Patent US4807032A successfully refreshed from Google Patents.
US4807032A
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Method of correcting image errors
Assignee: Siemens AG
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Filing: 1988-07-12
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Granted: 1989-02-21
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Expires: 2008-07-12
Abstract
Abstract A method of correcting image errors in the transmission of difference pulse code modulated (DPCM) coded image signals, in which image signal values of only a small number of image lines are intermediately stored at the receiving end, provides an error trail recognition and the replacement of the adulterated image signal values by correction values.
Inventors
- 👤 Herbert Strehl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:22
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/85; H04N19/89; H04N19/895; H04N19/50
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
180 words
A method of correcting image errors in a transmission system in which pulse code modulated image signals are transformed at a transmitting side into difference pulse code modulated image signal values which are transmitted to receiving side, and at the receiving side regained pulse code modulated image signal values, corresponding to said pulse code modulated image signal values, are reconstructed from said difference pulse code modulated image signal values, comprising the steps of: intermediately storing at a receiver said regained pulse code modulated image signal values of a small number of television lines; analyzing the image structure of a television image/television half image from said stored regained pulse code modulated image signal values in order to recognize error trails consisting of adulterated ones of said regained pulse code modulated image signal values caused by adulteration of ones of the transmitted difference pulse code modulated image signal values; and correcting the adulterated ones of the regained pulse code modulated image signal values in said image trail with respective correction values obtained from the transmitted difference pulse code modulated image signal values.
Claim 2
Independent Claim
180 words
A method of correcting image errors in a transmission system in which pulse code modulated image signals are transformed at a transmitting side into difference pulse code modulated image signal values which are transmitted to receiving side, and at the receiving side regained pulse code modulated image signal values, corresponding to said pulse code modulated image signal values, are reconstructed from said difference pulse code modulated image signal values, comprising the steps of: intermediately storing at a receiver said regained pulse code modulated image signal values of a small number of television lines; analyzing the image structure of a television image/television half image from said stored regained pulse code modulated image signal values in order to recognize error trails consisting of adulterated ones of said regained pulse code modulated image signal values caused by adulteration of ones of the transmitted difference pulse code modulated image signal values; and correcting the adulterated ones of the regained pulse code modulated image signal values in said image trail with respective correction values obtained from the transmitted difference pulse code modulated image signal values.
Claim 3
Dependent Claim
35 words
The method of claim 14, wherein the step of analyzing is further defined as: constantly comparing said regained pulse code modulated image signal values within and outside of the geometric structure of an error trail.
Claim 4
Dependent Claim
50 words
The method of claim 14, wherein the step of correcting is further defined as: replacing said adulterated regained pulse code modulated image signal values when a plurality of regained pulse code modulated image signal values adjacent a more greatly adulterated image signal values of a core zone are aprpoximately equal.
Claim 5
Dependent Claim
44 words
The method of claim 14, wherein the step of correcting is further defined as: replacing said adulterated regained pulse code modulated image signal values when a plurality of regained pulse code modulated image signal values adjacent an error trail are unadulterated and approximately equal.
Claim 6
Dependent Claim
29 words
The method of claim 14, and further comprising: calculating said correction values by interpolation from a plurality of regained pulse code modulated image signal values surrounding an error trail.
Claim 7
Dependent Claim
62 words
The method of claim 5, and further defined by: calculating the respective correction values in accordance with the relationship Δs K =1/2a+1/4b+1/4c, where "a" is a difference pulse code modulated image signal value preceding an adulterated difference pulse code modulated image signal value, "c" lies directly above that adulterated difference pulse code modulated image signal value, and "b" precedes the value "c".
Claim 8
Dependent Claim
56 words
The method of claim 1, wherein the step of intermediately storing and the step of analyzing are further defined as: intermediately storing said difference pulse code modulated signal values as said regained pulse code modulated image signal values; and comparing adjacent ones of said stored difference pulse code modulated signal values to recognize said error trail.
Claim 9
Dependent Claim
39 words
The method of claim 6 and further comprising the steps of: identifying an adulterated difference pulse code modulated value which caused said error trail; and replacing the identified adulterated difference pulse code modulated image signal value a correction value.
Claim 10
Dependent Claim
17 words
The method of claim 8, wherein zero is selected as the difference pulse code modulation correction value.
Claim 11
Dependent Claim
30 words
The method of claim 8, and further comprising the step of: interpolating the difference pulse code modulated correction value from an adjacent one of said difference pulse code modulation values.
Claim 12
Dependent Claim
18 words
The method of claim 10, wherein the step of interpolating is further defined as: peforming a loop calculation.
Claim 13
Dependent Claim
28 words
The method of claim 8, and further comprising the step of: interpolating the difference pulse code modulated correction value from the adjacent pulse code modulated image signal values.
Claim 14
Dependent Claim
18 words
The method of claim 12, wherein the step of interpolating is further defined as: performing a loop calculation.
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) | 1992-02-21 | 1992-08-22 | 1993-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-21 | 1996-08-22 | 1997-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-21 | 2000-08-22 | 2001-02-21 | $7700.00 | Window Closed / Lapsed |