scope:

Introduction

In this amendment, the following new materials are added:

a) new clauses 9, 10, and 11 to describe the required architecture and procedures for JBIG2 encoding; and

b) a new Annex J to document optional JBIG2 encoding methods.

The encoding procedures in clauses 9 and 10 are essentially the inverse of the decoding procedures already described in clauses 6 and 7 of ITU-T Rec. T.88 | ISO/IEC 14492. To simplify the required new documentation, description of each of the encoding procedures is given by referring to the corresponding decoding procedures in clauses 6 and 7, wherever applicable. Clause 11 and Annex J, however, are new material and thus contain more detailed documentation. In clause 11 (although the encoding complements that of clause 8 of ITU-T Rec. T.88 | ISO/IEC 14492), JBIG2 encoding architecture as well as its technical components are described, and their corresponding implementation methods are given by reference. In J.1, compliant example encoding methods are summarized in table form.