US 4698672
EP 0266049
JP 63148789
Compression LABS hold about 20 EP patents but refrained from enforcing this one against the JPEG format. Now a new proprietor has changed this policy and apparently already squeezed 15 mn USD out of Sony.
EPO Patent 266049- The EPO has granted this patent in 1994 after 7 years of examination, and it was transformed into national patents in Germany, France, Great Britain and Italy. The patent claims a basic principle of coding information.
An ordered redundancy method for coding digital signals, the digital signals taking a plurality of different values, using two types of runlength code (R,R'), the method comprising the steps of
utlising the first type of runlength code (R) for coding a runlength of the most frequently occurring value followed by the next most frequently occurring value;
utilising the second type of runlength code (R') for codinga runlength of the most frequently occurring value followed by any value other than the nextmost frequently occurring value; and
when the second type of runlength code is used, following the runlength code value by a code value indicative of the amplitude of said other value.
Texanisches Unternehmen will Geld für JPEG
The Register: Forgent pursuing JPEG patent against Sony
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