Image compressing apparatus

An image compressing apparatus has a predictive coding unit, an orthogonal transform unit, a quantization unit, a variable length coding unit, a coding control unit and a start decision unit. The start decision unit receives predictive errors from the predictive coding unit and a quantization parame...

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Bibliographic Details
Main Author KAWAHARA; KENJI
Format Patent
LanguageEnglish
Published 06.02.1996
Edition6
Subjects
BASIC ELECTRONIC CIRCUITRY
CALCULATING
CODE CONVERSION IN GENERAL
CODING
COMPUTING
COUNTING
DECODING
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Summary:An image compressing apparatus has a predictive coding unit, an orthogonal transform unit, a quantization unit, a variable length coding unit, a coding control unit and a start decision unit. The start decision unit receives predictive errors from the predictive coding unit and a quantization parameter from the coding control unit to produce a start control signal. The start control signal is set to a logic value 1 if the orthogonal transform unit, the quantization unit and the variable length coding unit are to be activated, and to a logic value 0 if they are not to be activated. The orthogonal transform unit, the quantization unit and the variable length coding unit are activated with the logic value 1 to perform respective processes, and are kept unactivated with the logic value 0. The image compressing apparatus is low in power dissipation and short in processing time.
Bibliography:Application Number: US19940215411