Patent ID: 6587885
Filing Date: 2003-07-01
Classification: H04N,H04Q

Abstract:
A transmission apparatus for fixed length cell handling type image communication wherein image data are transmitted as fixed length cells each including a header part and a data part, comprising:an image data compression section for compressing moving picture data, which define information of a plurality of screens individually divided into a plurality of fields to be transmitted per unit time, for every field serving as a transmission unit using an intra-field compression method for still picture compression to convert the moving picture data into variable length data, which in each field is independent of that in each other field; a transmission buffer section for dividing each piece of the variable length data, which is obtained by said image data compression section, into a plurality of pieces of fixed length data; a fixed length cell transmission section for generating fixed length cells each having a respective piece of said fixed length data as the data part, for transmission to a network and for sending the fixed length cells and residual information, between transmission rate information based on a basic sampling clock representative of a compression of the each field and network clock information of the network, using header parts of predetermined fixed length cells to the network to perform transmission to the network of the moving picture data; wherein each time the still picture compression processing for any field is performed, said image data compression section adjusts a compression ratio for the still picture compression processing so that a compressed image data amount per each unit field of the variable length data obtained is within a predetermined range.