US5552829A
Expired / Lapsed
US
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Image signal coding system
Assignee: Samsung Electronics Co Ltd
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Filing: 1993-02-26
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Granted: 1996-09-03
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Expires: 2013-02-26
Abstract
Abstract An image signal coding system encodes analog image signals into digital signals in a high-definition digital video tape recorder (D-VTR). A scrambling portion rearranges the image data of a frame formated in the order of vertical subsampling line into a predetermined unit of blocks to distribute the highly variable portions and substantially linear portions in the image data uniformly, while an activity calculation portion calculates a horizontal projection sum and a vertical projection sum of discrete coding transform factors in a unit block and a block activity, respectively to determine a coding area and a quantization step size. An adaptive scanning portion adaptively scans the quantized data in accordance with the coding area determined by the activity calculation portion and a sequential transmission portion sequentially transmits the data coded by a variable length coding in conforming with a predetermined transmitting bit rate in a unit of a fixed length, wherein a block having an underflow producted therein is added with 0 and transferred, while a block having an overflow produced therein is transmitted with only an amount of data coincided with the transfer bit rate.
Inventors
- 👤 Kye J. Kim
- 👤 Tae Y. Chung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:08
CPC Classifications
H; H04; H04N; H04N11/00; H04N11/04; H04N11/042; H04N11/044; G; G11; G11B; G11B27/00; G11B27/005; H04N19/00; H04N19/10; H04N19/102; H04N19/124; H04N19/129; H04N19/132; H04N19/134; H04N19/136; H04N19/14; H04N19/146; H04N19/149; H04N19/169; H04N19/17; H04N19/176; H04N19/18; H04N19/48; H04N19/85; H04N19/88; H04N9/00; H04N9/79; H04N9/80; H04N9/804; H04N9/8042; H04N9/8047; G11B2220/00; G11B2220/90
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
335 words
An image signal coding system for coding image signals for a component television which are converted into digital signals, comprising: a data format portion for formatting a ratio of a brightness signal and color difference signals of the image signal in a vertical subsampling line order of 4:2:0. a scrambling means for constructing image data formatted in an order of vertical subsampling line supplied from the data format portion into a predetermined unit of blocks by extracting pixels between flat portions and variable portions thereof, and coding video data for one frame of reconstructed data to distribute a highly variable portion and substantially linear portion in the image data uniformly; a discrete coding transform portion for coding an output from said scrambling means in a predetermined unit of blocks by using a two dimensional discrete cosine transform coding; an activity calculation means for calculating an activity value of the blocks supplied from the discrete coding transform portion to determine a coding area and a quantization step size adaptive to the distribution of frequency for the image data and a scanning pattern of the blocks in accordance with a degree of complexity of the image signal to improve coding efficiency; an adaptive scanning means for adaptively scanning a quantized data field in accordance with the coding area determined by the activity calculation means; an adaptive scanning portion for adaptively scanning the quantized data field in conforming with a coding determined by the activity calculation means; a variable length coding portion for calculating an amount of data produced by applying a variable length coding to an output of the adaptive scanning portion; and a sequential transmission for sequentially transmitting the data coded by a variable length coding in conforming with a predetermined transmitting bit rate in a unit of a fixed length; wherein a block having an underflow produced therein is added with 0 and transferred, while a block having an overflow produced therein is transmitted with an amount of data coincided with the transmitting bit rate.
Claim 2
Dependent Claim
335 words
An image signal coding system for coding image signals for a component television which are converted into digital signals, comprising: a data format portion for formatting a ratio of a brightness signal and color difference signals of the image signal in a vertical subsampling line order of 4:2:0. a scrambling means for constructing image data formatted in an order of vertical subsampling line supplied from the data format portion into a predetermined unit of blocks by extracting pixels between flat portions and variable portions thereof, and coding video data for one frame of reconstructed data to distribute a highly variable portion and substantially linear portion in the image data uniformly; a discrete coding transform portion for coding an output from said scrambling means in a predetermined unit of blocks by using a two dimensional discrete cosine transform coding; an activity calculation means for calculating an activity value of the blocks supplied from the discrete coding transform portion to determine a coding area and a quantization step size adaptive to the distribution of frequency for the image data and a scanning pattern of the blocks in accordance with a degree of complexity of the image signal to improve coding efficiency; an adaptive scanning means for adaptively scanning a quantized data field in accordance with the coding area determined by the activity calculation means; an adaptive scanning portion for adaptively scanning the quantized data field in conforming with a coding determined by the activity calculation means; a variable length coding portion for calculating an amount of data produced by applying a variable length coding to an output of the adaptive scanning portion; and a sequential transmission for sequentially transmitting the data coded by a variable length coding in conforming with a predetermined transmitting bit rate in a unit of a fixed length; wherein a block having an underflow produced therein is added with 0 and transferred, while a block having an overflow produced therein is transmitted with an amount of data coincided with the transmitting bit rate.
Claim 3
Dependent Claim
137 words
An image coding system according to claim 1, wherein the activity calculation means comprises: a primary coding area deciding portion for obtaining a block activity, and a horizontal and vertical projection sum for deciding an area having the horizontal and vertical projection sums corresponding to a predetermined ratio of the block activity as a primary coding area; a quantization step size determining portion for determining portion the quantization step size on the basis of the output of the primary coding area deciding portion; a pseudo-quantization means for quantizing discrete coding transform factors of a unit block conforming with the quantization step size; and a secondary coding area deciding means for deciding an initial area of which the horizontal and vertical projection sums calculated from a high-frequency region of the data quantized through the pseudo-quantization are not 0.
Claim 4
Dependent Claim
39 words
An image coding system according to claim 1 or 2, wherein the activity calculation means sets the quantization step size of a high frequency region to be larger than that of a low frequency region of the image data.
Claim 5
Dependent Claim
71 words
An image coding system according to claim 1, wherein the adaptive scanning portion serves to scan in such a way that when a transverse length of the coding area is longer that a longitudinal length thereof, the adaptive scanning means scans the coding area along a vertical direction, wherein when the transverse length is shorter than the longitudinal length, the adaptive scanning means scans the coding area in a horizontal direction.
Claim 6
Dependent Claim
37 words
An image signal coding system according to claims 1 or 4, wherein the adaptive scanning means scans the coding area in the order of scanning determined on the basis of a statistical value of an actual image.
Claim 7
Dependent Claim
31 words
An image signal coding system according to claim 1 or 2, wherein the activity calculation means determines the quantization step size with a format of an even number of odd number.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-09-03 | 2000-03-04 | 2000-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-09-03 | 2004-03-04 | 2004-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-09-03 | 2008-03-04 | 2008-09-03 | $7700.00 | Window Closed / Lapsed |