US4897724A
Expired / Lapsed
US
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Apparatus and method for reproducing digitized video pictures, with inclined plane error restoration
Assignee: US Philips Corp
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Filing: 1988-07-20
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Granted: 1990-01-30
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Expires: 2008-07-20
Abstract
Abstract A device for reproducing digitally presented video pictures includes a restoration circuit for restoring erroneous picture elements. To this end a reference sub-picture is composed of erroneous and correct picture elements, the erroneous picture elements being entirely enclosed by the correct picture elements. Before restoring the erroneous picture elements, a correction function is determined, starting from the correct picture elements of the reference sub-picture, and by means of this correction function a correction value can be determined for each correct picture element in the reference sub-picture such that the difference picture elements obtained by subtracting the associated correction value from each correct picture element represent a signal whose mean value is zero. A known method of restoring erroneous picture elements can now be used for these difference picture elements.
Inventors
- 👤 Raymond N. J. Veldhuis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:32
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; H; H04; H04N; H04N19/00; H04N19/65; H04N19/60
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
141 words
A device for reproducing digitally received video pictures composed of an array of picture elements comprising a reference sub-picture, said device including means for restoring erroneous picture elements located within said reference sub-picture within which said erroneous picture elements are enclosed by non-erroneous picture elements, means for performing a preset process and an iteration prediction process, characterized in that in said preset process a correction coefficient step is performed in which each non-erroneous picture element is reduced by a correction value dependent on the coordinates of the relevant non-erroneous picture element of the reference sub-picture thereby generating a first group of difference picture elements, and wherein said correction values are determined by a plurality of correction function coefficients, the actual values of which are obtained by minimizing the sum of the square values of said first group of difference picture elements.
Claim 2
Independent Claim
141 words
A device for reproducing digitally received video pictures composed of an array of picture elements comprising a reference sub-picture, said device including means for restoring erroneous picture elements located within said reference sub-picture within which said erroneous picture elements are enclosed by non-erroneous picture elements, means for performing a preset process and an iteration prediction process, characterized in that in said preset process a correction coefficient step is performed in which each non-erroneous picture element is reduced by a correction value dependent on the coordinates of the relevant non-erroneous picture element of the reference sub-picture thereby generating a first group of difference picture elements, and wherein said correction values are determined by a plurality of correction function coefficients, the actual values of which are obtained by minimizing the sum of the square values of said first group of difference picture elements.
Claim 3
Dependent Claim
134 words
A device as claimed in claim 1 in which said iteration prediction process comprises a coefficient prediction step for determining a set of prediction coefficients for a plurality of picture elements of a predetermined prediction field by minimizing a prediction coefficient function; a picture element prediction step for determining, on the basis of said prediction coefficients, a plurality of restored picture elements by minimizing a picture element function; and an adding step whereby said correction value is determined by an adaptive correction function and is added to each picture element of said reference sub-picture in which erroneous picture elements are replaced by said restored picture elements, said reference sub-picture being further subjected to said correction coefficient step for re-generating a further group of difference picture elements to be subjected to said iteration prediction process.
Claim 4
Dependent Claim
49 words
A device as claimed in claim 2, characterized in that said adaptive correction function represents a plane which has a constant value determined by a first correction function coefficient for each picture element within said reference sub-picture and which has a slope determined by two further correction function coefficients.
Claim 5
Dependent Claim
28 words
A device as claimed in claim 1, in which said iteration prediction process comprises an adding step whereby said correction value is determined by an adaptive correction function.
Claim 6
Dependent Claim
49 words
A device as claimed in claim 4, characterized in that said adaptive correction function represents a plane which has a constant value determined by a first correction function coefficient for each picture element within said reference sub-picture and which has a slope determined by two further correction function coefficients.
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) | 1993-01-29 | 1993-07-31 | 1994-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-29 | 1997-07-31 | 1998-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-29 | 2001-07-31 | 2002-01-30 | $7700.00 | Window Closed / Lapsed |