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US5162898A
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US
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Color image data compressing apparatus and method
Assignee: Sharp Corp
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Filing: 1989-10-04
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Granted: 1992-11-10
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Expires: 2009-10-04
Abstract
Abstract A compressing apparatus for compressing color image data including R, G and B data. The apparatus includes a converter for converting the R, G and B data into luminance data and chrominance data, and an encoder. The encoder encodes the luminance data to compressed luminance data, through fine quantization at regions where human eyes are sensitive, and through coarse quantization at regions where human eyes are less sensitive, such as, e.g., in dark or bright areas. The encoder also encodes the chrominance data to compressed chrominance data in a similar manner.
Inventors
- 👤 Tomoko Aono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:01
CPC Classifications
H; H04; H04N; H04N11/00; H04N11/04; H04N11/042; H04N19/00; H04N19/10; H04N19/102; H04N19/124; H04N19/126; H04N19/169; H04N19/186; H04N9/00; H04N9/79; H04N9/80; H04N9/804; H04N9/8042; H04N9/8047; H04N19/60
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
123 words
A compressing apparatus for compressing color image data including R, G and B data, said apparatus comprising: a first converter for converting said R, G and B data into luminance data and chrominance data; first encoder means for encoding said luminance data to compressed luminance data, through fine quantization at regions where human eyes are sensitive, and through coarse quantization at regions where human eyes are less sensitive; and second encoder means for encoding said chrominance data to compressed chrominance data, through fine quantization at regions where human eyes are sensitive, and through coarse quantization at regions where human eyes are less sensitive; said first encoder means comprising a first memory for storing a table for changing luminance data to compressed luminance data.
Claim 2
Dependent Claim
123 words
A compressing apparatus for compressing color image data including R, G and B data, said apparatus comprising: a first converter for converting said R, G and B data into luminance data and chrominance data; first encoder means for encoding said luminance data to compressed luminance data, through fine quantization at regions where human eyes are sensitive, and through coarse quantization at regions where human eyes are less sensitive; and second encoder means for encoding said chrominance data to compressed chrominance data, through fine quantization at regions where human eyes are sensitive, and through coarse quantization at regions where human eyes are less sensitive; said first encoder means comprising a first memory for storing a table for changing luminance data to compressed luminance data.
Claim 3
Dependent Claim
123 words
A compressing apparatus for compressing color image data including R, G and B data, said apparatus comprising: a first converter for converting said R, G and B data into luminance data and chrominance data; first encoder means for encoding said luminance data to compressed luminance data, through fine quantization at regions where human eyes are sensitive, and through coarse quantization at regions where human eyes are less sensitive; and second encoder means for encoding said chrominance data to compressed chrominance data, through fine quantization at regions where human eyes are sensitive, and through coarse quantization at regions where human eyes are less sensitive; said second encoder means comprising a first memory for storing a table for changing chrominance data to compressed chrominance data.
Claim 4
Dependent Claim
123 words
A compressing apparatus for compressing color image data including R, G and B data, said apparatus comprising: a first converter for converting said R, G and B data into luminance data and chrominance data; first encoder means for encoding said luminance data to compressed luminance data, through fine quantization at regions where human eyes are sensitive, and through coarse quantization at regions where human eyes are less sensitive; and second encoder means for encoding said chrominance data to compressed chrominance data, through fine quantization at regions where human eyes are sensitive, and through coarse quantization at regions where human eyes are less sensitive; said second encoder means comprising a first memory for storing a table for changing chrominance data to compressed chrominance data.
Claim 5
Dependent Claim
24 words
An apparatus as claimed in claim 1, further comprising a recording/play means for recording and playing said compressed luminance data and compressed chrominance data.
Claim 6
Dependent Claim
72 words
An apparatus as claimed in claim 1, further comprising: recording/play means for recording and playing said compressed luminance data and compressed chrominance data; first decoder means for decoding said compressed luminance data back to said luminance data; and second decoder means for decoding said compressed chrominance data back to said chrominance data; said first decoder means comprising second memory means for storing a table for changing compressed luminance data to luminance data.
Claim 7
Dependent Claim
72 words
An apparatus as claimed in claim 2, further comprising: recording/play means for recording and playing said compressed luminance data and compressed chrominance data; first decoder means for decoding said compressed luminance data back to said luminance data; and second decoder means for decoding said compressed chrominance data back to said chrominance data; said second decoder means comprising second memory means for storing a table for changing compressed chrominance data to chrominance data.
Claim 8
Dependent Claim
155 words
A compressing apparatus for compressing color image data including R, G and B data, said apparatus comprising: a first converter for converting said R, G and B data into luminance data and chrominance data; first encoder means for encoding said luminance data to compressed luminance data, through fine quantization at regions where human eyes are sensitive, and through coarse quantization at regions where human eyes are less sensitive; and second encoder means for encoding said chrominance data to compressed chrominance data, through fine quantization at regions where human eyes are sensitive, and through coarse quantization at regions where human eyes are less sensitive, and also through reducing the chrominance data word lengths by shortening the chrominance data word lengths when the magnitude of the luminance, as indicated by the luminance data, is above a predetermined first threshold or below a predetermined second threshold, wherein said predetermined first threshold is greater than said predetermined second threshold.
Claim 9
Dependent Claim
155 words
A compressing apparatus for compressing color image data including R, G and B data, said apparatus comprising: a first converter for converting said R, G and B data into luminance data and chrominance data; first encoder means for encoding said luminance data to compressed luminance data, through fine quantization at regions where human eyes are sensitive, and through coarse quantization at regions where human eyes are less sensitive; and second encoder means for encoding said chrominance data to compressed chrominance data, through fine quantization at regions where human eyes are sensitive, and through coarse quantization at regions where human eyes are less sensitive, and also through reducing the chrominance data word lengths by shortening the chrominance data word lengths when the magnitude of the luminance, as indicated by the luminance data, is above a predetermined first threshold or below a predetermined second threshold, wherein said predetermined first threshold is greater than said predetermined second threshold.
Claim 10
Independent Claim
144 words
A method for compressing color image data including R, G and B data, said method comprising steps of: converting said R, G and B data into luminance data and chrominance data; encoding said luminance data to compressed luminance data, through fine quantization at regions where human eyes are sensitive, and through coarse quantization at regions where human eyes are less sensitive; and encoding said chrominance data to compressed chrominance data, through fine quantization at regions where human eyes are sensitive, and through coarse quantization at regions where human eyes are less sensitive, and also through reducing the chrominance data word lengths by shortening the chrominance data word lengths when the magnitude of the luminance, as indicated by the luminance data, is above a predetermined first threshold or below a predetermined second threshold, wherein said predetermined first threshold is greater than said predetermined second threshold.
Claim 11
Independent Claim
144 words
A method for compressing color image data including R, G and B data, said method comprising steps of: converting said R, G and B data into luminance data and chrominance data; encoding said luminance data to compressed luminance data, through fine quantization at regions where human eyes are sensitive, and through coarse quantization at regions where human eyes are less sensitive; and encoding said chrominance data to compressed chrominance data, through fine quantization at regions where human eyes are sensitive, and through coarse quantization at regions where human eyes are less sensitive, and also through reducing the chrominance data word lengths by shortening the chrominance data word lengths when the magnitude of the luminance, as indicated by the luminance data, is above a predetermined first threshold or below a predetermined second threshold, wherein said predetermined first threshold is greater than said predetermined second threshold.
References Cited (Backward Citations)
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Cited
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| 7.5 Years (Year 8) | 1999-11-10 | 2000-05-11 | 2000-11-10 | $3760.00 | Window Closed / Lapsed |
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