Abstract: A facsimile apparatus receives standardized video signal, and is capable of transmitting an original image signal read by a scanner and a standardized video image signal in a communication and also capable of easily and rapidly transmitting said video image signal together with the facsimile image.

Abstract: The invention concerns a color image communication apparatus, which comprises scan conversion means for converting n-level image data received in a raster scan system via a communication line to data in a shuttle scan system, multi-level conversion means for converting color n-level data obtained from the scan conversion means for multi-level data, and color conversion means for converting color characteristics of multi-level data obtained from the multi-level conversion means from color characteristics for a communication line to color characteristics of output color recording means.

Abstract: A color image communication apparatus can switch between a copy mode and a communication mode. In the communication mode, color space standardization conversion of objective color image data is performed, while in the copying mode, color space standardization conversion of the objective image data is not performed.

Abstract: An image transmission apparatus includes a color codec section for performing color image coding of a color image, a run-length codec section for performing run-length coding of a monochrome image, and a switching unit for arbitrarily switching the codec sections and to perform coding in units of pages in one communication cycle depending on whether each page is a color image or a monochrome image. Whether each page is constituted by a color image or a monochrome image is set in advance, and corresponding information is stored in a memory. Coding is performed by a coding scheme set for each page, and the coded data is transmitted. Alternatively, coded data obtained by both the codec sections and are stored in a hard disk, and the data coded by a coding scheme which an apparatus at the other end of a communication line can handle is read out and transmitted.

Abstract: It is provided an image communication apparatus which comprises multi-level generation section for generating multi-level data from received image data, color conversion section for color-converting the multi-level data from the multi-level generation section, and setting section for setting a single color mode, in which the received image data is dealt with as single color data irrespective of the color conversion section, when it is determined by communication protocol that the communication mode is the single color mode, so as to ensure satisfactory communication even with a single color image.

Abstract: There is disclosed an image processing apparatus for electrically handling image information, particularly in compressed form, in which the efficiency of memory utilization is improved by storing information of plural pages in successive manner in a memory. Provision is made for ensuring that, if insufficient space is left in the memory for storage of another page of compressed image data, reading of the page in question is interrupted. Once there is again sufficient availability in the memory, the page is re-read, and the read data is compressed and stored.

Abstract: An image data processing apparatus capable of high-speed encoding even for intermittently supplied image data is provided with a memory storing image data, an encoder for encoding the image data and/or a decoder for decoding such encoded information and a transfer unit for DMA transfer of the image data from the memory to the encoder. A supply may be provided for supplying the encoder with the reference signals in synchronization with the DMA transfer of the image data by the transfer unit. The encoding and/or decoding are performed intermittently, e.g., in response to supply of the reference signals.

Abstract: An apparatus for decoding compressed image codes ensures exact synchronization of decoded image signals by differentiating the decoding process in response to the detection of a particular code.

Abstract: An image signal coding apparatus includes reference and coding line change point detection circuits, reference line shift registers, a coding line shift register, a symbol detection circuit, coding and reference line ROM tables, and a code determination circuit. The coding line change point detection circuit receives a serial reference line image signal in synchronism with a serial coding line image signal. The reference line shift registers receive serial change point data in the reference line image signal and output parallel reference line change point data. The coding line shift register receives serial change point data in the coding line image signal and outputs parallel coding line change point data. The symbol detection circuit monitors output states of the reference and coding line shift registers. A run length counter counts the number of pixels between the change points in the coding line image signal.

Abstract: A decoder for two-dimensionally encoded image codes such as modified READ or modified READ codes ensures fast decoding operation by outputting reference codes in parallel while serially discriminating input codes and monitoring the relationship of both codes.