EP0345871A1
Expired / Lapsed
EP
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Device for reproducing digitized video pictures, with inclined plane error restoration
Assignee: Koninklijke Philips NV
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Filing: 1989-05-31
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Granted: —
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Expires: 2009-05-31
Abstract
Abstract 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 corection 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 tne 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 Nicolaas Johan Veldhuis
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 12:32
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; H; H04; H04N; H04N19/00; H04N19/65; H04N19/60
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
158 words
A device for reproducing digitally received video pictures composed of an array of picture elements, said device including a restoration circuit for restoring erroneous picture elements, for which purpose said restoration circuit is adapted to perform a restoration process on the erroneous picture elements located within a reference sub-picture within which said erroneous picture elements are enclosed by non-erroneous picture elements, said restoration process comprising a preset process and an iteration prediction process, characterized in that in the preset process a correction coefficient step is performed in which a correction value dependent on the coordinates of the relevant picture element is subtracted from each non-erroneous picture element of the reference sub-picture for the purpose of generating difference picture elements, said correction values determining an adaptive correction function determined by a plurality of correction function coefficients, the actual values of the correction function coefficients being obtained by minimizing the sum of the square values of the difference picture elements.
Claim 2
Independent Claim
158 words
A device for reproducing digitally received video pictures composed of an array of picture elements, said device including a restoration circuit for restoring erroneous picture elements, for which purpose said restoration circuit is adapted to perform a restoration process on the erroneous picture elements located within a reference sub-picture within which said erroneous picture elements are enclosed by non-erroneous picture elements, said restoration process comprising a preset process and an iteration prediction process, characterized in that in the preset process a correction coefficient step is performed in which a correction value dependent on the coordinates of the relevant picture element is subtracted from each non-erroneous picture element of the reference sub-picture for the purpose of generating difference picture elements, said correction values determining an adaptive correction function determined by a plurality of correction function coefficients, the actual values of the correction function coefficients being obtained by minimizing the sum of the square values of the difference picture elements.
Claim 3
Independent Claim
136 words
A device as claimed in Claim in which the iteration prediction process comprises a coefficient prediction step for determining a set of prediction coefficients for the picture elements of a predetermined prediction field by minimizing a prediction coefficient function; a picture element prediction step for determining, on the basis of the prediction coefficients obtained in the previous coefficient prediction step, restored picture elements by minimizing a picture element function, characterized in that in an adding step a correction value, determined by a given correction function for generating an adapted reference sub-picture, is added to each picture element of a reference sub-picture in which erroneous picture elements are replaced by restored picture elements, said sub-picture being further entirely subjected to the correction coefficient step for re-generating difference picture elements to be subjected to the iteration prediction process.
Claim 4
Dependent Claim
51 words
A device as claimed in Claim 1 or 2, characterized in that the adaptive correction function represents a plane which has a constant value determined by a first correction function coefficient for each picture element within the reference sub-picture and which has an slope determined by two further correction function coefficients.
References Cited (Backward Citations)
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