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US4914745A
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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: 1990-04-03
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Expires: 2008-07-12
Abstract
Abstract A method for correcting image errors in the transmission of DPCM coded image signals provides that an error trail recognition is carried out at the receiving end and that the adulterated image signal values are replaced by already received and intermediately stored image signal values of the preceding television image or television half image.
Inventors
- 👤 Herbert Strehl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:03
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/85; H04N19/89; H04N19/895; H04N19/50
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
135 words
A method of correcting image errors in a transmission of difference pulse code modulated image signal values comprising a television picture, said method comprising the steps of: at a receiver, receiving said difference pulse code modulated image signal values, reconstructing regained image signal values from the received difference pulse code modulated image signal values, said regained image signal values including adulterated image signal values caused by adulteration of some of said difference pulse code modulated image signal values during transmission, and storing the regained image signal values of at least a half image; recognizing error trails in at least said half image of stored regained image signal values, said error trails consisting of adulterated image signal values; and replacing said adulterated image signal values in said error trail with other stored reconstructed image signal values.
Claim 2
Independent Claim
135 words
A method of correcting image errors in a transmission of difference pulse code modulated image signal values comprising a television picture, said method comprising the steps of: at a receiver, receiving said difference pulse code modulated image signal values, reconstructing regained image signal values from the received difference pulse code modulated image signal values, said regained image signal values including adulterated image signal values caused by adulteration of some of said difference pulse code modulated image signal values during transmission, and storing the regained image signal values of at least a half image; recognizing error trails in at least said half image of stored regained image signal values, said error trails consisting of adulterated image signal values; and replacing said adulterated image signal values in said error trail with other stored reconstructed image signal values.
Claim 3
Dependent Claim
105 words
The method of claim 1, wherein said received difference pulse code modulated image signal values comprise a current television picture, wherein difference pulse code modulated image signal values comprising a preceding television picture have already been received and regained image signal values obtained therefrom, and wherein the step of recognizing error trails is defined as: intermediately storing said regained image signal values from at least a half image of said preceding television picture; and comparing said received regained image signal values for said current television picture with corresponding ones of said intermediately stored regained image signal values of said preceding television at least half image.
Claim 4
Dependent Claim
84 words
The method of claim 1, wherein said received difference pulse code modulation image signal values include unadulterated difference pulse code modulation image signal values as well as said adulterated difference pulse code modulation image signal values, and further comprising the steps of: intermediately storing said unadulterated difference pulse code modulation image signal values; and applying said intermediately stored difference pulse code modulation image signal values to a difference pulse code modulation decoder in place of said adulterated difference pulse code modulation image signal values.
Claim 5
Dependent Claim
39 words
The method of claim 1, and further comprising the steps of: storing difference pulse code modulation image signal values of a preceding television at least half image in place of an adulterated difference pulse code modulation image signal value.
Claim 6
Dependent Claim
30 words
The method of claim 1, and further comprising the step of: storing image signal values of a preceding television at least half image in place of adulterated image signal values.
Claim 7
Dependent Claim
61 words
The method of claim 1, wherein said received difference pulse code modulation signal values comprise a complete current television image, and wherein a preceding complete television image has already been transmitted, and wherein the step of replacing is further defined as: intermediately storing said preceding complete television image; and replacing current complete television image by said intermediately stored complete television image.
Claim 8
Dependent Claim
57 words
The method of claim 1, wherein said difference pulse code modulated image signal values comprise a current half image, and wherein a preceding half image has already been transmitted, and wherein the step of replacing is further defined as: intermediately storing said preceding half image; and replacing said current half image with said intermediately stored half image.
Claim 9
Dependent Claim
69 words
The method of claim 1, wherein the step of recognizing said error trails and the step of replacing said adulterated image signal values are further defined as: comparing adulterated image signal values in an error trail with previously stored reconstructed image signal values of corresponding picture elements and replacing said adulterated image signal values only when the image signal values of an error trail are at least virtually unchanged.
Claim 10
Dependent Claim
50 words
The method of claim 1, and further comprising the steps of: obtaining interpolation values from two successive television lines for comparing the adulterated image signal values in an error trail with stored image signal values of a preceding television half image, and storing the interpolated values as image signal values.
Claim 11
Dependent Claim
58 words
The method of claim 9, wherein each error trail includes more heavily adulterated image signal values in a core zone of the error trail, and further defined as: identifying said more heavily adulterated image signal values in each error trail; and replacing only the more heavily adulterated image signal values within a core zone of each error trail.
Claim 12
Dependent Claim
22 words
The method of claim 9, wherein the step of replacing is further defined as: correcting said received adulterated image signal values line-by-line.
Claim 13
Dependent Claim
95 words
The method of claim 1, wherein said received difference pulse code modulated image signal values comprise a current television picture, and wherein difference pulse code modulated image signal values of a preceding television picture have already been received, and wherein the step of recognizing error trails is further defined as: storing received difference pulse code modulated image signal values of said preceding television picture; and comparing said received difference pulse code modulated image signal values for said current television picture with said stored difference pulse code modulated image signal values of said preceding television picture.
Claim 14
Dependent Claim
63 words
The method of claim 1, wherein the step of recognizing error trails is further defined as: interpolating a television at least half image to obtain difference pulse code modulated image signal values and storing the same; and comparing said received difference pulse code modulation image signal values with said stored interpolated difference pulse code modulation image signal values of a preceding half image.
References Cited (Backward Citations)
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