Patent US4037923A successfully refreshed from Google Patents.
EP0162501A2
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Video signal processing arrangement
Assignee: Philips Electronics UK Ltd
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Filing: 1985-04-18
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Granted: —
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Expires: 2005-04-18
Abstract
Abstract A video signal processing arrangement comprises an input (1) for receiving an input video signal and output (2) at which the processed signal is produced. The arrangement includes a vertical filter (3), a horizontal filter (4), a vertical interpolator (5) a horizontal interpolator (6), a field store (7) and a control circuit (8). The control circuit (8) produces control signals which are fed via paths (20,21,22) to the vertical and horizontal interpolators (5,6) and the field store (7) to reconfigure their positions in the signal processing chain in dependence on whether the television picture represented by the input video signal is to be squeezed or zoomed.
Inventors
- 👤 Atma Heerah
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 16:06
CPC Classifications
G; G06; G06T; G06T3/00; G06T3/40; G06T3/4007; H; H04; H04N; H04N5/00; H04N5/222; H04N5/262; H04N5/2628; H04N7/00; H04N7/01; H04N7/0117; H04N7/0122
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
62 words
A video signal processing arrangement for television signals encoded in digital form comprising a horizontal interpolator, a vertical interpolator, and a field store characterised in that the horizontal and vertical interpolators are individually switchable between the input and output of the field store in dependence on whether the television picture is to be compressed or expanded in the horizontal or vertical direction.
Claim 2
Dependent Claim
62 words
A video signal processing arrangement for television signals encoded in digital form comprising a horizontal interpolator, a vertical interpolator, and a field store characterised in that the horizontal and vertical interpolators are individually switchable between the input and output of the field store in dependence on whether the television picture is to be compressed or expanded in the horizontal or vertical direction.
Claim 3
Dependent Claim
33 words
An arrangeaent as claimed in Claim 1, comprising a horizontal and/or vertical low pass filter for filtering the input video signal before application to the horizontal and vertical interpolator and the field store.
Claim 4
Dependent Claim
33 words
An arrangement as claimed in Claim 2, comprising means for reducing the cut off frequency of the horizontal and/or vertical filter as the picture size is reduced in the horizontal and/or vertical direction.
Claim 5
Dependent Claim
63 words
An arrangesent as claimed in Claim 3, in which the means for reducing the cut-off frequency of the filters comprises a read only memory containing a plurality of sets of filter co-efficients at different memory locations therein and means for addressing the read only memory in dependence on the selected picture size so that the appropriate filter co-efficients are fed to the filters.
Claim 6
Dependent Claim
99 words
An arrangement as claimed in any preceding claim in which the horizontal interpolator, the vertical interpolator, and the store each have a plurality of inputs and outputs, each input being selectably capable of receiving or ignoring information presented, thereto and each output which is connected to the same path as another output being selectively activatable, the arrangement comprising a control circuit for selectively actuating the inputs and outputs of the horizontal interpolator, the vertical interpolator, and the store so that the arrangement is configured in the desired manner in dependence on the setting of a picture size controlling arrangement.
Claim 7
Dependent Claim
27 words
An arrangement as claimed in Claim 5, in which the control circuit comprises a read only memory addressed by signals generated by the picture size controlling arrangement.
Claim 8
Dependent Claim
45 words
An arrangement as claimed in Claim 2 or any preceding claim dependent on Claim 2, comprising means for reducing the cut-off frequecy of the filters below the normally desired frequency for a given picture size so that the sharpness of the displayed picture is impaired.
Claim 9
Dependent Claim
30 words
An arrangement as claimed in Claim 7 when dependent on Claim 4, in which the filter co-efficients corresponding to the lowest cut-off frequency are selected regardless of the picture size.
References Cited (Backward Citations)
No citation records indexed.
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