William K Stelzenmuller from 7505 Carpenter Fire Station Rd, Cary, NC 27519, age 83, Phone: (919) 467-3096

Resumes

William Stelzenmuller

Publications

Us Patents

Enhancement Of Video Images By Selective Introduction Of Gray-Scale Pels

US Patent:

44867859, Dec 4, 1984

Filed:

Sep 30, 1982

Appl. No.:

6/429382

Inventors:

Dana A. Lasher - Raleigh NC
William K. Stelzenmuller - Morrisville NC

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H04N 140

US Classification:

358284

Abstract:

A technique for enhancing a displayed image originally stored at a density of 1 data bit per pel. The stored data is scanned to locate unit steps, one-row or one-column steps in binary values. Whenever a unit step is found, the distance from the step to the nearest transitions on both sides of the step are found. The distances are used to access lookup tables which assign 4 bit gray scale values to limited numbers of pels on both sides of the unit step. The assigned gray scale values produce a gradually-darkening string of pels extending through the step. When the entire image field has been scanned, a maximum 4 bit pel value is assigned to any unmodified pel having an original binary value of 1 and a minimum pel value is assigned to any unmodified pel having an original binary value of 0. The visual quality of the displayed image is enhanced by the selective introduction of intermediate gray scale values for pels adjacent unit steps.

Method For Reducing Line Width Variations In Bilevel Video Images

US Patent:

45176043, May 14, 1985

Filed:

Apr 4, 1983

Appl. No.:

6/481610

Inventors:

Dana A. Lasher - Raleigh NC
William K. Stelzenmuller - Morrisville NC

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H04N 141
H04N 140

US Classification:

358262

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 row to 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.

Method Of Spatially Thresholding A Discrete Color Image

US Patent:

46739777, Jun 16, 1987

Filed:

Jun 20, 1985

Appl. No.:

6/747094

Inventors:

William K. Stelzenmuller - Morrisville NC

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H04N 712
H04N 100
G06K 936

US Classification:

358133

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 histogram 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.

Videos & Images