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公开(公告)号：GB2273414A
公开(公告)日：1994-06-15
申请号：GB9401896
申请日：1994-02-01
Applicant: CANON KK
Inventor： SUGIYAMA MITSUMASA
Abstract: Binary RGB colour image data is converted to multi-bit data by a multiplication/diffusion process 12 (see fig. 6). The look-up table 14 stores RGB data corresponding to CMY data which can be reproduced by the output section 15 and the appropriate CMY data is selected 13 in accordance with the minimum difference between the input image data and the stored image data. The difference or error between the input image data and the reproduceable image data is used in the error diffusion step 12 of neighbouring multibit data. Appropriate CMY data can also be output by selecting the stored RGB data which gives the minimum average of squared errors.
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公开(公告)号：DE69124279D1
公开(公告)日：1997-03-06
申请号：DE69124279
申请日：1991-03-27
Applicant: CANON KK
Inventor： SUGIURA SUSUMU , MITA YOSHINOBU , SHISHIZUKA JUNICHI , TAKAOKA MAKOTO , SHIMOMURA YUKARI , MATSUMOTO KENTARO , UDA TOYOKAZU , SUGIYAMA MITSUMASA , KOBAYASHI SHIGETADA , HISADA KATSUTOSHI , KANEKO YOJI , NAKANISHI HIROYUKI
Abstract: It is provided an image communication apparatus which comprises multi-level generation means for generating multi-level data from received image data, color conversion means for color-converting the multi-level data from the multi-level generation means, and setting means for setting a single color mode, in which the received image data is dealt with as single color data irrespective of the color conversion means, 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.
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公开(公告)号：DE69131260T2
公开(公告)日：1999-11-04
申请号：DE69131260
申请日：1991-03-14
Applicant: CANON KK
Inventor： SUGIYAMA MITSUMASA , KOBAYASHI SHIGETADA
Abstract: According to this invention, when n-value image data is transmitted, data associated with its compression method is transmitted to a reception-side apparatus, so that the reception-side apparatus can perform proper image processing. More specifically, there is disclosed an image transmission method having the following advantages. That is, when a reception-side apparatus can select one of a plurality of image processing methods, it selects a processing method matching with an n-value compression method, and properly reproduces an m-value image. Even when the reception-side apparatus does not have an image processing method matching with the n-value compression method of a transmission-side apparatus, the fact can be informed to the transmission-side apparatus or to an operator of the reception-side apparatus, so that operators of the transmission- and reception-side apparatuses can recognize that a color difference will occur between the transmission- and reception-side apparatuses, and an effective countermeasure can be taken.
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公开(公告)号：DE69131260D1
公开(公告)日：1999-07-01
申请号：DE69131260
申请日：1991-03-14
Applicant: CANON KK
Inventor： SUGIYAMA MITSUMASA , KOBAYASHI SHIGETADA
Abstract: According to this invention, when n-value image data is transmitted, data associated with its compression method is transmitted to a reception-side apparatus, so that the reception-side apparatus can perform proper image processing. More specifically, there is disclosed an image transmission method having the following advantages. That is, when a reception-side apparatus can select one of a plurality of image processing methods, it selects a processing method matching with an n-value compression method, and properly reproduces an m-value image. Even when the reception-side apparatus does not have an image processing method matching with the n-value compression method of a transmission-side apparatus, the fact can be informed to the transmission-side apparatus or to an operator of the reception-side apparatus, so that operators of the transmission- and reception-side apparatuses can recognize that a color difference will occur between the transmission- and reception-side apparatuses, and an effective countermeasure can be taken.
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Patent Agency Ranking
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公开(公告)号：DE4028010A1
公开(公告)日：1991-03-14
申请号：DE4028010
申请日：1990-09-04
Applicant: CANON KK
Inventor： SUGIYAMA MITSUMASA
Abstract: The colour/monochrome picture processor includes a data-bank (1) with binary colour picture information, an integrator circuit (2) with angle/pin cushion correction information, a processor circuit (3) to calculate corrected values, and multiplications, addition and outputs circuits (4,5,6). Each pixel is binary coded with n bits of red/green/blue colour data, and then converted, by addition of correction data, to an m bit data word for subsequent output, m being greater than n.
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