Abstract: A moving image coding apparatus comprises: an intraframe coding circuit for carrying out band compression of moving image data by intraframe coding; an interframe coding circuit for carrying out band compression of moving image data by interframe coding; a block division circuit for dividing data in each frame into a plurality of blocks each of which includes a predetermined number of pixels; and a coding switch circuit for switching a coding operation which is carried out in the coder, so that coding is carried out by the intraframe coding circuit for moving image data of a predetermined portion of pixels in each of the plurality of blocks, and coding is carried out by the interframe coding circuit for moving image data of a remaining portion of pixels in each of the plurality of blocks.

Abstract: An image data coding system, wherein an image data in a bit map form is divided into first and second groups, pixels in each group of which are distributed over the whole area of the image data in the bit map form. First and second coders respectively code the first and second groups of image data into first and second groups of coded image data. The first and second groups of image data in the original image data are respectively input into first and second memories, respectively. Blocks of the first group of image data are supplied to the first coder at first times, respectively, and blocks of the second group of image data are supplied to the second coder at second times, respectively. Boundaries of the blocks in the first group of image data are located in different positions from boundaries of the blocks in the second group of image data, and the first times are different from the second times.

Abstract: A picture data communication system with a scanning pattern change includes a plurality of scanning pattern selecting units responsive to input picture signals for selecting a type of scanning pattern, a plurality of difference encoding and quantizing units responsive to the outputs of the scanning pattern selecting units for encoding and quantizing differences between data in adjacent frames in a sequence of frames for pixels and quantizing the encoded difference data.