Wang Laboratories, Inc.

Prepress Solutions, Inc.

John M Smutek

An Wang

Stanley B Fry

Shu K Ho

Amnon Waisman

John B Ford

Robert I Wenig

Nancy J Webb

A method of preventing Moire patterns in a halftone image includes creating a digital screen including a collection of cells having pixels with threshold values according to a spot function, and dithering the threshold values corresponding with the endtones while not dithering the midtone gray values. Preferably, the amount of dither increases with the difference between the threshold value of the pixels from the midtones. The growth of the spot due to increasing gray values is controlled such that all cells grow at the same rate at the endtone gray values, and some cells grow at different rates at the midtone gray values.

Spot function endtone noise and growth

A management communication terminal is formed by integrating an electronic, raster scanning camera with a personal computer. The terminal has a keyboard, a Winchester disk drive, a telecommunication controller, a cathode ray tube monitor, and a thermographic, raster image printer. Two such terminals define an office information system for the exchange of information produced at the keyboards and by the cameras. In each terminal, the coded data generated at the keyboard and the raster image data generated by the camera are temporarily stored in separate data buffers and from there are routed to the monitor, the printer and disk storage. The monitor and printer are able to display and print respectively, images created from the keyboard data, the camera data or a combination of the two. The camera data is compressed prior to storage and is reduced in resolution prior to application to the monitor. The telecommunication controller, when coupled to a transmission line, transfers keyboard and camera data directly between the disk memories associated with two terminals.

Composite document accessing and processing terminal with graphic and

Management communication terminal system

An improved technique is presented for organizing digitized information for storage in a relational type tree memory structure where the digitized information is broken up into blocks of a fixed byte size which are then stored throughout the memory. A header is utilized which identifies a text or image and details of how the image was digitized and compressed, to be used in reconstructing the image properly. We also utilize an index in which is the image or text identity but also in which is an index identifying the locations throughout memory at which the blocks containing the text or image information is stored. Each block has a header identifying what text or image information is stored in the block and having the address of any another block containing realsted information for the same text or image to thereby create a chaining between the blocks by which they may all be quickly located once a first block is located using the index. A further embodiment of invention allows the storing and display of a base image containing user defined and located subfields and the selective insertion of related data or images, either previously stored or entered by the user, into the subfields. A yet further embodiment allows the use of data contained in the subfields as keys to locate and display further related information.

Image storage and retrieval

Growing community of inventors

Billerica, MA, United States of America

John M Smutek