| 摘要 |
An image forming apparatus including an operating board for indicating operating modes, a document reading member and an outputting member for outputting data. An image compressing member compresses image data read by the document reading member and a memory member records the compressed image data, wherein the outputting member produces an output image on a paper sheet based on the compressed image data recorded in the memory member. An image extracting member extracts the compressed data from image data which are obtained by reading the output image by the image reading member and a decompressing member decompresses the compressed image data which are extracted by the image extracting member, wherein the outputting member produces an output image on a paper sheet based on the decompressed image data. With input image data being preserved, the image data are compressed by an image compressing part are thus converted into a cryptograph. The compressed image data are formed by a first image forming part and are output on documents in a form which can not be recognized. In the case of restoration, the output documents which can not be recognized are scanned and the compressed image data are picked up by a compressed image extracting part. The picked up image data are restored into the original image by an image decompressing part, that is, the recognizable image is restored to a usual format on paper sheets by a second image forming part.
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