Facsimile and static presentation processing – Facsimile – Auxiliary signal
Patent
1987-11-09
1990-04-24
Groody, James J.
Facsimile and static presentation processing
Facsimile
Auxiliary signal
358133, 358430, H04N 1415, H04N 1413
Patent
active
049204262
ABSTRACT:
In an image coding system having a plurality of coding characteristics, such as quantization characteristics, information of a digital image signal sequence is monitored in each of a number of predetermined intervals by forming a histogram of a sequence of coefficients which is calculated from the digital image signal sequence in accordance with each of the coding characteristics. The amount of information is calculated by summing up the coefficients in relation to every one of the coding characteristics. An optimum one of the coding characteristics is indicated by the coding control circuit to code the coefficient sequence into a sequence of coded signals in accordance with the optimum coding characteristic. The coefficient sequence in each frame may be divided into a sequence of blocks each of which is judged to be either valid or invalid in relation to each coding characteristic. Results of judgement may be included in the amount of information.
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Hatori Yoshinori
Koga Toshio
Matsuda Kiichi
Mukawa Naoki
Fujitsu Limited
Groody James J.
Kokusai Denshin Denwa Co. Ltd.
NEC Corporation
Nippon Telegraph and Telephone Corporation
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