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公开(公告)号：DE3850029D1
公开(公告)日：1994-07-14
申请号：DE3850029
申请日：1988-09-16
Applicant: IBM
Inventor： ITOH MASAHARU , TOYOKAWA KAZUHARU , YANAGISAWA HIROSHI
Abstract: An original image of a text document is scanned by an image scanner of a resolution of 240 pel/inch in a terminal device. The image scanner generates binary data for each pel of the image sampled at the 240 pel resolution which are stored in a input image buffer. The pel signals are selectively fetched to generate a first compressed data stream 120 pel resolution and a second compressed data stream of the remaining pels. To selectively fetch the pel signals four sampling windows are prepared. The first window fetches one pel signal, as a current pel signal being processed, stored at one of every other pel position and a plurality of neighbouring pel signals stored at the every other pel positions. The sampling points of the first window are arranged at 120 pel resolution. Second, third and fourth sampling windows are used to fetch or sample both pel signals at 120 resolution and the remaining pel signals in various combinations. Patterns of the second, third and fourth windows differ from each other and are arranged at 240 pel resolution.
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公开(公告)号：DE69030279D1
公开(公告)日：1997-04-30
申请号：DE69030279
申请日：1990-04-25
Applicant: IBM
Inventor： ITOH MASAHARU
Abstract: An image processing system for rotating an image comprising an array of picture elements is described. The rotation transformation is decomposed into successive scaling and shearing operations. The scaling operations are performed on one row of picture elements at a time. A preselected point in the scaled row is then sheared, and stored in an output memory. A line generator is used to generate the output memory of addresses of the remaining points in the scaled row.
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公开(公告)号：DE3850029T2
公开(公告)日：1994-12-01
申请号：DE3850029
申请日：1988-09-16
Applicant: IBM
Inventor： ITOH MASAHARU , TOYOKAWA KAZUHARU , YANAGISAWA HIROSHI
Abstract: An original image of a text document is scanned by an image scanner of a resolution of 240 pel/inch in a terminal device. The image scanner generates binary data for each pel of the image sampled at the 240 pel resolution which are stored in a input image buffer. The pel signals are selectively fetched to generate a first compressed data stream 120 pel resolution and a second compressed data stream of the remaining pels. To selectively fetch the pel signals four sampling windows are prepared. The first window fetches one pel signal, as a current pel signal being processed, stored at one of every other pel position and a plurality of neighbouring pel signals stored at the every other pel positions. The sampling points of the first window are arranged at 120 pel resolution. Second, third and fourth sampling windows are used to fetch or sample both pel signals at 120 resolution and the remaining pel signals in various combinations. Patterns of the second, third and fourth windows differ from each other and are arranged at 240 pel resolution.
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Patent Agency Ranking
公开(公告)号：CA2015381C
公开(公告)日：1994-06-07
申请号：CA2015381
申请日：1990-04-25
Applicant: IBM
Inventor： ITOH MASAHARU
Abstract: The disclosure relates to high-speed image processing apparatus and a method for rotating two dimensional original images. Image processing apparatus as described includes a scaling means for responding to scaling values decided by a rotation angle to generate each pel row of a scaled image of the original image; means for responding to values of horizontal and vertical shears decided by the rotation angle to perform horizontal shear and vertical shear operations to generate an address in an output image memory into which the first pel of the pel row of the scaled image is stored; a line generator means for responding to the value of vertical shear and the address of the first pel to generate addresses in the output memory into which all the pels of the pel row of the scaled image are stored; and means for storing all the pels of the pel row in the addresses of the output image memory.
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公开(公告)号：DE3481966D1
公开(公告)日：1990-05-17
申请号：DE3481966
申请日：1984-10-31
Applicant: IBM
Inventor： ITOH MASAHARU , YANAGISAWA HIROSHI , YOKEMURA TAKETOSHI
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公开(公告)号：CA1240789A
公开(公告)日：1988-08-16
申请号：CA467681
申请日：1984-11-13
Applicant: IBM
Inventor： ITOH MASAHARU , YOKEMURA TAKETOSHI , YANAGISAWA HIROSHI
Abstract: An image processing system is characterized in that a plurality of image processing devices having different resolutions are included. An original image to be sent from a selected image processing device is constituted by a base image corresponding to the lowest resolution, and one or more error compensation data corresponding to resolutions changing stepwise from the resolution of the base image to that of the original image. The base image is generated by reducing stepwise the resolution of the original image. The error compensation data is generated by predicting from either a lower resolution image whose resolution is lower than that of the original image, or, the base image, a higher resolution image whose resolution is one step higher, and by encoding error between the predicted image and an actual higher resolution image. When the original image is to be sent to another selected image processing device, image data only up to the one having a resolution of another device are sent.
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公开(公告)号：DE69028866T2
公开(公告)日：1997-04-03
申请号：DE69028866
申请日：1990-03-08
Applicant: IBM
Inventor： ITOH MASAHARU
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公开(公告)号：DE69028866D1
公开(公告)日：1996-11-21
申请号：DE69028866
申请日：1990-03-08
Applicant: IBM
Inventor： ITOH MASAHARU
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