19
Abstract
Abstract A color image compression system and method provides an improved technique of combining various image processing techniques to obtain high quality color image compression. The present invention provides color image compression, especially high quality original images that require up to 24 bits of data per pixel. The present invention utilizes a delta quantizing technique between an array of pixels to provide an improved color image compression aspect.
Inventors
- 👤 Steven M. Blonstein
- 👤 James D. Allen
- 👤 Kevin P. Corcoran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:32
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40056; G; G06; G06T; G06T9/00; G06T9/005; H04N1/46; H04N1/64; H04N1/646
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
189 words
A color image compression method comprising the steps of acquiring first color image data representative of a color image in a first format having a plurality of first color planes, converting the acquired color image data to a second format having a plurality of second color planes, spatially reducing the color image data in said second format to form spatially reduced data, and delta quantizing one or more color planes of said spatially reduced data to form compressed color image data representative of said color image, wherein said color image includes at least first and second scan lines of pixel data, and wherein each pixel is represented by a certain number of bits of data, and wherein a value of a certain pixel to be delta quantized is determined by calculating the difference between a first pixel and a second pixel which is most proximate to said certain pixel and the difference between said first pixel and a third pixel which is almost most proximate to said certain pixel, all pixels contained within said first and second scan lines, and assigning whichever value is greater to said certain pixel.
Claim 2
Dependent Claim
189 words
A color image compression method comprising the steps of acquiring first color image data representative of a color image in a first format having a plurality of first color planes, converting the acquired color image data to a second format having a plurality of second color planes, spatially reducing the color image data in said second format to form spatially reduced data, and delta quantizing one or more color planes of said spatially reduced data to form compressed color image data representative of said color image, wherein said color image includes at least first and second scan lines of pixel data, and wherein each pixel is represented by a certain number of bits of data, and wherein a value of a certain pixel to be delta quantized is determined by calculating the difference between a first pixel and a second pixel which is most proximate to said certain pixel and the difference between said first pixel and a third pixel which is almost most proximate to said certain pixel, all pixels contained within said first and second scan lines, and assigning whichever value is greater to said certain pixel.
Claim 3
Dependent Claim
15 words
A method as in claim 1 including the step of encoding said compressed image data.
Claim 4
Dependent Claim
16 words
A method as in claim 2 including the step of storing the encoded compressed image data.
Claim 5
Dependent Claim
16 words
The method as in claim 3 including the step of transmitting said encoded compressed image data.
Claim 6
Dependent Claim
143 words
A color image compression method comprising the steps of spatially reducing color image data having a plurality of color planes to form spatially reduced color image data, and delta quantizing said spatially reduced data to form a compressed color image, wherein said color image includes at least first and second scan lines of pixel data, and wherein each pixel is represented by a certain number of bits of data, and wherein a value of a certain pixel to be delta quantized is determined by calculating the difference between a first pixel and a second pixel which is most proximate to said certain pixel and the difference between said first pixel and a third pixel which is almost most proximate to said certain pixel, all pixels contained within said first and second scan lines, and assigning whichever value is greater to said certain pixel.
Claim 7
Dependent Claim
143 words
A color image compression method comprising the steps of spatially reducing color image data having a plurality of color planes to form spatially reduced color image data, and delta quantizing said spatially reduced data to form a compressed color image, wherein said color image includes at least first and second scan lines of pixel data, and wherein each pixel is represented by a certain number of bits of data, and wherein a value of a certain pixel to be delta quantized is determined by calculating the difference between a first pixel and a second pixel which is most proximate to said certain pixel and the difference between said first pixel and a third pixel which is almost most proximate to said certain pixel, all pixels contained within said first and second scan lines, and assigning whichever value is greater to said certain pixel.
Claim 8
Dependent Claim
28 words
A color image compression system as in claim 5 wherein the delta quantizing step includes the step of delta quantizing each color plane of said spatially reduced data.
Claim 9
Dependent Claim
193 words
A color image compression system comprising means for acquiring first color image data representative of a color image in the first format having a plurality of first color planes, means for converting the acquired color image to a second format having a plurality of second color planes, means for spatially reducing the color image data in said second format to form spatially reduced data, and means for delta quantizing one or more color planes of said spatially reduced data to form compressed color image data representative of said color image, wherein said color image includes at least first and second scan lines of pixel data, and wherein each pixel is represented by a certain number of bits of data, and wherein a value of a certain pixel to be delta quantized is determined by calculating the difference between a first pixel and a second pixel which is most proximate to said certain pixel and the difference between said first pixel and a third pixel which is almost most proximate to said certain pixel, all pixels contained within said first and second scan lines, and assigning whichever value is greater to said certain pixel.
Claim 10
Dependent Claim
193 words
A color image compression system comprising means for acquiring first color image data representative of a color image in the first format having a plurality of first color planes, means for converting the acquired color image to a second format having a plurality of second color planes, means for spatially reducing the color image data in said second format to form spatially reduced data, and means for delta quantizing one or more color planes of said spatially reduced data to form compressed color image data representative of said color image, wherein said color image includes at least first and second scan lines of pixel data, and wherein each pixel is represented by a certain number of bits of data, and wherein a value of a certain pixel to be delta quantized is determined by calculating the difference between a first pixel and a second pixel which is most proximate to said certain pixel and the difference between said first pixel and a third pixel which is almost most proximate to said certain pixel, all pixels contained within said first and second scan lines, and assigning whichever value is greater to said certain pixel.
Claim 11
Dependent Claim
14 words
A system as in claim 7 including means for encoding said compressed image data.
Claim 12
Dependent Claim
15 words
A system as in claim 8 including means for storing the encoded compressed image data.
Claim 13
Dependent Claim
15 words
A system as in claim 9 including means for transmitting said encoded compressed image data.
Claim 14
Dependent Claim
27 words
A color image compression system as in claim 10 wherein the delta quantizing means includes means for delta quantizing each color plane of said spatially reduced data.
Claim 15
Dependent Claim
15 words
The system as in claim 11 wherein said first format is a red-green-blue (RBG) format.
Claim 16
Dependent Claim
14 words
The system as in claim 12 wherein said second format is a YIQ format.
Claim 17
Dependent Claim
27 words
A system as in claim 13 wherein said means for delta quantizing includes a delta quantized table for storing delta quantized values for each of said planes.
Claim 18
Dependent Claim
27 words
A system as in claim 14 wherein said first pixel is a pixel within a scan line immediately above and to the left of said certain pixel.
Claim 19
Dependent Claim
16 words
A system as in claim 15 wherein said second pixel is immediately above said certain pixel.
Claim 20
Dependent Claim
25 words
A system as in claim 16 wherein said third pixel is within the same scan line and immediately to the left of said certain pixel.
Claim 21
Dependent Claim
13 words
A system as in claim 14 wherein said delta quantized table is linear.
Claim 22
Dependent Claim
13 words
A system as in claim 14 wherein said delta quantized table is non-linear.
Claim 23
Dependent Claim
13 words
A system as in claim 14 wherein said delta quantized table is asymmetric.
Claim 24
Dependent Claim
144 words
A color image compression system comprising means for spatially reducing color image data having a plurality of color planes to form spatially reduced color image data and means for delta quantizing said spatially reduced data to form a compressed color image wherein said color image includes at least first and second scan lines of pixel data, and wherein each pixel is represented by a certain number of bits of data, and wherein a value of a certain pixel to be delta quantized is determined by calculating the difference between a first pixel and a second pixel which is most proximate to said certain pixel and the difference betwee said first pixel and a third pixel which is also most proximate to said certain pixel, all pixels contained within said first and second scan lines, and assigning whichever value is greater to said certain pixel.
Claim 25
Dependent Claim
144 words
A color image compression system comprising means for spatially reducing color image data having a plurality of color planes to form spatially reduced color image data and means for delta quantizing said spatially reduced data to form a compressed color image wherein said color image includes at least first and second scan lines of pixel data, and wherein each pixel is represented by a certain number of bits of data, and wherein a value of a certain pixel to be delta quantized is determined by calculating the difference between a first pixel and a second pixel which is most proximate to said certain pixel and the difference betwee said first pixel and a third pixel which is also most proximate to said certain pixel, all pixels contained within said first and second scan lines, and assigning whichever value is greater to said certain pixel.
References Cited (Backward Citations)
US3825832A
Cited
US4661862A
Cited
US4725887A
Cited
US4758885A
Cited
US4716453A
Cited
US4965845A
Cited
US4729021A
Cited
US4941194A
Cited
US4783841A
Cited
US4743959A
Cited
US4975768A
Cited
US4797729A
Cited
US5057939A
Cited
US5049990A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-12-15 | 1996-06-15 | 1996-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-15 | 2000-06-15 | 2000-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-15 | 2004-06-15 | 2004-12-15 | $7700.00 | Window Closed / Lapsed |