公开(公告)号：DE3061715D1

公开(公告)日：1983-03-03

申请号：DE3061715

申请日：1980-02-21

Applicant: IBM

Inventor： EDWARDS NATHAN P ,  WHITE JAMES M

IPC: G11C27/04 ,  G06G7/14 ,  H01L21/339 ,  H01L29/76 ,  H01L29/762 ,  H01L29/768 ,  H01L29/772 ,  H03K23/40 ,  H03K23/80 ,  H03K25/00 ,  H01L29/78

Abstract: A circuit is disclosed for obtaining a quantity of electrical charge carriers equal to and representative of the algebraic difference between the values of two original quantities of electrical charge carriers. The circuit includes two charge coupled device input shift registers. Each of the two shift registers incorporates at least three potential well electrodes and interposed transfer electrodes such that charge packets can be shifted from well to well. One potential well in each of the two shift registers is operated in a floating gate electrode mode, and the two potential wells are connected at a common node which services as the input to a third or output charge coupled device shift register. The two original quantities of electrical charge carriers are represented respectively in each of the two input shift registers by a pair of spatially separated charge packets which when sensed by sequencing them into and out of the potential well under the floating gate electrode provide the algebraic value of the associated quantity of electrical charge carriers. By representing each original charge quantity by two spatially separated pairs of charge packets, positive and negative algebraic values may be representing even though all the charge quantities are made up of charge carriers of the same polarity. Combining the two floating gate electrodes at the common node rectifying input to the third or output shift register produces an algebraic value in the output shift register which represents the difference between the original charge packets.

公开(公告)号：CA1216930A

公开(公告)日：1987-01-20

申请号：CA465435

申请日：1984-10-15

Applicant: IBM

Inventor： WHITE JAMES M ,  MAY RONALD W ,  GULLIVER MICHAEL D

IPC: H04N1/40 ,  G06T1/00 ,  H04N1/401 ,  H04N1/38

Abstract: An analog video data signal digitization and correction system scans a medium to produce video data signals representing images printed on the medium. Two reference quantities representing analog reference signals produced by scanning a densely printed image and an area of the medium having no printed image are used to establish the maximum and minimum values of a range of possible values for each video data signal. The analog video data signals are compared with this range and a corrected digital value obtained for each data signal depending on its position in the range. In generating the reference quantities each analog reference signal is converted into a digital reference signal dependent on the position of the analog signal in a range of possible values. For each analog reference signal only a portion of the range of possible values is selected in order to increase the accuracy of the corresponding digital reference signal. The number of bits in the digital reference signal is kept low but the accuracy of each digital reference signal remains high. In converting each digital reference signal into an analog reference quantity additional high order bits are added to the digital reference signal so that each analog reference quantity has the same accuracy as its corresponding digital reference signal.

公开(公告)号：CA1158761A

公开(公告)日：1983-12-13

申请号：CA386394

申请日：1981-09-22

Applicant: IBM

Inventor： MELAMUD ROBERT L ,  NIHART JAMES D ,  WHITE JAMES M

IPC: H04N1/401 ,  G06T1/00 ,  H04N1/403 ,  H04N7/12 ,  H04N7/26 ,  H04N1/02

Abstract: A thresholder for input signals, representing the optical density of elements of a two-dimensional density varying image, wherein transducer means produces series of such input signals, each series corresponding to density variations along a first dimension of the image, and wherein the improvement comprises: information storage means for storing a first reference amount and a plurality of second reference amounts; first means for combining an amount representing one of said input signals with the first reference amount in accordance with a function of the difference therebetween to produce an updated first reference amount and for operatively replacing in the storage means said firs-t reference amount with the updated first reference amount; second means for combining the updated first reference amount with a selected one of the second reference amounts to produce an updated second reference amount as a function of the difference therebetween and for operatively replacing in the storage means the selected one of said second reference amounts with the updated second reference amount; and comparison means for producing a binary output as a function of the relative magnitude of one of the input signal representing amounts and an updated second reference amount. CT9-80-001

公开(公告)号：CA1095753A

公开(公告)日：1981-02-17

申请号：CA287495

申请日：1977-09-26

Applicant: IBM

Inventor： WHITE JAMES M

IPC: H04N3/02 ,  G02B5/32 ,  G02B26/10 ,  G02B27/17

Abstract: FLAT SCAN HOLOGRAPHIC LASER BEAM DEFLECTOR A holographic laser beam deflector has an approximately flat field scan. The scan is produced by illuminating a rotating hologram on a circular surface by a laser beam. The virtual source of the illuminating beam is offset from the center rotation of the hologram. The hologram is produced by interference of a pair of coherent laser beams, each beam having a source or virtual source on a line containing the rotational center of the surface of the hologram, one source or virtual source outside the surface, the other inside. The virtual source for the inside beam is also displaced from the center of rotation.

公开(公告)号：DE3854381T2

公开(公告)日：1996-03-21

申请号：DE3854381

申请日：1988-12-06

Applicant: IBM

Inventor： DINAN RAYMOND F ,  DUBIL JAMES F ,  HILLERY JOHN R ,  RODITE ROBERT R ,  WHITE JAMES M

IPC: G06T3/40 ,  G06T5/00 ,  G06T9/00 ,  H04N1/41 ,  H04N7/24

公开(公告)号：CA1309501C

公开(公告)日：1992-10-27

申请号：CA601790

申请日：1989-06-05

Applicant: IBM

Inventor： DINAN RAYMOND F ,  DUBIL JAMES F ,  HILLERY JOHN R ,  RODITE ROBERT R ,  WHITE JAMES M

IPC: H04N1/41

Abstract: IMAGE PROCESSING SYSTEM AND METHOD EMPLOYING COMBINED BLACK AND WHITE AND GRAY SCALE IMAGE DATA In order to reduce data storage and transmission bandwidth requirements, a high resolution gray scale image is represented in two separate image forms, namely, a high resolution, high sampling density black and white image and a lower resolution, lower sampling density gray scale image. Generating separate black and white and gray scale image data allows the use of either image form independently. The high resolution black and white image data and the low resolution gray scale image data may be recombined subsequently to produce reconstructed high resolution gray scale image data representing the image.

公开(公告)号：FR2413725A1

公开(公告)日：1979-07-27

申请号：FR7834435

申请日：1978-11-30

Applicant: IBM

Inventor： WHITE JAMES M

IPC: G06K7/00 ,  G06K9/60 ,  G06T1/00 ,  H01L31/02 ,  H04N1/04 ,  H04N1/403 ,  G06K9/10

Abstract: An image scanning system which alternately illuminates a charge transfer device with a focused, then defocused image of a line at a time of a document in order to provide comparison signals for binarization of the image concurrent with cancellation of dark current and sensitivity variations. The system includes focus-defocus, variable optical path length optical elements which are operated at a reduced speed by processing a line array at a time instead of a single picture element at a time in the image. A single charge transfer device chip comprises the scanner array, and includes a simple analog line memory comprised of light responsive elements, shift registers, gates, and a 1-bit comparator to perform the binarization. The charge transfer devices may be comprised of charge coupled devices (CCD) or bucket brigade devices (BBD) building blocks.

公开(公告)号：DE3854381D1

公开(公告)日：1995-10-05

申请号：DE3854381

申请日：1988-12-06

Applicant: IBM

Inventor： DINAN RAYMOND F ,  DUBIL JAMES F ,  HILLERY JOHN R ,  RODITE ROBERT R ,  WHITE JAMES M

IPC: G06T3/40 ,  G06T5/00 ,  G06T9/00 ,  H04N1/41 ,  H04N7/24

公开(公告)号：CA1144865A

公开(公告)日：1983-04-19

申请号：CA350475

申请日：1980-04-23

Applicant: IBM

Inventor： PENNINGTON KEITH S ,  SCHLIG EUGENE S ,  WHITE JAMES M

IPC: H04N1/028 ,  H01L27/14 ,  H01L27/148 ,  H04N1/04 ,  H04N1/48 ,  H04N9/04 ,  H04N9/09 ,  H04N1/46

Abstract: A color facsimile transmission apparatus wherein a beam of white light is dispersed into component colors by a prism. The color dispersed bands of illumination are focused to irradiate a portion of a moving document. The reflected, colored light from the document is focused on the surface of three charge coupled devices (CCDs) so that the red illuminating band irradiates a first CCD and the green and blue bands respectively irradiate the second and third CCDs. The movement of the document causes each line of the document to scroll through the illuminating band over each of the CCDs. The CCDs are operated in the time delay and integration mode to generate charge packets corresponding to the picture elements of the red, green and blue component line images of each line of the document. YO978-058

公开(公告)号：FR2396455A1

公开(公告)日：1979-01-26

申请号：FR7818484

申请日：1978-06-13

Applicant: IBM

Inventor： WHITE JAMES M

IPC: H01L21/339 ,  H01L27/105 ,  H01L29/762 ,  H03H15/02 ,  H03H7/00