BILDKODIERUNGSSYSTEM.

摘要

Image coding system where document retrieval and printing are compatible, comprises first step of dividing a first image into n x n meshes, second processing step of performing resolution conversion of the divided n x n meshes into one dot and obtaining a second image, third processing step of obtaining first data from the first image excluding all white meshes, and final processing step of decoding the first image from the first data and second image. Since a part of code data of the coded image is also provided with image for retrieval, and the first, second, third and final processing steps are executed, document retrieval image decoding processing for a display device (low resolution device) most requiring high speed and image processing for an image printer requiring resolution rather than high speed are executed in hierarchy, thereby low quality image can be obtained from code data of high quality image. Consequently high compression coding of the high quality image utilized in printer output and the document retrieval at high speed by the low quality image utilizing the display device (low resolution) are compatible, and the low quality image can be utilized in document retrieval or the like at high speed without resolution conversion.