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1.发明公开
公开(公告)号：EP0205944A2
公开(公告)日：1986-12-30
申请号：EP86107009
申请日：1986-05-23
Applicant: IBM
Inventor： STELZENMULLER WILLIAM KARL
CPC classification number: H04N19/93
Abstract: A method is disclosed for thresholding the luminance component of color picture elements (pels) prior to compression. The method is most effective when used with discrete color images, such as documents having areas of nominally constant color. The method uses spatial information rather than histrog- ram information to threshold the image data. Each scan line is defined as having a series of pel runs. A pel is considered to be in a run if its luminance is within a certain range of an average luminance based on preceding pels. Each run may end in a transition region wherein the luminance of each pel differs from the luminance of the preceding pel by more than a predetermined amount. Where a transition region is found, a local threshold is set based on the average luminance of the preceding run and of the following pel. All pels in the transition region are assigned a luminance value equal either to the average luminance of the preceding run or the actual luminance of the following pel.
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公开(公告)号：DE2541770A1
公开(公告)日：1976-07-15
申请号：DE2541770
申请日：1975-09-19
Applicant: IBM
Inventor： STELZENMULLER WILLIAM KARL , WALKER ERNEST LEE
Abstract: An acoustical wave filter is formed by depositing a pattern of interdigitated conductors which form a coding arrangement on a piezeoelectric crystal. Multiplex communication through the crystal is achieved by depositing input filters of differing configuration on the crystals, which separate channels by autocorrelation of a pulse code. A single output filter is provided to respond to the waves set up in the crystal by the input filters to transmit these waves to a single common conductor. Demultiplex is similarly done on a second crystal.
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公开(公告)号：DE2422549A1
公开(公告)日：1975-01-23
申请号：DE2422549
申请日：1974-05-09
Applicant: IBM
IPC: H03K19/195 , H03K19/02
Abstract: A logical OR circuit using Josephson tunnelling devices is provided having a first, second and third gate. Each of the gates includes a first and second branch circuit in parallel. A first Josephson tunnelling device is located in the first branch circuit and a second Josephson tunnelling device is located in the second branch of each of said first, second and third gates. A DC current is applied to each of the first, second and third gates. A control means provides the logic inputs to each of the first and second Josephson devices in each of said gates to cause the selected devices to switch to their finite voltage state causing the input current to flow in the other one of the first and second branch circuits. First sensing means connected in series are located between the first branches of the first, second and third gates which response to the current flow in one or both of the first branches of the first and second gates to provide a sensing current pulse to the control means for the Josephson tunnelling junction in the second branch of the third gate switching it into its finite voltage state thereby causing the current to flow through the opposite branch in the third gate representing current flow in one or more of the first branches of the first and second gates representing an OR function. Second sensing means connected in parallel are located between the second branches of the first, second and third gates which respond to the current flow in the second branch of both the first and second gates to provide an input to the control means for the first Josephson device of the third gate causing it to switch to its finite voltage stage thereby causing the input current to the third gate to flow through the opposite branch thereof.
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Patent Agency Ranking
公开(公告)号：DE3670939D1
公开(公告)日：1990-06-07
申请号：DE3670939
申请日：1986-05-23
Applicant: IBM
Inventor： STELZENMULLER WILLIAM KARL
Abstract: A method is disclosed for thresholding the luminance component of color picture elements (pels) prior to compression. The method is most effective when used with discrete color images, such as documents having areas of nominally constant color. The method uses spatial information rather than histrog- ram information to threshold the image data. Each scan line is defined as having a series of pel runs. A pel is considered to be in a run if its luminance is within a certain range of an average luminance based on preceding pels. Each run may end in a transition region wherein the luminance of each pel differs from the luminance of the preceding pel by more than a predetermined amount. Where a transition region is found, a local threshold is set based on the average luminance of the preceding run and of the following pel. All pels in the transition region are assigned a luminance value equal either to the average luminance of the preceding run or the actual luminance of the following pel.
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公开(公告)号：DE3381217D1
公开(公告)日：1990-03-15
申请号：DE3381217
申请日：1983-07-29
Applicant: IBM
Inventor： LASHER DANA ALFRED , STELZENMULLER WILLIAM KARL
Abstract: The present invention is a method for reducing the visual impact of stepped edges by the selective introduction of gray-scale pels before the image is displayed, in a system capable of receiving and storing non-coded binary image pel values in a direction transverse to the direction of the successive lines. The stored data is modified by assigning gray scale values to a limited number of pels on opposite sides of each identified unit step to create a string of gradually changing gray scale values extending through each identified unit step. Fixed gray scale values are assigned to any pels not previously modified to establish upper and lower limits on gray scale pel values. The displayed image is generated in accordance with the assigned gray scale pel values. The selective introduction of gray scale pels at the identified unit steps has the effect of smoothing the image in the area of the unit steps without blurring the remainder of the character.
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公开(公告)号：DE3467965D1
公开(公告)日：1988-01-14
申请号：DE3467965
申请日：1984-02-29
Applicant: IBM
Inventor： LASHER DANA ALFRED , STELZENMULLER WILLIAM KARL
Abstract: For use in a teleconference system, a method of reducing line width variations, which are assumed to be the result of undersampling of the original image. Bilevel data received at a remote site is written into a pair of two-dimensional storage arrays. Data stored in the first array is examined row by rowto identify different length-dependent classes of black horizontal pel runs. White or black pels in the second array are overwritten with gray pels at specific pel locations as a function of run length to reduce variations in length. The first array data is then examined on a column by column basis. Black vertical runs are classified and the second array is overwritten with gray pels using the same rules as were applied to horizontal runs. The trilevel second array data may be used to drive a display monitor or may first be subjected to further image processing.
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公开(公告)号：DE2619964A1
公开(公告)日：1976-11-25
申请号：DE2619964
申请日：1976-05-06
Applicant: IBM
Inventor： GINDI ABRAHAM , HONG JU-HI JOHN , STELZENMULLER WILLIAM KARL , POUGHKEEPSIE N Y
IPC: H03M5/12 , H03K5/00 , H03L7/00 , H04J3/06 , H04L5/22 , H04L7/00 , H04L7/033 , H04L25/40 , H04L25/49 , H04Q11/04 , H04L25/08 , H03K13/01
Abstract: An improved clock retiming system for pulse coded data is provided in which the clock signals are extracted from the encoded data and first and second signals of the same amplitude and frequency but of different phase are generated from the clock signals. First and second amplifiers having variable gains provide amplification for the first and second signals, respectively. The first and second amplified signals are summed to produce a third signal having a phase which is a function of the relative amplitudes of the first and second amplified signals. The original pulse encoded data is sampled with the third signal to produce the retimed data output. The original pulse encoded data is also utilized to sample the third signal. The resulting signal is filtered to provide a DC voltage feedback error signal indicative of the phase difference between the third signal and the original pulse encoded data. This feedback signal is translated into a pair of complementary signals forming inputs to the first and second amplifiers, respectively, to vary the variable gains thereof, oppositely thereby adjusting the phase of the third signal to correspond to the phase of the original pulse encoded data.
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公开(公告)号：DE2424808A1
公开(公告)日：1975-01-23
申请号：DE2424808
申请日：1974-05-22
Applicant: IBM
Abstract: A two-phase superconductive shift register using Josephson tunnelling devices is provided wherein a plurality of shift register stages each includes a first and second branch in parallel to which a DC current is supplied. A Josephson tunnelling device is located in each branch which operates in its no voltage state when the DC current is applied thereto. A first and second input means is provided for switching one of the Josephson tunnelling devices in accordance with an input to cause the input current to flow through the other branch. A first and second coupling means are located between the stages of the shift register, the first coupling means coupling the first branch circuits of successive stages and the second coupling means coupling second branch circuits of successive stages. The coupling means are energized in response to phase time pulses and current flow in the preceding stage causing the Josephson device in the next stage to switch to its finite voltage stage thereby causing the current to flow in the opposite branch in the next stage.
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