Patent ID: 6925117
Filing Date: 2005-08-02
Classification: H04N

Abstract:
1. A data transmission apparatus comprising: a differential data calculation section for, assuming that data to be a reference is reference data and data to be compared with the reference data is object data, comparing the reference data and the object data to calculate a difference between the object data and the reference data as differential data; a differential data amount reduction section for reducing a transmission data amount of the differential data obtained by said differential data calculation section such that the differential data can be restored; a data transmission section for sending the differential data with a data amount thereof reduced by said differential data amount reduction section; and a reference data ID assignment section for, in the case in which there are a plurality of reference data, assigning an ID number to each reference data, wherein said differential data amount reduction section reduces a data amount of a reference data ID assigned by said reference data ID assignment section together with a data amount of the differential data obtained by said differential data calculation section.