Method of decoding coded image data utilizing transmission error detection to interrupt decoding and up-dating
First Claim
1. In a method for decoding and utilizing coded image data from a received data stream, particularly for the transmission of sequences of moving images, wherein the image date are coded according to a coding method employing residual redundancy and the data stream includes unequivocally associatable starting code words for a frame or fields, said method including the steps of decoding the image data to provide reconstructed pixel values, and up-dating the contents of a predicted-image memory on the basis of the reconstructed pixel values obtained form said step of decoding;
- the improvement comprising;
following detection of one of said starting code words, constantly checking said data stream, utilizing said residual redundancy of said image data, for the occurrence of a transmission error; and
, upon the detection of a transmission error, interrupting said step of up-dating, and no longer utilizing said reconstructed pixel values to bring the predicted-image memory up to date, until a new starting code word appears for the frame or field.
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Abstract
A method of decoding coded image data, preferably coded according to CCITT Recommendsation H. 261, wherein the data stream is continuously monitored for transmission errors by utilizing the residual redundancy of the data stream, and pixel values reconstructed after the detection of a transmission error are not entered into the predicted-image memory until a subsequent starting code word for a frame or field has appeared.
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Citations
18 Claims
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1. In a method for decoding and utilizing coded image data from a received data stream, particularly for the transmission of sequences of moving images, wherein the image date are coded according to a coding method employing residual redundancy and the data stream includes unequivocally associatable starting code words for a frame or fields, said method including the steps of decoding the image data to provide reconstructed pixel values, and up-dating the contents of a predicted-image memory on the basis of the reconstructed pixel values obtained form said step of decoding;
- the improvement comprising;
following detection of one of said starting code words, constantly checking said data stream, utilizing said residual redundancy of said image data, for the occurrence of a transmission error; and
, upon the detection of a transmission error, interrupting said step of up-dating, and no longer utilizing said reconstructed pixel values to bring the predicted-image memory up to date, until a new starting code word appears for the frame or field. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- the improvement comprising;
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14. In a method for decoding and utilizing coded image data from a received data stream, particularly for the transmission of sequences of moving images, wherein the image data are coded according to a coding method employing residual redundancy and the data stream includes unequivocally associatable starting code words for a frame or fields, said method including the steps of decoding the image data to provide reconstructed pixel values, adding the reconstructed pixel values obtained from said step of decoding to the output of a predicted-image memory to provide a digital video signal, and up-dating the contents of the predicted image memory with the digital video signal;
- the improvement comprising;
following detection of one of said starting code words, continuously checking said data stream, utilizing said residual redundancy of said image data, for the occurrence of a transmission error; and
, upon the detection of a said transmission error, immediately interrupting said steps of adding and up-dating until a new starting code word is detected for a frame or field. - View Dependent Claims (15, 16, 17, 18)
- the improvement comprising;
Specification