A coding method is presented in this paper for embedding a document into a dithered multi-level image. This method inputs both a monotone image and the related character information converted to binary sequences and it outputs the single dithered image. This image contains the character data of about, 3K bytes in a dithered 3-level image of 256×256 pixels, for example.

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A method for putting the service of telematics communications, such as G3 facsimile and personal computer (PC) data transmission using baseband modem, into practice in digital mobile radio system is proposed. The proposed method allows the subscribers in the mobile stations to use the facsimile/PC terminals connected to the transmitter/receiver set via modular connectors. It is shown that this method considerably improves the data transmission quality as well as the control signal reliability in the telematics communication over that in analog present systems.

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This paper describes a multidimensional color vector quantization method by simultaneous treatment of L*a*b* signals on the uniform color space. In contrast to the previously proposed independent vector quantization method of each L*a*b* signals, required bits/pel can be reduced to about 1/4 or less under the same image qualities.

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Medical images are currently desirable to be filed in optical diks and to form a database. Examples of such systems under study are called PACS (Picture Archiving and Communication System). ISAC (Image Save And Carry) and PHDRS (Personal Health Data Recording system). In this paper, we review them in brief and discuss their possibilities of practical use. Through the discussion, ISAC, that is an off-line system and uses magneto-optical disks, is shown to be a key technology, which leads to a wide use of image processing in medicine. This paper also points out that standerdization of disk and data formats is inevitable for ISAC and that expart systems based on ISAC are almost waiting for development.

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A new mask transfer printing method is developed as a method for direct printing. In this method, the printing sheet consists of an electro-sensitive deposited Al layer, a mat layer, a transparent supporting sheet. a light-to-heat-conversion and gas-generation layer and a heat -sensitive wax ink layer stacked in sequence. Openigs (optical mask) are formed on the A1 film by electroerosion process. Flashlight passing through the openings of the A1 film (optical mask) melts the heat-sensitive ink and transfers it to a paper. Consequently the transfered ink makes an image. Principle,constructions, and characteristics of this method are described. A color printer applied this method is able to print as fast as 2 full-color prints (A4)/min with resolution of 16dot/mm.

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A new recording sheet, which is appliable to mask transfer recording printers, was developed. The features of this sheet are as follows; 1) stable electrosensitive recording is obtained by keeping the surface electric resistance of the A1 deposited layer 0.65±0.10Ω and the surface smoothness 55±10 sec. 2) a clear image is available on a rough paper by applying diazonium salt as a photodecompositing component into the light-heat transforming layer containing carbon black. 3) excellent color printing can be done by inserting a 2μm thickness polyester film between the transforming layer and the ink layer, inwhere the film works to keep the uniform transfer when the transfered color inks were superposed.

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