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JPEGs are not free: Patent holder pursues IP grab

http://www.theregister.co.uk/content/4/26272.html


JPEGs are not free: Patent holder pursues IP grab

By Andrew Orlowski in London

Posted: 18/07/2002 at 16:34 GMT

A video conferencing company based in Austin, Texas says it's going to pursue royalties on the transmission of JPEG images.

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Dieser Bericht verlinkt folgendes US-Patent:

US 4,698,672 A Filed: October 27, 1986

1. A method for processing digital signals, where the digital signals have first values, second values and other values, to reduce the amount of data utilized to represent the digital signals and to form statistically coded signals such that the more frequently occurring values of digital signals are represented by shorter code lengths and the less frequently occurring values of digital signals are represented by longer code lengths, comprising,

forming first runlength code values representing the number of consecutive first values of said digital signals followed by said second value,

forming second runlength code values representing the number of consecutive first values of said digital signals followed by one of said other values.

[...]

6. A method for processing input signals to reduce the amount of data utilized to represent the input signals, the steps comprising,

processing the input signals to form processed signals where the processed signals are digital numbers having first values, second values, and other values,

coding each digital number to form statistically coded signals such that the more frequently occurring values in the digital numbers are represented by shorter code lengths and the less frequently occurring values of coded signals are represented by longer code lengths, said coding including,

forming first runlength code values representing the number of consecutive first values followed by said second value in a digital number,

forming second runlength code values representing the number of consecutive first values followed by one of said other values in the digital number.

[...]

12. A method for processing digital signals, where the digital signals have first values, second values and other values, where the processing reduces the amount of data utilized to represent the digital signals and where the processing forms statistically coded signals such that the more frequently occurring values of digital signals are represented by shorter code lengths and the less frequently occurring values of digital signals are represented by longer code lengths, comprising,

forming a first code value representing a set of said first values followed by said second value,

forming a second code value representing a set of said first values followed by one or more of said other values.

13. A method for processing digital signals to reduce the amount of data utilized to represent the digital signals, the steps comprising, processing the digital signals to form processed signals where the processed signals are multivalued digital numbers and have first values, second values, . . . , j-values, (j+1)-values, . . . , n- values for j ranging from 1 to n, and have other values,

coding said processed signals to form statistically coded signals such that the more frequently occurring values of the processed signals are represented by shorter code lengths and the less frequently occurring values of coded signals are represented by longer code lengths, said coding including,

forming j.sup.th runlength code values representing the number of consecutive processed signals of said first value followed by said j+1 value, for each value of j from 1 to n,

forming additional runlength code values representing the number of consecutive processed signals of said first value followed by any of said other values.

[...]

25. An apparatus for processing digital signals, where the digital signals have first values, second values and other values, to reduce the amount of data utilized to represent the digital signals and to form statistically coded signals such that the more frequently occurring values of digital signals are represented by shorter code lengths and the less frequently occurring values of digital signals are represented by longer code lengths, comprising,

means for forming first runlength code values representing the number of consecutive first values of said digital signals followed by said second value,

means for forming second runlength code values representing the number of consecutive first values of said digital signals followed by one of said other values.

[...]

30. An apparatus for processing input signals to reduce the amount of data utilized to represent the input signals, the apparatus comprising,

means for processing the input signals to form processed signals where the processed signals are digital numbers having first values, second values, and other values,

means for coding each digital number to form statistically coded signals such that the more frequently occurring values in the digital numbers are represented by shorter code lengths and the less frequently occurring values in the digital numbers are represented by longer code lengths, said means for coding including,

means for forming first runlength code values representing the number of consecutive first values followed by said second value in a digital number,

means for forming second runlength code values representing the number of consecutive first values followed by one of said other values in the digital number.

[...]

38. A method for processing digital signals, where the digital signals have first values, second values and other values, where the processing reduces the amount of data utilized to represent the digital signals and where the processing forms statistically coded signals such that the more frequently occurring values of digital signals are represented by shorter code lengths and the less frequently occurring values of digital signals are represented by longer code lengths, where

a first code value is formed representing a set of said first values followed by said second value,

a second code value is formed representing a set of said first values followed by one or more of said other values

comprising,

decoding said first code value to form a set of said first values followed by said second value,

decoding said second code value to form a set of said first values followed by one or more of said other values.

39. A method for processing digital signals to reduce the amount of data utilized to represent the digital signals, the steps comprising, processing the digital signals to form processed signals where the processed signals are multivalued digital numbers and have first values, second values, . . . , j-values, (j+1)-values, . . . , n- values for j ranging from 1 to n, and have other values,

coding said processed signals to form statistically coded signals such that the more frequently occurring values of the processed signals are represented by shorter code lengths and the less frequently occurring values of coded signals are represented by longer code lengths, said coding including,

forming j.sup.th runlength code values representing the number of consecutive processed signals of said first value followed by said j+1 value, for each value of j from 1 to n,

forming additional runlength code values representing the number of consecutive processed signals of said first value followed by any of said other values

transmitting said j.sup.th runlength code values and said additional runlength code values to a receiver to form received signal including received j.sup.th runlength code values and received additional runlength code values,

decoding said received signals to form decoded signals, said decoding including,

decoding said received j.sup.th runlength code values to form a number of consecutive decoded signals of said first value followed by said j+1 value, for each value of j from 1 to n,

decoding said received additional runlength code values to form a number of consecutive decoded signals of said first value followed by any of said other values.

42. An apparatus for processing input signals to reduce the amount of data utilized to represent the input signals, the apparatus comprising,

means for processing the input signals to form processed signals where the processed signals are digital numbers having first values, second values, and other values,

means for coding each digital number to form statistically coded signals such that the more frequently occurring values in the digital numbers are represented by shorter code lengths and the less frequently occurring values in the digital numbers are represented by longer code lengths, said means for coding including,

means for forming first runlength code values representing the number of consecutive first values followed by said second value in a digital number,

means for forming second runlength code values representing the number of consecutive first values followed by one of said other values in the digital number,

means for transmitting said j.sup.th runlength code values and said additional runlength code values to a receiver to form received signal including received j.sup.th runlength code values and received additional runlength code values,

means for decoding said received signals to form decoded signals, said means for decoding including,

means for decoding said received j.sup.th runlength code values to form a number of consecutive decoded signals of said first value followed by said j+1 value, for each value of j from 1 to n,

means for decoding said received additional runlength code values to form a number of consecutive decoded signals of said first value followed by any of said other values.

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