公开(公告)号：CA1217266A

公开(公告)日：1987-01-27

申请号：CA426927

申请日：1983-04-28

Applicant: IBM

Inventor： FOX SIDNEY J ,  YESKEL FILIP J ,  ZIMMERMAN WILLIAM J JR

IPC: H04N1/00 ,  G06K9/20 ,  G06T7/00 ,  H04N1/04 ,  H04N1/40 ,  H04N1/403

Abstract: Image processing apparatus and methods adapted for use with a bilevel printer to reproduce mixed format documents including text, halftones and photographs. One image processing apparatus includes an input buffer means for storing pixels. For each pixel of interest, a gradient signal of surrounding pixels is generated. A plurality of signals representative of the previous pixel discrimination decisions is generated. A plurality of reflectance signals representative of the characteristic of pixels downstream from the pixel of interest is determined. A plurality of machine state signals representative of desired reflectance characteristics of a document is stored. A controller correlates the state signals, the history signals, the reflectance signals and the gradient signals to select an optimum thresholder for printing text or photographs. Another image processing apparatus including a "Defocused Symmetry Discriminator" which discriminates line copy information from nonline copy information by an examination of the symmetry characteristics of electronically "defocused" pixel video values, said discriminator being then coupled to the image processing apparatus of the previous paragraph, the result being further coupled to an "Information Homogeneity Discriminator" which makes a final determination of information type based on the homogeneity of information type within a macroscopic area. Another image processing apparatus includes within the apparatus of the first paragraph a "High Frequency Detector/Discriminator" which detects the presence of high frequency information and classifies it as either line copy (e.g. bar codes) or nonline copy (e.g. halftones).

公开(公告)号：CA2007788A1

公开(公告)日：1990-09-17

申请号：CA2007788

申请日：1990-01-15

Applicant: IBM

Inventor： BELL ROGER W ,  EHN DEAN S ,  FOX SIDNEY J ,  GIBSON DAVID K ,  RIES MICHAEL D ,  ROSATI ALFONSO A ,  VELARDE RONALD G

IPC: G03G15/16 ,  G03G15/06 ,  G03G15/044

Abstract: B0989001X ELECTROPHOTOGRAPHIC MACHINE WITH EFFICIENT TRANSFER An electrophotographic machine with a transfer corona generator for producing ionic flow to the backside of print paper to electrostatically attach the paper to the photoreceptive image bearing surface. The machine includes a flexible support member which is movably mounted to mechanically press the print paper against the photoreceptive surface within the transfer zone, preferably at or near the region of peak transfer charge distribution. In that manner, charge from the transfer corona attaches the print paper to the photoreceptive surface at the line of release from the mechanical pressure applied by the flexible support member and thereby eliminates voids in the transfer of toner to print paper caused by air gaps between the paper and the photoreceptive surface.

公开(公告)号：CA1079793A

公开(公告)日：1980-06-17

申请号：CA280312

申请日：1977-06-10

Applicant: IBM

Inventor： FOX SIDNEY J

IPC: B41J2/13 ,  B41J2/01 ,  B41J2/505 ,  G03G21/00 ,  G06K15/10 ,  H04N1/23 ,  G01D15/18 ,  B41J3/04

Abstract: SINGLE ARRAY INK JET PRINTER An ink jet copier is provided with a document scanner which scans a document to be copied one line at a time producing non-coded binary data. The binary data is inserted in storage in a predetermined arrangement. Stored data is removed from selected predetermined locations in accordance with an algorithm and applied to a plurality of ink jet nozzles arranged in multiple linear arrays about the circumference of a rotating paper drum. The data signals selectively applied to the ink jet printers control the deposition of ink on the paper supported on the rotating drum to cause the reproduction of the original scanned image on a predetermined interlaced basis.

公开(公告)号：CA1182554A

公开(公告)日：1985-02-12

申请号：CA392093

申请日：1981-12-11

Applicant: IBM

Inventor： FOX SIDNEY J ,  YESKEL FILIP J ,  ZIMMERMANN WILLIAM J JR

IPC: B41J2/52 ,  G06K9/20 ,  G06T5/00 ,  G06T7/00 ,  H04N1/40 ,  H04N1/403 ,  H04N1/04

Abstract: An image processing apparatus and method adapted for use with a bilevel printer to reproduce mixed format documents including text and photographs. The image processing apparatus includes an input buffer means for storing pixels. For each pixel of interest, a gradient signal of surrounding pixels is generated. A plurality of reflectance signals representative of the characteristics of pixels downstream from the pixel of interest is determined. A plurality of machine state signals representative of desired reflectance characteristics of a document are stored. A controller correlates the state signals, the reflectance signals and the gradient signals to select an optimum thresholder for printing text or photographs.

公开(公告)号：CA1079792A

公开(公告)日：1980-06-17

申请号：CA280278

申请日：1977-06-10

Applicant: IBM

Inventor： FOX SIDNEY J ,  MARTIN VAN C

IPC: B41J2/01 ,  B41J2/13 ,  B41J2/505 ,  G06K15/10 ,  H04N1/195 ,  H04N1/23 ,  B41J3/04 ,  G01D15/16

Abstract: MULTIPLE ARRAY PRINTER An ink jet copier is provided with a document scanner which scans a document to be copied one line at a time producing non-coded binary data. The binary data is inserted in storage in a predetermined arrangement. Stored data is removed from selected predetermined locations in accordance with an algorithm and applied to a plurality of ink jet nozzles arranged in multiple linear arrays about the circumference of a rotating paper drum. The data signals selectively applied to the ink jet printers control the deposition of ink on the paper supported on the rotating drum to cause the reproduction of the original scanned image on a predetermined interlaced basis.

公开(公告)号：CA1079790A

公开(公告)日：1980-06-17

申请号：CA280255

申请日：1977-06-10

Applicant: IBM

Inventor： FOX SIDNEY J ,  MARTIN VAN C ,  VAN HOOK DANNY A

IPC: B41J2/13 ,  B41J2/505 ,  G03G21/00 ,  G06K15/10 ,  H04N1/06 ,  H04N1/195 ,  H04N1/23 ,  H04N1/40 ,  G01D15/16 ,  B41J3/02

Abstract: INK JET COPIER An ink jet copier is provided with a document scanner which scans a document to be copied one line at a time producing non-coded binary data. The binary data is inserted in storage in a predetermined arrangement. Stored data is removed from selected predetermined locations in accordance with an algorithm and applied to a plurality of ink jet nozzles arranged in multiple linear arrays about the circumference of a rotating paper drum. The data signals selectively applied to the ink jet printers control the deposition of ink on the paper supported on the rotating drum to cause the reproduction of the original scanned image on a predetermined interlaced basis.

公开(公告)号：FR2356516A1

公开(公告)日：1978-01-27

申请号：FR7716042

申请日：1977-05-17

Applicant: IBM

Inventor： FOX SIDNEY J ,  MARTIN C VAN ,  HOOK DANNY A VAN

IPC: B41J2/505 ,  G06K15/10 ,  H04N1/06 ,  H04N1/195 ,  B41J3/04 ,  B41J5/44 ,  H04N1/00

Abstract: The ink jet copier is provided with a document scanner which scans a document to be copied one line at a time producing non-coded binary data. The binary data is inserted in storage in a predetermined arrangement. Stored data is removed from selected predetermined locations in accordance with an algorithm and applied to a number of ink jet nozzles arranged in multiple linear arrays about the circumference of a rotating paper drum. The data signals selectively applied to the ink jet printers control the deposition of ink on the paper supported on the rotating drum to cause the reproduction of the original scanned image on a predetermined interlaced basis.